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Park H, Kang M, Lee D, Park J, Kang SJ, Kang B. Activating reversible carbonate reactions in Nasicon solid electrolyte-based Na-air battery via in-situ formed catholyte. Nat Commun 2024; 15:2952. [PMID: 38580640 PMCID: PMC10997774 DOI: 10.1038/s41467-024-47415-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Accepted: 04/02/2024] [Indexed: 04/07/2024] Open
Abstract
Out of practicality, ambient air rather than oxygen is preferred as a fuel in electrochemical systems, but CO2 and H2O present in air cause severe irreversible reactions, such as the formation of carbonates and hydroxides, which typically degrades performance. Herein, we report on a Na-air battery enabled by a reversible carbonate reaction (Na2CO3·xH2O, x = 0 or 1) in Nasicon solid electrolyte (Na3Zr2Si2PO12) that delivers a much higher discharge potential of 3.4 V than other metal-air batteries resulting in high energy density and achieves > 86 % energy efficiency at 0.1 mA cm-2 over 100 cycles. This cell design takes advantage of moisture in ambient air to form an in-situ catholyte via the deliquescent property of NaOH. As a result, not only reversible electrochemical reaction of Na2CO3·xH2O is activated but also its kinetics is facilitated. Our results demonstrate the reversible use of free ambient air as a fuel, enabled by the reversible electrochemical reaction of carbonates with a solid electrolyte.
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Affiliation(s)
- Heetaek Park
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongamro, Namgu, Pohang, Gyeongbuk, 37673, South Korea
| | - Minseok Kang
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongamro, Namgu, Pohang, Gyeongbuk, 37673, South Korea
| | - Donghun Lee
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongamro, Namgu, Pohang, Gyeongbuk, 37673, South Korea
| | - Jaehyun Park
- Department of Energy Engineering School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil, Ulsan, 44919, South Korea
| | - Seok Ju Kang
- Department of Energy Engineering School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil, Ulsan, 44919, South Korea
| | - Byoungwoo Kang
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongamro, Namgu, Pohang, Gyeongbuk, 37673, South Korea.
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2
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Baek K, Lee WG, Im E, Ha JH, Ahn S, Kim Y, Choi Y, Kang SJ. Gradient Lithium Metal Infusion in Ag-Decorated Carbon Fibers for High-Capacity Lithium Metal Battery Anodes. Nano Lett 2023; 23:8515-8523. [PMID: 37669534 DOI: 10.1021/acs.nanolett.3c02229] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/07/2023]
Abstract
Lithium (Li) metal is a promising anode material for high-energy-density Li batteries due to its high specific capacity. However, the uneven deposition of Li metal causes significant volume expansion and safety concerns. Here, we investigate the impact of a gradient-infused Li-metal anode using silver (Ag)-decorated carbonized cellulose fibers (Ag@CC) as a three-dimensional (3D) current collector. The loading level of the gradient-infused Li-metal anode is controlled by the thermal infusion time of molten Li. In particular, a 5 s infusion time in the Ag@CC current collector creates an appropriate space with a lithiophilic surface, resulting in improved cycling stability and a reduced volume expansion rate. Moreover, integrating a 5 s Ag@CC anode with a high-capacity cathode demonstrates superior electrochemical performance with minimal volume expansion. This suggests that a gradient-infused Li-metal anode using Ag@CC as a 3D current collector represents a novel design strategy for Li-metal-based high-capacity Li-ion batteries.
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Affiliation(s)
- Kyungeun Baek
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Wang-Geun Lee
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Eunmi Im
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
- Institute of Energy and Climate Research-Fundamental Electrochemistry (IEK-9), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - Jee Ho Ha
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Seokhoon Ahn
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Jeonbuk 55324, Republic of Korea
| | - Youngsik Kim
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Yeonsik Choi
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Seok Ju Kang
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
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3
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Jung Y, Lee S, Kim D, Park J, Kang SJ, Kim Y, Park JS, Lee WG. Reversible Na Plating/Stripping with High Areal Capacity Using an Electroconductive Liquid Electrolyte System. ACS Appl Mater Interfaces 2023; 15:43656-43666. [PMID: 37672801 DOI: 10.1021/acsami.3c06554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
Anode-free sodium-metal batteries (AFSMBs) are promising candidates for maximizing energy density and minimizing cost and safety hazards in the absence of metallic sodium during cell assembly. The practical implementation of AFSMBs is hindered by the low cycling stability of Na-metal plating and stripping, particularly under high areal capacities, due to unstable solid electrolyte interphase (SEI) layer formation with electrolyte decomposition and inactive dead Na formation. Here, we proposed an electroconductive electrolyte system consisting of liquid electrolytes that accept electrons at a certain energy level and form electronically conductive and solid electrolytes that prevent internal short circuit through low electronic conductivity. The electron acceptability and high electronic conductivity of the liquid electrolyte can suppress the irreversible electron transfer with electrolyte decomposition and reutilize the inactive dead metal, respectively. The functions of the system were demonstrated using a sodium biphenyl liquid electrolyte-NASICON solid electrolyte in a seawater battery (SWB) system, which features an infinite sodium source. The anode-free SWB cells achieved a high Coulombic efficiency of ≥99.9% for over 60 cycles at a high areal capacity of ∼24 mAh/cm2. This study provides insight into the Na plating/stripping properties in anode-free systems and proposes a significant strategy for improving the reversibility of metal anodes for various battery systems with solid electrolytes.
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Affiliation(s)
- Youngjae Jung
- School of Energy & Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea
| | - Seyoung Lee
- School of Energy & Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea
| | - Dowan Kim
- School of Energy & Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea
| | - Jaehyun Park
- School of Energy & Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea
| | - Seok Ju Kang
- School of Energy & Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea
| | - Youngsik Kim
- School of Energy & Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea
- R&D Center, 4TOONE Corporation, UNIST-gil 50, Ulsan 44919, Republic of Korea
| | - Jeong-Sun Park
- R&D Center, 4TOONE Corporation, UNIST-gil 50, Ulsan 44919, Republic of Korea
| | - Wang-Geun Lee
- School of Energy & Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea
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Song C, Moon H, Baek K, Shin C, Lee K, Kang SJ, Choi NS. Acid- and Gas-Scavenging Electrolyte Additive Improving the Electrochemical Reversibility of Ni-Rich Cathodes in Li-Ion Batteries. ACS Appl Mater Interfaces 2023; 15:22157-22166. [PMID: 37126475 DOI: 10.1021/acsami.3c02231] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
In view of their high theoretical capacities, nickel-rich layered oxides are promising cathode materials for high-energy Li-ion batteries. However, the practical applications of these oxides are hindered by transition metal dissolution, microcracking, and gas/reactive compound formation due to the undesired reactions of residual lithium species. Herein, we show that the interfacial degradation of the LiNi0.9CoxMnyAlzO2 (NCMA, x + y + z = 0.1) cathode and the graphite (Gr) anode of a representative Li-ion battery by HF can be hindered by supplementing the electrolyte with tert-butyldimethylsilyl glycidyl ether (tBS-GE). The silyl ether moiety of tBS-GE scavenges HF and PF5, thus stabilizing the interfacial layers on both electrodes, while the epoxide moiety reacts with CO2 released by the parasitic reaction between HF and Li2CO3 on the NCMA surface to afford cyclic carbonates and thus suppresses battery swelling. NCMA/Gr full cells fabricated by supplementing the baseline electrolyte with 0.1 wt % tBS-GE feature an increased capacity retention of 85.5% and deliver a high discharge capacity of 162.9 mAh/g after 500 cycles at 1 C and 25 °C. Thus, our results reveal that the molecular aspect-based design of electrolyte additives can be efficiently used to eliminate reactive species and gas components from Li-ion batteries and increase their performance.
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Affiliation(s)
- Chaeeun Song
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Hyeongyu Moon
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Kyungeun Baek
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Chorong Shin
- LG Energy Solution, 188 Munji-ro, Yuseong-gu, Daejeon 34122, Republic of Korea
| | - Kwansoo Lee
- LG Energy Solution, 188 Munji-ro, Yuseong-gu, Daejeon 34122, Republic of Korea
| | - Seok Ju Kang
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Nam-Soon Choi
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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Lee E, Wi TU, Park J, Park SW, Kim MH, Lee DH, Park BC, Jo C, Malik R, Lee JH, Shin TJ, Kang SJ, Lee HW, Lee J, Seo DH. Nanocomposite Engineering of a High-Capacity Partially Ordered Cathode for Li-Ion Batteries. Adv Mater 2023; 35:e2208423. [PMID: 36600458 DOI: 10.1002/adma.202208423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 11/11/2022] [Indexed: 06/17/2023]
Abstract
Understanding the local cation order in the crystal structure and its correlation with electrochemical performances has advanced the development of high-energy Mn-rich cathode materials for Li-ion batteries, notably Li- and Mn-rich layered cathodes (LMR, e.g., Li1.2 Ni0.13 Mn0.54 Co0.13 O2 ) that are considered as nanocomposite layered materials with C2/m Li2 MnO3 -type medium-range order (MRO). Moreover, the Li-transport rate in high-capacity Mn-based disordered rock-salt (DRX) cathodes (e.g., Li1.2 Mn0.4 Ti0.4 O2 ) is found to be influenced by the short-range order of cations, underlining the importance of engineering the local cation order in designing high-energy materials. Herein, the nanocomposite is revealed, with a heterogeneous nature (like MRO found in LMR) of ultrahigh-capacity partially ordered cathodes (e.g., Li1.68 Mn1.6 O3.7 F0.3 ) made of distinct domains of spinel-, DRX- and layered-like phases, contrary to conventional single-phase DRX cathodes. This multi-scale understanding of ordering informs engineering the nanocomposite material via Ti doping, altering the intra-particle characteristics to increase the content of the rock-salt phase and heterogeneity within a particle. This strategy markedly improves the reversibility of both Mn- and O-redox processes to enhance the cycling stability of the partially ordered DRX cathodes (nearly ≈30% improvement of capacity retention). This work sheds light on the importance of nanocomposite engineering to develop ultrahigh-performance, low-cost Li-ion cathode materials.
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Affiliation(s)
- Eunryeol Lee
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-Gil, Ulsan, 44919, Republic of Korea
| | - Tae-Ung Wi
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-Gil, Ulsan, 44919, Republic of Korea
| | - Jaehyun Park
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-Gil, Ulsan, 44919, Republic of Korea
| | - Sang-Wook Park
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-Gil, Ulsan, 44919, Republic of Korea
| | - Min-Ho Kim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-Gil, Ulsan, 44919, Republic of Korea
| | - Dae-Hyung Lee
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-Gil, Ulsan, 44919, Republic of Korea
| | - Byung-Chun Park
- LG Energy Solution R&D Campus Daejeon, 188, Munji-ro, Yuseong-gu, Daejeon, 34122, Republic of Korea
| | - Chiho Jo
- LG Energy Solution R&D Campus Daejeon, 188, Munji-ro, Yuseong-gu, Daejeon, 34122, Republic of Korea
| | - Rahul Malik
- Office of Energy Research and Development, Natural Resources Canada, Ottawa, ON, K1A 0E4, Canada
| | - Jong Hoon Lee
- UNIST Central Research Facilities (UCRF), UNIST, Ulsan, 44919, Republic of Korea
| | - Tae Joo Shin
- Graduate School of Semiconductor Materials and Devices Engineering & UNIST Central Research Facilities, UNIST, 50 UNIST-Gil, Ulsan, 44919, Republic of Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-Gil, Ulsan, 44919, Republic of Korea
| | - Hyun-Wook Lee
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-Gil, Ulsan, 44919, Republic of Korea
| | - Jinhyuk Lee
- Department of Mining and Materials Engineering, McGill University, Montreal, QC, H3A 0C5, Canada
| | - Dong-Hwa Seo
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-Gil, Ulsan, 44919, Republic of Korea
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6
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Son M, Park J, Im E, Ryu JH, Durmus YE, Eichel RA, Kang SJ. Sacrificial Catalyst of Carbothermal-Shock-Synthesized 1T-MoS 2 Layers for Ultralong-Lifespan Seawater Battery. Nano Lett 2023; 23:344-352. [PMID: 36574277 DOI: 10.1021/acs.nanolett.2c04698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
A Pt-nanoparticle-decorated 1T-MoS2 layer is designed as a sacrificial electrocatalyst by carbothermal shock (CTS) treatment to improve the energy efficiency and lifespan of seawater batteries. The phase transition of MoS2 crystals from 2H to metallic 1T─induced by the simple but potent CTS treatment─improves the oxygen-reduction-reaction (ORR) activity in seawater catholyte. In particular, the MoS2-based sacrificial catalyst effectively decreases the overpotential during charging via edge oxidation of MoS2, enhancing the cycling stability of the seawater battery. Furthermore, Pt nanoparticles are deposited onto CTS-MoS2 via an additional CTS treatment. The resulting specimen exhibits a significantly low charge/discharge potential gap of Δ0.39 V, high power density of 6.56 mW cm-2, and remarkable cycling stability up to ∼200 cycles (∼800 h). Thus, the novel strategy reported herein for the preparation of Pt-decorated 1T-MoS2 by CTS treatment could facilitate the development of efficient bifunctional electrocatalysts for fabricating seawater batteries with long service life.
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Affiliation(s)
- Minjin Son
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Jaehyun Park
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Eunmi Im
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Jong Hun Ryu
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Yasin Emre Durmus
- Institute of Energy and Climate Research-Fundamental Electrochemistry (IEK-9), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - Rüdiger-A Eichel
- Institute of Energy and Climate Research-Fundamental Electrochemistry (IEK-9), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
- Institut für Materialien und Prozesse für elektrochemische Energiespeicher-undwandler, RWTH Aachen University, D-52074 Aachen, Germany
| | - Seok Ju Kang
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
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7
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Kim Y, Thangam R, Yoo J, Heo J, Park JY, Kang N, Lee S, Yoon J, Mun KR, Kang M, Min S, Kim SY, Son S, Kim J, Hong H, Bae G, Kim K, Lee S, Yang L, Lee JY, Kim J, Park S, Kim DH, Lee KB, Jang WY, Kim BH, Paulmurugan R, Cho SW, Song HC, Kang SJ, Sun W, Zhu Y, Lee J, Kim HJ, Jang HS, Kim JS, Khademhosseini A, Kim Y, Kim S, Kang H. Photoswitchable Microgels for Dynamic Macrophage Modulation. Adv Mater 2022; 34:e2205498. [PMID: 36268986 DOI: 10.1002/adma.202205498] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 09/22/2022] [Indexed: 06/16/2023]
Abstract
Dynamic manipulation of supramolecular self-assembled structures is achieved irreversibly or under non-physiological conditions, thereby limiting their biomedical, environmental, and catalysis applicability. In this study, microgels composed of azobenzene derivatives stacked via π-cation and π-π interactions are developed that are electrostatically stabilized with Arg-Gly-Asp (RGD)-bearing anionic polymers. Lateral swelling of RGD-bearing microgels occurs via cis-azobenzene formation mediated by near-infrared-light-upconverted ultraviolet light, which disrupts intermolecular interactions on the visible-light-absorbing upconversion-nanoparticle-coated materials. Real-time imaging and molecular dynamics simulations demonstrate the deswelling of RGD-bearing microgels via visible-light-mediated trans-azobenzene formation. Near-infrared light can induce in situ swelling of RGD-bearing microgels to increase RGD availability and trigger release of loaded interleukin-4, which facilitates the adhesion structure assembly linked with pro-regenerative polarization of host macrophages. In contrast, visible light can induce deswelling of RGD-bearing microgels to decrease RGD availability that suppresses macrophage adhesion that yields pro-inflammatory polarization. These microgels exhibit high stability and non-toxicity. Versatile use of ligands and protein delivery can offer cytocompatible and photoswitchable manipulability of diverse host cells.
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Affiliation(s)
- Yuri Kim
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Ramar Thangam
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
- Institute for High Technology Materials and Devices, Korea University, Seoul, 02841, Republic of Korea
| | - Jounghyun Yoo
- Chemical and Biological Integrative Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
| | - Jeongyun Heo
- Chemical and Biological Integrative Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
| | - Jung Yeon Park
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea
| | - Nayeon Kang
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Sungkyu Lee
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Jiwon Yoon
- Chemical and Biological Integrative Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
| | - Kwang Rok Mun
- Materials Architecturing Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
| | - Misun Kang
- Materials Architecturing Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
| | - Sunhong Min
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Seong Yeol Kim
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Subin Son
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Jihwan Kim
- Chemical and Biological Integrative Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea
| | - Hyunsik Hong
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Gunhyu Bae
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Kanghyeon Kim
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Sanghyeok Lee
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Letao Yang
- Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ, 08854, USA
| | - Ja Yeon Lee
- Materials Architecturing Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
| | - Jinjoo Kim
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90024, USA
| | - Steve Park
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Dong-Hyun Kim
- Department of Radiology, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA
| | - Ki-Bum Lee
- Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ, 08854, USA
| | - Woo Young Jang
- Department of Orthopedic Surgery, Korea University Anam Hospital, Seoul, 02841, Republic of Korea
| | - Bong Hoon Kim
- Daegu Gyeongbuk Institute of Science and Technology (DGIST), Department of Robotics and Mechatronics Engineering, Daegu, 42988, Republic of Korea
| | - Ramasamy Paulmurugan
- Department of Radiology, Molecular Imaging Program at Stanford, Stanford University School of Medicine, Stanford University, Palo Alto, CA, 94304, USA
- Department of Radiology, Canary Center at Stanford for Cancer Early Detection, Stanford University School of Medicine, Stanford University, Palo Alto, CA, 94304, USA
| | - Seung-Woo Cho
- Department of Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea
- Center for Nanomedicine, Institute for Basic Science (IBS), Seoul, 03722, Republic of Korea
| | - Hyun-Cheol Song
- Electronic Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
- KIST-SKKU Carbon-Neutral Research Center, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Wujin Sun
- Department of Biological Systems Engineering, Virginia Tech, Blacksburg, VA, 24061, USA
| | - Yangzhi Zhu
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90024, USA
| | - Junmin Lee
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Han-Jun Kim
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90024, USA
| | - Ho Seong Jang
- Materials Architecturing Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
- Division of Nano & Information Technology, KIST School, Korea University of Science and Technology (UST), Seoul, 02792, Republic of Korea
| | - Jong Seung Kim
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Ali Khademhosseini
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90024, USA
| | - Yongju Kim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea
| | - Sehoon Kim
- Chemical and Biological Integrative Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea
| | - Heemin Kang
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
- College of Medicine, Korea University, Seoul, 02841, Republic of Korea
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8
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Moon J, Kang SJ, Noh JW. Evaluation of primary health care system in Yangon Region, Myanmar: a mixed-method approach. Eur J Public Health 2022. [DOI: 10.1093/eurpub/ckac131.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Many low- and middle-income countries and international organizations have invested resources to strengthen primary health care services. Despite efforts from the Ministry of Health on primary health care, barriers to accessing health care services and health inequality in Myanmar still exist. This study aimed to identify the challenges and unmet needs in the current primary health care services by assessing the experiences and perceptions of healthcare workers and local leaders in three townships (Htantabin, Hmawbi, and Taikkyi) in Yangon, Myanmar.
Methods
The study was conducted among healthcare professionals and community leaders in three townships. By adopting a mixed-method approach, a cross-sectional health needs assessment survey was conducted for quantitative data (n = 66), and focus group discussions (15 group discussions) were conducted online for qualitative data.
Results
As a result of the survey regarding six domains; hygiene, primary medical care, maternal and child health, infectious diseases, non-communicable diseases, and leadership, enhancing the management and leadership capacity had the lowest average score on the current achievement (2.81 out of 5), while strengthening infectious disease control service and accessibility was perceived as the highest mean on the priority of intervention (4.28 out of 5) and the impact of the intervention (4.7). The focus group discussions revealed that while specific infrastructures and equipment necessary for the category were addressed, the need for financial support has been the recurrent theme throughout the discussions.
Conclusions
Utilizing the World Health Organization’s six-building block framework, our findings suggest that a long-term targeted financial investment in the primary health care system is critical in Myanmar by increasing health care expenditure per capita. At the same time, related barriers and facilitators should be considered to optimize the effectiveness of prioritized interventions.
Key messages
• Health care providers and local leaders perceived the management and leadership capacity as the lowest current achievement.
• A long-term targeted financial investment in the primary health care system is critical in Myanmar.
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Affiliation(s)
- J Moon
- Graduate School of Medical Sciences, University of Groningen , Groningen, Netherlands
| | - SJ Kang
- Institute of Health and Environment, Seoul National University , Seoul, South Korea
| | - JW Noh
- Division of Health Administration, Yonsei University , Wonju, South Korea
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9
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Seo SM, Kim SJ, Kwon O, Brilakis ES, Yoon YH, Lee KS, Kim TO, Lee PH, Kang SJ, Kim YH, Lee CW, Park SW, Lee SW. Intravascular ultrasound-guided optimization for chronic total occlusion-percutaneous coronary intervention with multiple drug-eluting stents. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.2071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Multiple stenting in the chronic total occlusion (CTO) lesions is frequently required, however associated with poorer clinical outcomes. It is demonstrated that intravascular ultrasound (IVUS)-guided CTO-percutaneous coronary intervention (PCI) is related to a lower risk of adverse clinical events.
Purpose
We aimed to evaluate the clinical impact of stent optimization under IVUS guidance for multiple stenting, comparing with single stenting.
Methods
A total of 916 patients receiving drug-eluting stent (DES) under IVUS guidance were classified into two groups (stent optimization and non-optimization) according to optimization criteria (an absolute expansion criteria; minimal stent area ≥4.9 mm2 and a relative expansion criteria; 80% of mean reference lumen area). Of total population, 314 patients (34.3%) were treated with single stent and 575 patients (62.7%) were treated with multiple stents, respectively. Ischemic-driven target-lesion revascularization (TLR)/reocclusion was evaluated.
Results
Under IVUS guidance, 316 patients (34.5%) met IVUS criteria for stent optimization The achieving rates were 53% in the single stent group and 24% in the multiple stents group, respectively, (p<0.001). During a median of 4.7 years, the multiple stent group showed a significantly higher TLR/reocclusion rate, compared with the single stent group (12.8% vs. 5.2%, adjusted hazard ratio [HR] 2.51, 95% confidence interval [CI] 1.20–5.25, p=0.01). (Figure 1) Meeting both the absolute and relative expansion criteria was associated with a significantly low rate of TLR/reocclusion rate (12.5% vs. 5.2%, adjusted HR 0.34, 95% CI: 0.15–0.79, p=0.01). Under IVUS-guidance, there was no significant difference between multiple stenting and single stenting in case of achieving the optimization criteria (6.5% vs. 4.2%, p=0.11), whereas non-optimization group in the patients with multiple stenting showed a significantly higher rate of TLR/reocclusion, compared with IVUS-optimization group in the patients with single stenting (14.5% vs. 4.2%, p=0.002). (Figure 2)
Conclusions
In CTO-PCI with DES, multiple stenting significantly increased the risk of TLR/reocclusion. IVUS-guided optimization for multiple stenting showed a comparable long-term risk of TLR/reocclusion to single stenting with IVUS optimization. Hence, achieving IVUS expansion criteria may help to reduce the risk of TLR/reocclusion in CTO-PCI with multiple DES overlapping.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- S M Seo
- Eunpyeoung St. Mary's Hospital, Division of Cardiology, Department of Internal Medicine , Seoul , Korea (Republic of)
| | - S J Kim
- Eunpyeoung St. Mary's Hospital, Division of Cardiology, Department of Internal Medicine , Seoul , Korea (Republic of)
| | - O Kwon
- Eunpyeoung St. Mary's Hospital, Division of Cardiology, Department of Internal Medicine , Seoul , Korea (Republic of)
| | - E S Brilakis
- Minneapolis Heart Institute Foundation , Minneapolis , United States of America
| | - Y H Yoon
- Sejong Chungnam National University Hospital , Sejong , Korea (Republic of)
| | - K S Lee
- Daejeon St. Mary's Hospital , Daejeon , Korea (Republic of)
| | - T O Kim
- Asan Medical Center , Seoul , Korea (Republic of)
| | - P H Lee
- Asan Medical Center , Seoul , Korea (Republic of)
| | - S J Kang
- Asan Medical Center , Seoul , Korea (Republic of)
| | - Y H Kim
- Asan Medical Center , Seoul , Korea (Republic of)
| | - C W Lee
- Asan Medical Center , Seoul , Korea (Republic of)
| | - S W Park
- Asan Medical Center , Seoul , Korea (Republic of)
| | - S W Lee
- Asan Medical Center , Seoul , Korea (Republic of)
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10
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Kim J, Jeong J, Jung GY, Lee J, Lee JE, Baek K, Kang SJ, Kwak SK, Hwang C, Song HK. Amphi-Active Superoxide-Solvating Charge Redox Mediator for Highly Stable Lithium-Oxygen Batteries. ACS Appl Mater Interfaces 2022; 14:40793-40800. [PMID: 36044267 DOI: 10.1021/acsami.2c07400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
A multifunctional electrolyte additive for lithium oxygen batteries (LOBs) was designed to have (1) a redox-active moiety to mediate decomposition of lithium peroxide (Li2O2 as the final discharge product) during charging and (2) a solvent moiety to solvate and stabilize lithium superoxide (LiO2 as the intermediate discharge product) in electrolyte during discharging. 4-Acetamido-TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidin-1-yl)oxyl) or AAT was employed as the additive working for both charge and discharge processes (amphi-active). The redox-active moiety was rooted in TEMPO, while the acetamido (AA) functional group inherited the high donor number (DN) of N,N-dimethylacetamide (DMAc). Integrating two functional moieties (TEMPO and AA) into a single molecule resulted in the bifunctionality of AAT (1) facilitating Li2O2 decomposition by the TEMPO moiety and (2) encouraging the solvent mechanism of Li2O2 formation by the high-DN AA moiety. Significantly improved LOB performances were achieved by the superoxide-solvating charge redox mediator, which were not obtained by a simple cocktail of TEMPO and DMAc.
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Affiliation(s)
- Jonghak Kim
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Jinhyeon Jeong
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Gwan Yeong Jung
- Department of Mechanical Engineering & Materials Science, Washington University in St. Louis, St. Louis, Missouri 63130 United States
| | - Jeongin Lee
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Ji Eun Lee
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Kyungeun Baek
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Sang Kyu Kwak
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Chihyun Hwang
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Hyun-Kon Song
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
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11
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Eum D, Kim B, Song JH, Park H, Jang HY, Kim SJ, Cho SP, Lee MH, Heo JH, Park J, Ko Y, Park SK, Kim J, Oh K, Kim DH, Kang SJ, Kang K. Coupling structural evolution and oxygen-redox electrochemistry in layered transition metal oxides. Nat Mater 2022; 21:664-672. [PMID: 35301474 DOI: 10.1038/s41563-022-01209-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 01/24/2022] [Indexed: 06/14/2023]
Abstract
Lattice oxygen redox offers an unexplored way to access superior electrochemical properties of transition metal oxides (TMOs) for rechargeable batteries. However, the reaction is often accompanied by unfavourable structural transformations and persistent electrochemical degradation, thereby precluding the practical application of this strategy. Here we explore the close interplay between the local structural change and oxygen electrochemistry during short- and long-term battery operation for layered TMOs. The substantially distinct evolution of the oxygen-redox activity and reversibility are demonstrated to stem from the different cation-migration mechanisms during the dynamic de/intercalation process. We show that the π stabilization on the oxygen oxidation initially aids in the reversibility of the oxygen redox and is predominant in the absence of cation migrations; however, the π-interacting oxygen is gradually replaced by σ-interacting oxygen that triggers the formation of O-O dimers and structural destabilization as cycling progresses. More importantly, it is revealed that the distinct cation-migration paths available in the layered TMOs govern the conversion kinetics from π to σ interactions. These findings constitute a step forward in unravelling the correlation between the local structural evolution and the reversibility of oxygen electrochemistry and provide guidance for further development of oxygen-redox layered electrode materials.
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Affiliation(s)
- Donggun Eum
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul National University, Seoul, Republic of Korea
| | - Byunghoon Kim
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul National University, Seoul, Republic of Korea
| | - Jun-Hyuk Song
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea
| | - Hyeokjun Park
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea
| | - Ho-Young Jang
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea
| | - Sung Joo Kim
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea
| | - Sung-Pyo Cho
- National Center for Inter-University Research Facilities, Seoul National University, Seoul, Republic of Korea
| | - Myeong Hwan Lee
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul National University, Seoul, Republic of Korea
| | - Jae Hoon Heo
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea
| | - Jaehyun Park
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
| | - Youngmin Ko
- Lawrence Berekely National Laboratory, Berekely, CA, USA
| | - Sung Kwan Park
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea
| | - Jinsoo Kim
- Ulsan Advanced Energy Technology R&D Center, Korea Institute of Energy Research, Ulsan, Republic of Korea
| | - Kyungbae Oh
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul National University, Seoul, Republic of Korea
| | - Do-Hoon Kim
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul National University, Seoul, Republic of Korea
| | - Seok Ju Kang
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
| | - Kisuk Kang
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea.
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul National University, Seoul, Republic of Korea.
- Institute of Engineering Research, College of Engineering, Seoul National University, Seoul, Republic of Korea.
- School of Chemical and Biological Engineering, College of Engineering, Seoul National University, Seoul, Republic of Korea.
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12
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Lee JB, Kim GH, Jeon JH, Jeong SY, Lee S, Park J, Lee D, Kwon Y, Seo JK, Chun JH, Kang SJ, Choe W, Rohde JU, Hong SY. Rapid access to polycyclic N-heteroarenes from unactivated, simple azines via a base-promoted Minisci-type annulation. Nat Commun 2022; 13:2421. [PMID: 35504905 PMCID: PMC9065069 DOI: 10.1038/s41467-022-30086-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Accepted: 04/11/2022] [Indexed: 11/27/2022] Open
Abstract
Conventional synthetic methods to yield polycyclic heteroarenes have largely relied on metal-mediated arylation reactions requiring pre-functionalised substrates. However, the functionalisation of unactivated azines has been restricted because of their intrinsic low reactivity. Herein, we report a transition-metal-free, radical relay π-extension approach to produce N-doped polycyclic aromatic compounds directly from simple azines and cyclic iodonium salts. Mechanistic and electron paramagnetic resonance studies provide evidence for the in situ generation of organic electron donors, while chemical trapping and electrochemical experiments implicate an iodanyl radical intermediate serving as a formal biaryl radical equivalent. This intermediate, formed by one-electron reduction of the cyclic iodonium salt, acts as the key intermediate driving the Minisci-type arylation reaction. The synthetic utility of this radical-based annulative π-extension method is highlighted by the preparation of an N-doped heptacyclic nanographene fragment through fourfold C–H arylation. The functionalisation of unactivated azines has been restricted because of their intrinsic low reactivity. Here the authors show a transition-metal-free, radical relay π-extension approach to produce N-doped polycyclic aromatic compounds directly from simple azines and cyclic iodonium salts.
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Affiliation(s)
- Jae Bin Lee
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Gun Ha Kim
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Ji Hwan Jeon
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Seo Yeong Jeong
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Soochan Lee
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Jaehyun Park
- School of Energy and Chemical Engineering, UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Doyoung Lee
- School of Energy and Chemical Engineering, UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Youngkook Kwon
- School of Energy and Chemical Engineering, UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Jeong Kon Seo
- UNIST Central Research Facilities (UCRF), UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Joong-Hyun Chun
- Department of Nuclear Medicine, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Wonyoung Choe
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Jan-Uwe Rohde
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea.
| | - Sung You Hong
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea.
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13
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Hwang C, Kwak MJ, Jeong J, Baek K, Yoon KY, An C, Min JW, Kim J, Lee J, Kang SJ, Jang JH, Song HK. Critical Void Dimension of Carbon Frameworks to Accommodate Insoluble Products of Lithium-Oxygen Batteries. ACS Appl Mater Interfaces 2022; 14:492-501. [PMID: 34932302 DOI: 10.1021/acsami.1c14859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
High-energy density lithium-oxygen batteries (LOBs) seriously suffer from poor rate capability and cyclability due to the slow oxygen-related electrochemistry and uncontrollable formation of lithium peroxide (Li2O2) as an insoluble discharge product. In this work, we accommodated the discharge product in macro-scale voids of a carbon-framed architecture with meso-dimensional channels on the carbon frame and open holes connecting the neighboring voids. More importantly, we found that a specific dimension of the voids guaranteed high capacity and cycling durability of LOBs. The best LOB performances were achieved by employing the carbon-framed architecture having voids of 0.8 μm size as the cathode of the LOB when compared with the cathodes having voids of 0.3 and 1.4 μm size. The optimized void size of 0.8 μm allowed only a monolithic integrity of lithium peroxide deposit within a void during discharging. The deposit was grown to be a yarn ball-looking sphere exactly fitting the shape and size of the void. The good electric contact allowed the discharge product to be completely decomposed during charging. On the other hand, the void space was not fully utilized due to the mass transfer pathway blockage at the sub-optimized 0.3 μm and the formation of multiple deposit integrities within a void at the sur-optimized 1.4 μm. Consequently, the critical void dimension at 0.8 μm was superior to other dimensions in terms of the void space utilization efficiency and the lithium peroxide decomposition efficiency, disallowing empty space and side reactions during discharging.
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Affiliation(s)
- Chihyun Hwang
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Myung-Jun Kwak
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Jinhyeon Jeong
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Kyungeun Baek
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Ki-Yong Yoon
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Cheolwon An
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Jin-Wook Min
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Jonghak Kim
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Jeongin Lee
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Ji-Hyun Jang
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Hyun-Kon Song
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
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14
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Sharma P, Han J, Park J, Kim DY, Lee J, Oh D, Kim N, Seo DH, Kim Y, Kang SJ, Hwang SM, Jang JW. Alkali-Metal-Mediated Reversible Chemical Hydrogen Storage Using Seawater. JACS Au 2021; 1:2339-2348. [PMID: 34977902 PMCID: PMC8715542 DOI: 10.1021/jacsau.1c00444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Indexed: 06/14/2023]
Abstract
The economic viability and systemic sustainability of a green hydrogen economy are primarily dependent on its storage. However, none of the current hydrogen storage methods meet all the targets set by the US Department of Energy (DoE) for mobile hydrogen storage. One of the most promising routes is through the chemical reaction of alkali metals with water; however, this method has not received much attention owing to its irreversible nature. Herein, we present a reconditioned seawater battery-assisted hydrogen storage system that can provide a solution to the irreversible nature of alkali-metal-based hydrogen storage. We show that this system can also be applied to relatively lighter alkali metals such as lithium as well as sodium, which increases the possibility of fulfilling the DoE target. Furthermore, we found that small (1.75 cm2) and scaled-up (70 cm2) systems showed high Faradaic efficiencies of over 94%, even in the presence of oxygen, which enhances their viability.
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Affiliation(s)
- Pankaj Sharma
- School
of Energy and Chemical Engineering, Ulsan
National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic
of Korea
| | - Jinhyup Han
- School
of Energy and Chemical Engineering, Ulsan
National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic
of Korea
| | - Jaehyun Park
- School
of Energy and Chemical Engineering, Ulsan
National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic
of Korea
| | - Dong Yeon Kim
- School
of Energy and Chemical Engineering, Ulsan
National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic
of Korea
| | - Jinho Lee
- School
of Energy and Chemical Engineering, Ulsan
National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic
of Korea
| | - Dongrak Oh
- School
of Energy and Chemical Engineering, Ulsan
National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic
of Korea
| | - Namsu Kim
- School
of Energy and Chemical Engineering, Ulsan
National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic
of Korea
| | - Dong-Hwa Seo
- School
of Energy and Chemical Engineering, Ulsan
National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic
of Korea
| | - Youngsik Kim
- School
of Energy and Chemical Engineering, Ulsan
National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic
of Korea
| | - Seok Ju Kang
- School
of Energy and Chemical Engineering, Ulsan
National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic
of Korea
| | - Soo Min Hwang
- School
of Energy and Chemical Engineering, Ulsan
National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic
of Korea
- SKKU
Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Ji-Wook Jang
- School
of Energy and Chemical Engineering, Ulsan
National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic
of Korea
- Emergent
Hydrogen Technology R&D Center, Ulsan
National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
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15
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Koo D, Kang SJ. Nitrate Molten Salt Electrolytes with Iron Oxide Catalysts for Open and Sealed Li-O 2 Batteries. ACS Appl Mater Interfaces 2021; 13:47740-47748. [PMID: 34596374 DOI: 10.1021/acsami.1c16050] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Li-O2 batteries with nitrate molten salt electrolytes are attracting considerable attention owing to their various electrochemical pathways to form a discharge product upon the open and sealed systems. Here, we investigate nitrate molten salt electrolyte-based open and sealed Li-O2 batteries with pristine and iron oxide catalysts. Through the systematic analysis of various Li-O2 battery characteristics, we observe the irreversible electrochemical reactions of the open Li-O2 battery with an iron oxide catalyst that erodes the battery performance due to the detrimental parasitic reaction of H2 gas evolution from the Li anode. In contrast, the sealed Li-O2 system with cathodes containing the iron oxide catalyst exhibits the formation and decomposition of Li2O discharge products without significant side reactions, which guarantees long cycle endurance, high-rate performance, and a gravimetric energy density. Thus, promising electrochemical results from the sealed Li-O2 system with the iron oxide catalyst provide a viable strategy for the high-performance molten salt-based Li-O2 battery.
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Affiliation(s)
- Daeryung Koo
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, South Korea
| | - Seok Ju Kang
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, South Korea
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16
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Cho YG, Jung SH, Jeong J, Cha H, Baek K, Sung J, Kim M, Lee HT, Kong H, Cho J, Kang SJ, Park JM, Song HK. Metal-Ion Chelating Gel Polymer Electrolyte for Ni-Rich Layered Cathode Materials at a High Voltage and an Elevated Temperature. ACS Appl Mater Interfaces 2021; 13:9965-9974. [PMID: 33599475 DOI: 10.1021/acsami.0c21164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Nickel-rich layered oxides (LiNi1-x-yCoxMnyO2; (1 - x - y) ≥ 0.6), the high-energy-density cathode materials of lithium-ion batteries (LIBs), are seriously unstable at voltages higher than 4.5 V versus Li/Li+ and temperatures higher than 50 °C. Herein, we demonstrated that the failure mechanism of a nickel-rich layered oxide (LiNi0.6Co0.2Mn0.2O2) behind the instability was successfully suppressed by employing cyanoethyl poly(vinyl alcohol) having pyrrolidone moieties (Pyrd-PVA-CN) as a metal-ion-chelating gel polymer electrolyte (GPE). The metal-ion-chelating GPE blocked the plating of transition-metal ions dissolved from the cathode by capturing the ions (anode protection). High-concentration metal-ion environments developed around the cathode surface by the GPE suppressed the irreversible phase transition of the cathode material from the layered structure to the rock-salt structure (cathode protection). Resultantly, the capacity retention was significantly improved at a high voltage and a high temperature. Capacity retention and coulombic efficiency of a full-cell configuration of a nickel-rich layered oxide with graphite were significantly improved in the presence of the GPE especially at a high cutoff voltage (4.4 V) and an elevated temperature (55 °C).
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Affiliation(s)
- Yoon-Gyo Cho
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Seo Hyun Jung
- Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology, Ulsan 44412, Korea
| | - Jihong Jeong
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Hyungyeon Cha
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Kyungeun Baek
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Jaekyung Sung
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Minsoo Kim
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Hyun Tae Lee
- Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology, Ulsan 44412, Korea
- Department of Chemistry, Pusan National University, Busan 46241, Korea
| | - Hoyoul Kong
- Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology, Ulsan 44412, Korea
| | - Jaephil Cho
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
| | - Jong Mok Park
- Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology, Ulsan 44412, Korea
| | - Hyun-Kon Song
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Korea
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17
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Baek DS, Lee KA, Park J, Kim JH, Lee J, Lim JS, Lee SY, Shin TJ, Jeong HY, Son JS, Kang SJ, Kim JY, Joo SH. Ordered Mesoporous Carbons with Graphitic Tubular Frameworks by Dual Templating for Efficient Electrocatalysis and Energy Storage. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202012936] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Du San Baek
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Kyung Ah Lee
- Center for Hydrogen Fuel Cell Research Korea Institute of Science and Technology (KIST) 5 Hwarang-ro 14-gil Seoul 02792 Republic of Korea
| | - Jaehyun Park
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Jae Hyung Kim
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Jungsoo Lee
- Department of Materials Science and Engineering UNIST 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - June Sung Lim
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - So Young Lee
- Center for Hydrogen Fuel Cell Research Korea Institute of Science and Technology (KIST) 5 Hwarang-ro 14-gil Seoul 02792 Republic of Korea
| | - Tae Joo Shin
- UNIST Central Research Facilities, UNIST 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Hu Young Jeong
- UNIST Central Research Facilities, UNIST 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Jae Sung Son
- Department of Materials Science and Engineering UNIST 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Jin Young Kim
- Center for Hydrogen Fuel Cell Research Korea Institute of Science and Technology (KIST) 5 Hwarang-ro 14-gil Seoul 02792 Republic of Korea
| | - Sang Hoon Joo
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
- Department of Chemistry UNIST 50 UNIST-gil Ulsan 44919 Republic of Korea
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18
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Baek DS, Lee KA, Park J, Kim JH, Lee J, Lim JS, Lee SY, Shin TJ, Jeong HY, Son JS, Kang SJ, Kim JY, Joo SH. Ordered Mesoporous Carbons with Graphitic Tubular Frameworks by Dual Templating for Efficient Electrocatalysis and Energy Storage. Angew Chem Int Ed Engl 2021; 60:1441-1449. [PMID: 33043551 DOI: 10.1002/anie.202012936] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Indexed: 01/23/2023]
Abstract
Ordered mesoporous carbons (OMCs) have attracted considerable interest owing to their broad utility. OMCs reported to date comprise amorphous rod-like or tubular or graphitic rod-like frameworks, which exhibit tradeoffs between conductivity and surface area. Here we report ordered mesoporous carbons constructed with graphitic tubular frameworks (OMGCs) with tunable pore sizes and mesostructures via dual templating, using mesoporous silica and molybdenum carbide as exo- and endo-templates, respectively. OMGCs simultaneously realize high electrical conductivity and large surface area and pore volume. Benefitting from these features, Ru nanoparticles (NPs) supported on OMGC exhibit superior catalytic activity for alkaline hydrogen evolution reaction and single-cell performance for anion exchange membrane water electrolysis compared to Ru NPs on other OMCs and commercial catalysts. Further, the OMGC-based full-carbon symmetric cell demonstrates excellent performances for Li-ion capacitors.
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Affiliation(s)
- Du San Baek
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Kyung Ah Lee
- Center for Hydrogen Fuel Cell Research, Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14-gil, Seoul, 02792, Republic of Korea
| | - Jaehyun Park
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Jae Hyung Kim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Jungsoo Lee
- Department of Materials Science and Engineering, UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - June Sung Lim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - So Young Lee
- Center for Hydrogen Fuel Cell Research, Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14-gil, Seoul, 02792, Republic of Korea
| | - Tae Joo Shin
- UNIST Central Research Facilities, UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Hu Young Jeong
- UNIST Central Research Facilities, UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Jae Sung Son
- Department of Materials Science and Engineering, UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Jin Young Kim
- Center for Hydrogen Fuel Cell Research, Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14-gil, Seoul, 02792, Republic of Korea
| | - Sang Hoon Joo
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea.,Department of Chemistry, UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea
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19
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Jeong W, Gwon G, Ha JH, Kim D, Eom KJ, Park JH, Kang SJ, Kwak B, Hong JI, Lee S, Hyun DC, Lee S. Enhancing the conductivity of PEDOT:PSS films for biomedical applications via hydrothermal treatment. Biosens Bioelectron 2020; 171:112717. [PMID: 33059169 DOI: 10.1016/j.bios.2020.112717] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Revised: 10/08/2020] [Accepted: 10/09/2020] [Indexed: 01/06/2023]
Abstract
This paper reports a new biocompatible conductivity enhancement of poly (3,4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) films for biomedical applications. Conductivity of PEDOT:PSS layer was reproducibly from 0.495 to 125.367 S cm-1 by hydrothermal (HT) treatment. The HT treatment employs water (relative humidity > 80%) and heat (temperature > 61 °C) instead of organic solvent doping and post-treatments, which can leave undesirable residue. The treatment can be performed using the sterilizing conditions of an autoclave. Additionally, it is possible to simultaneously reduce the electrical resistance, and sterilize the electrode for practical use. The key to conductivity enhancement was the structural rearrangement of PEDOT:PSS, which was determined using atomic force microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet-visible spectroscopy. It was found that PEDOT inter-bridging occurred as a result of the structural rearrangement. Therefore, the conductivity increased on account of the continuous conductive pathways of the PEDOT chains. To test the biocompatible enhancement technique for biomedical applications, certain demonstrations, such as the monitoring of joint movements and skin temperature, and measuring electrocardiogram signals were conducted with the hydrothermal-treated PEDOT:PSS electrode. This simple, biocompatible treatment exhibited significant potential for use in other biomedical applications as well.
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Affiliation(s)
- Wooseong Jeong
- Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333, Techno Jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu, 711873, Republic of Korea
| | - Gihyeok Gwon
- Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333, Techno Jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu, 711873, Republic of Korea
| | - Jae-Hyun Ha
- Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333, Techno Jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu, 711873, Republic of Korea
| | - Dongha Kim
- Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333, Techno Jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu, 711873, Republic of Korea
| | - Ki-Joo Eom
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Ju Hyang Park
- Department of Polymer Science and Engineering, Kyungpook National University (KNU), Daegu, 41566, Republic of Korea
| | - Seok Ju Kang
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Bongseop Kwak
- Dongguk University, College of Medicine, 32 Dongguk-ro, Ilsandong-gu, Goyangsi, Gyeonggi-do, 10326, Republic of Korea
| | - Jung-Il Hong
- Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333, Techno Jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu, 711873, Republic of Korea
| | - Shinbuhm Lee
- Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333, Techno Jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu, 711873, Republic of Korea
| | - Dong Choon Hyun
- Department of Polymer Science and Engineering, Kyungpook National University (KNU), Daegu, 41566, Republic of Korea.
| | - Sungwon Lee
- Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333, Techno Jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu, 711873, Republic of Korea.
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20
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Eom K, Shin YE, Kim JK, Joo SH, Kim K, Kwak SK, Ko H, Jin J, Kang SJ. Tailored Poly(vinylidene fluoride- co-trifluoroethylene) Crystal Orientation for a Triboelectric Nanogenerator through Epitaxial Growth on a Chitin Nanofiber Film. Nano Lett 2020; 20:6651-6659. [PMID: 32809835 DOI: 10.1021/acs.nanolett.0c02488] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Tailoring the crystal orientation of poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) has attracted widespread interest because of its effects on the ferroelectric properties required for various electronic devices. In this study, we investigated the epitaxial growth of PVDF-TrFE on a chitin film for developing triboelectric nanogenerators (TENGs). The crystallographic match between the chitin and PVDF-TrFE enables the development of the intended crystal orientation, with the PVDF-TrFE polarization axis aligned perpendicular to the substrate. In addition, the epitaxially grown PVDF-TrFE on chitin not only enhances the performance of the TENG but also increases the stability of the hygroscopic chitin film against water. The corresponding TENG exhibits a significantly higher output current compared to that of a nonepitaxial PVDF-TrFE/chitin film. Furthermore, the triboelectric sensors based on epitaxial PVDF-TrFE/chitin films allow the monitoring of subtle pressures, suggesting that tailoring the crystal orientation of PVDF-TrFE is a promising approach for developing high-performance TENGs.
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Affiliation(s)
- Kijoo Eom
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Young-Eun Shin
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Joong-Kwon Kim
- School of Materials Science and Engineering, University of Ulsan, Ulsan 44610, Korea
| | - Se Hun Joo
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Kyungtae Kim
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Sang Kyu Kwak
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Hyunhyub Ko
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Jungho Jin
- School of Materials Science and Engineering, University of Ulsan, Ulsan 44610, Korea
| | - Seok Ju Kang
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
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21
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Lee C, Jeon D, Park J, Lee W, Park J, Kang SJ, Kim Y, Ryu J. Tetraruthenium Polyoxometalate as an Atom-Efficient Bifunctional Oxygen Evolution Reaction/Oxygen Reduction Reaction Catalyst and Its Application in Seawater Batteries. ACS Appl Mater Interfaces 2020; 12:32689-32697. [PMID: 32589016 DOI: 10.1021/acsami.0c07225] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Although development and utilization of efficient catalysts with earth-abundant and cheap elements are desired, precious noble metal-based catalysts are still widely used and studied due to the urgent need to address energy and environmental issues. Polyoxometalates (POMs) can be excellent candidates in this context. In this study, we found that oxo-bridged tetraruthenium polyoxometalate (RuPOM) exhibits excellent electrocatalytic activity for both oxygen evolution and reduction reactions (OER and ORR) with minimal use of noble metal elements and can be used for the development of efficient seawater batteries (SWBs). The deposition of RuPOM on a desired electrode with conducting carbon Ketjen black (KB) by the simple slurry coating method imparted bifunctional OER/ORR activity to the underlying electrode. Although the mass activity was similar, RuPOM/KB mixtures exhibited superior activity even compared to commercially available Pt/C when comparing the activity per noble metal element. Based on these findings, we employed RuPOM to develop efficient SWBs. RuPOM significantly lowered the charging potential and increased the discharging potential of SWBs, which are related to OER and ORR, respectively. This study can provide insights into the development of POM-based electrocatalysts and their application in energy storage and conversion devices.
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Affiliation(s)
- Cheolmin Lee
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
- Emergent Hydrogen Technology R&D Center, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Dasom Jeon
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
- Emergent Hydrogen Technology R&D Center, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Jehee Park
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Wonsuk Lee
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Jaehyun Park
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Seok Ju Kang
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Youngsik Kim
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Jungki Ryu
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
- Emergent Hydrogen Technology R&D Center, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
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22
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Pati PB, Jin E, Kim Y, Kim Y, Mun J, Kim SJ, Kang SJ, Choe W, Lee G, Shin H, Park YS. Unveiling 79‐Year‐Old Ixene and Its BN‐Doped Derivative. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004049] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Palas Baran Pati
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Eunji Jin
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Yohan Kim
- Department of Materials Science and Engineering Low Dimensional Carbon Materials Center Center for Multidimensional Carbon Materials Institute for Basic Science (IBS) Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Yongchul Kim
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Jinhong Mun
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - So Jung Kim
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Seok Ju Kang
- Department of Energy Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
- Center for Wave Energy Materials Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Wonyoung Choe
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Geunsik Lee
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
- Center for Wave Energy Materials Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Hyung‐Joon Shin
- Department of Materials Science and Engineering Low Dimensional Carbon Materials Center Center for Multidimensional Carbon Materials Institute for Basic Science (IBS) Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Young S. Park
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
- Center for Wave Energy Materials Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
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23
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Pati PB, Jin E, Kim Y, Kim Y, Mun J, Kim SJ, Kang SJ, Choe W, Lee G, Shin H, Park YS. Unveiling 79‐Year‐Old Ixene and Its BN‐Doped Derivative. Angew Chem Int Ed Engl 2020; 59:14891-14895. [DOI: 10.1002/anie.202004049] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 05/07/2020] [Indexed: 12/27/2022]
Affiliation(s)
- Palas Baran Pati
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Eunji Jin
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Yohan Kim
- Department of Materials Science and Engineering Low Dimensional Carbon Materials Center Center for Multidimensional Carbon Materials Institute for Basic Science (IBS) Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Yongchul Kim
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Jinhong Mun
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - So Jung Kim
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Seok Ju Kang
- Department of Energy Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
- Center for Wave Energy Materials Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Wonyoung Choe
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Geunsik Lee
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
- Center for Wave Energy Materials Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Hyung‐Joon Shin
- Department of Materials Science and Engineering Low Dimensional Carbon Materials Center Center for Multidimensional Carbon Materials Institute for Basic Science (IBS) Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Young S. Park
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
- Center for Wave Energy Materials Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
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24
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Baek D, Lee TK, Jeon I, Joo SH, Shin S, Park J, Kang SJ, Kwak SK, Lee J. Multi-Color Luminescence Transition of Upconversion Nanocrystals via Crystal Phase Control with SiO 2 for High Temperature Thermal Labels. Adv Sci (Weinh) 2020; 7:2000104. [PMID: 32537416 PMCID: PMC7284195 DOI: 10.1002/advs.202000104] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 03/23/2020] [Accepted: 03/25/2020] [Indexed: 06/11/2023]
Abstract
Upconversion nanocrystals (UCNs)-embedded microarchitectures with luminescence color transition capability and enhanced luminescence intensity under extreme conditions are suitable for developing a robust labeling system in a high-temperature thermal industrial process. However, most UCNs based labeling systems are limited by the loss of luminescence owing to the destruction of the crystalline phase or by a predetermined luminescence color without color transition capability. Herein, an unusual crystal phase transition of UCNs to a hexagonal apatite phase in the presence of SiO2 nanoparticles is reported with the enhancements of 130-fold green luminescence and 52-fold luminance as compared to that of the SiO2-free counterpart. By rationally combining this strategy with an additive color mixing method using a mask-less flow lithography technique, single to multiple luminescence color transition, scalable labeling systems with hidden letters-, and multi-luminescence colored microparticles are demonstrated for a UCNs luminescence color change-based high temperature labeling system.
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Affiliation(s)
- Dahye Baek
- School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Tae Kyung Lee
- School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Inkyu Jeon
- School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Se Hun Joo
- School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Subeen Shin
- School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Jaehyun Park
- School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Seok Ju Kang
- School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Sang Kyu Kwak
- School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Jiseok Lee
- School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
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25
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Lee S, Cho IY, Kim D, Park NK, Park J, Kim Y, Kang SJ, Kim Y, Hong SY. Redox-Active Functional Electrolyte for High-Performance Seawater Batteries. ChemSusChem 2020; 13:2220-2224. [PMID: 32037724 DOI: 10.1002/cssc.201903564] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 02/07/2020] [Indexed: 05/25/2023]
Abstract
Rechargeable seawater batteries have gained recognition as key sustainable electrochemical systems by employing the near-infinite and eco-friendly catholyte seawater. However, their practical applications have been limited owing to the low chemical and electrochemical stability of the anode component. Herein, a stability-secured approach was developed by using sodium-biphenyl-dimethoxyethane solution as a redox-active functional anolyte for high-performance seawater batteries. This anolyte system shows high electrochemical stability, superior cycle performance, and cost-effectiveness over conventional electrolyte systems.
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Affiliation(s)
- Seyoung Lee
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, 44919, Republic of Korea
| | - Il Young Cho
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, 44919, Republic of Korea
| | - Dowan Kim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, 44919, Republic of Korea
| | - Nam Kyu Park
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, 44919, Republic of Korea
| | - Jaehyun Park
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, 44919, Republic of Korea
| | - Yongil Kim
- Electrochemistry I, Helmholtz Institute Ulm (HIU), Ulm, 89081, Germany
- Karlsruhe Institute of Technology (KIT), Karlsruhe, 76021, Germany
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, 44919, Republic of Korea
| | - Youngsik Kim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, 44919, Republic of Korea
- Energy Materials and Devices Lab, 4TOONE Corporation, UNIST-gil 50, Ulsan, 44919, Republic of Korea
| | - Sung You Hong
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, 44919, Republic of Korea
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Jeon WC, Lee JH, Kim JC, Kang SJ, Jung SH, Cho SG, Kwak SK. Reaction kinetics of mixture of nitromethane and detonator confined in carbon nanotube. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2019.11.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Oh J, Jeon I, Kim D, You Y, Baek D, Kang SJ, Lee J. Highly Stable Upconverting Nanocrystal-Polydiacetylenes Nanoplates for Orthogonal Dual Signaling-Based Detection of Cyanide. ACS Appl Mater Interfaces 2020; 12:4934-4943. [PMID: 31904923 DOI: 10.1021/acsami.9b20438] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Although the unique optical signaling properties of polydiacetylene (PDA) have been exploited in diverse bio-chemosensors, the practical application of most PDA sensor systems is limited by their instability in harsh environments and fluorescence signal weakness. Herein, a universal design principle for a highly stable PDA sensor system with a practical dual signaling capability is developed to detect cyanide (CN) ions, which are commonly found in drinking water. Effective metal intercalation and enhanced hydrophobic intermolecular interactions between PDA-metal supramolecules are used to construct highly stacked PDA-metal nanoplates that feature unusual optical stability upon exposure to strong acids, bases, organic solvents, and thermal/mechanical stresses, and can selectively detect CN anions, concomitantly undergoing a specific supramolecular structure change. To realize the practical dual signaling capability of the PDA sensor system, upconverting nanocrystals (UCNs) are incorporated into highly stacked PDA-metal nanoplates, and practical dual signaling (orthogonal changes in luminescence and visible color) is demonstrated using a portable detection system. The presented universal design principle is expected to be suitable for the development of other highly stable and selective PDA sensor systems with practical dual signaling capability.
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Affiliation(s)
- Jongwon Oh
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919 , Republic of Korea
| | - Inkyu Jeon
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919 , Republic of Korea
| | - Dowon Kim
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919 , Republic of Korea
| | - Younghoon You
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919 , Republic of Korea
| | - Dahye Baek
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919 , Republic of Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919 , Republic of Korea
| | - Jiseok Lee
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919 , Republic of Korea
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Lim T, Jung GY, Kim JH, Park SO, Park J, Kim YT, Kang SJ, Jeong HY, Kwak SK, Joo SH. Atomically dispersed Pt-N 4 sites as efficient and selective electrocatalysts for the chlorine evolution reaction. Nat Commun 2020; 11:412. [PMID: 31964881 PMCID: PMC6972710 DOI: 10.1038/s41467-019-14272-1] [Citation(s) in RCA: 77] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 12/23/2019] [Indexed: 11/23/2022] Open
Abstract
Chlorine evolution reaction (CER) is a critical anode reaction in chlor-alkali electrolysis. Although precious metal-based mixed metal oxides (MMOs) have been widely used as CER catalysts, they suffer from the concomitant generation of oxygen during the CER. Herein, we demonstrate that atomically dispersed Pt−N4 sites doped on a carbon nanotube (Pt1/CNT) can catalyse the CER with excellent activity and selectivity. The Pt1/CNT catalyst shows superior CER activity to a Pt nanoparticle-based catalyst and a commercial Ru/Ir-based MMO catalyst. Notably, Pt1/CNT exhibits near 100% CER selectivity even in acidic media, with low Cl− concentrations (0.1 M), as well as in neutral media, whereas the MMO catalyst shows substantially lower CER selectivity. In situ electrochemical X-ray absorption spectroscopy reveals the direct adsorption of Cl− on Pt−N4 sites during the CER. Density functional theory calculations suggest the PtN4C12 site as the most plausible active site structure for the CER. Chlorine evolution reaction (CER) is a key electrochemical reaction for chemical, pulp, and paper industries, and water treatments. Here, the authors report that an atomically dispersed Pt−N4 site can catalyse CER with high activity and selectivity under a wide range of Cl– concentrations and pH.
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Affiliation(s)
- Taejung Lim
- Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Gwan Yeong Jung
- Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Jae Hyung Kim
- Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Sung O Park
- Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Jaehyun Park
- Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Yong-Tae Kim
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Pohang, Gyeongbuk, 37673, Republic of Korea
| | - Seok Ju Kang
- Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Hu Young Jeong
- UNIST Central Research Facilities, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Sang Kyu Kwak
- Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea.
| | - Sang Hoon Joo
- Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea.
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Kang KN, Ramadoss A, Min JW, Yoon JC, Lee D, Kang SJ, Jang JH. Wire-Shaped 3D-Hybrid Supercapacitors as Substitutes for Batteries. Nanomicro Lett 2020; 12:28. [PMID: 34138068 PMCID: PMC7770839 DOI: 10.1007/s40820-019-0356-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Accepted: 12/06/2019] [Indexed: 05/13/2023]
Abstract
We report a wire-shaped three-dimensional (3D)-hybrid supercapacitor with high volumetric capacitance and high energy density due to an interconnected 3D-configuration of the electrode allowing for large number of electrochemical active sites, easy access of electrolyte ions, and facile charge transport for flexible wearable applications. The interconnected and compact electrode delivers a high volumetric capacitance (gravimetric capacitance) of 73 F cm-3 (2446 F g-1), excellent rate capability, and cycle stability. The 3D-nickel cobalt-layered double hydroxide onto 3D-nickel wire (NiCo LDH/3D-Ni)//the 3D-manganese oxide onto 3D-nickel wire (Mn3O4/3D-Ni) hybrid supercapacitor exhibits energy density of 153.3 Wh kg-1 and power density of 8810 W kg-1. The red light-emitting diode powered by the as-prepared hybrid supercapacitor can operate for 80 min after being charged for tens of seconds and exhibit excellent electrochemical stability under various deformation conditions. The results verify that such wire-shaped 3D-hybrid supercapacitors are promising alternatives for batteries with long charge-discharge times, for smart wearable and implantable devices.
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Affiliation(s)
- Kyeong-Nam Kang
- School of Energy and Chemical Engineering, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea
| | - Ananthakumar Ramadoss
- Laboratory for Advanced Research in Polymeric Materials, Central Institute of Plastic Engineering and Technology, Bhubaneswar, 751024, India
| | - Jin-Wook Min
- School of Energy and Chemical Engineering, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea
| | - Jong-Chul Yoon
- School of Energy and Chemical Engineering, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea
| | - Deokjung Lee
- School of Mechanical, Aerospace and Nuclear Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea
| | - Ji-Hyun Jang
- School of Energy and Chemical Engineering, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea.
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30
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Hwang C, Yoo J, Jung GY, Joo SH, Kim J, Cha A, Han JG, Choi NS, Kang SJ, Lee SY, Kwak SK, Song HK. Biomimetic Superoxide Disproportionation Catalyst for Anti-Aging Lithium-Oxygen Batteries. ACS Nano 2019; 13:9190-9197. [PMID: 31319025 DOI: 10.1021/acsnano.9b03525] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Reactive oxygen species or superoxide (O2-), which damages or ages biological cells, is generated during metabolic pathways using oxygen as an electron acceptor in biological systems. Superoxide dismutase (SOD) protects cells from superoxide-triggered apoptosis by converting superoxide to oxygen and peroxide. Lithium-oxygen battery (LOB) cells have the same aging problems caused by superoxide-triggered side reactions. We transplanted the function of SOD of biological systems into LOB cells. Malonic acid-decorated fullerene (MA-C60) was used as a superoxide disproportionation chemocatalyst mimicking the function of SOD. As expected, MA-C60 as the superoxide scavenger improved capacity retention along charge/discharge cycles successfully. A LOB cell that failed to provide a meaningful capacity just after several cycles at high current (0.5 mA cm-2) with 0.5 mAh cm-2 cutoff survived up to 50 cycles after MA-C60 was introduced to the electrolyte. Moreover, the SOD-mimetic catalyst increased capacity, e.g., more than a 6-fold increase at 0.2 mA cm-2. The experimentally observed toroidal morphology of the final discharge product of oxygen reduction (Li2O2) and density functional theory calculation confirmed that the solution mechanism of Li2O2 formation, more beneficial than the surface mechanism from the capacity-gain standpoint, was preferred in the presence of MA-C60.
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Affiliation(s)
| | - JongTae Yoo
- R&D Investment Planning Team , Korea Institute of Science & Technology Evaluation and Planning (KISTEP) , Seoul 06775 , Republic of Korea
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31
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Park J, Lee CW, Park JH, Joo SH, Kwak SK, Ahn S, Kang SJ. Capacitive Organic Anode Based on Fluorinated-Contorted Hexabenzocoronene: Applicable to Lithium-Ion and Sodium-Ion Storage Cells. Adv Sci (Weinh) 2018; 5:1801365. [PMID: 30581715 PMCID: PMC6299712 DOI: 10.1002/advs.201801365] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 10/03/2018] [Indexed: 05/29/2023]
Abstract
Conducting polymer-based organic electrochemical capacitor materials have attracted attention because of their highly conductive nature and highly reversible redox reactions on the surface of electrodes. However, owing to their poor stabilities in aprotic electrolytes, alternative organic electrochemical capacitive electrodes are being actively sought. Here, fluorine atoms are introduced into contorted hexabenzocoronene (cHBC) to achieve the first small-molecule-based organic capacitive energy-storage cells that operate at high current rates with satisfactory specific capacities of ≈160 mA h g-1 and superior cycle capabilities (>400) without changing significantly. This high capacitive behavior in the P21/c crystal phase of fluorinated cHBC (F-cHBC) is caused mainly by the fluorine atoms at the end of each peripheral aromatic ring. Combined Monte Carlo simulations and density functional theory (DFT) calculations show that the most electronegative fluorine atoms accelerate ion diffusion on the surface to promote fast Li+ ion uptake and release by an applied current. Moreover, F-cHBC has potential applications as the capacitive anode in Na-ion storage cells. The fast dynamics of its capacitive behavior allow it to deliver a specific capacity of 65 mA h g-1 at a high current of 4000 mA g-1.
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Affiliation(s)
- Jaehyun Park
- Department of Energy EngineeringSchool of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Cheol Woo Lee
- Institute of Advanced Composite MaterialsKorea Institute of Science and Technology (KIST)Jeonbuk55324Republic of Korea
- Applied Materials Institute for BIN ConvergenceDepartment of BIN Convergence Technology and Department of Polymer‐Nano Science and TechnologyChonbuk National UniversityJeonbuk54896Republic of Korea
| | - Ju Hyun Park
- Department of Energy EngineeringSchool of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Se Hun Joo
- Department of Energy EngineeringSchool of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Sang Kyu Kwak
- Department of Energy EngineeringSchool of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Seokhoon Ahn
- Institute of Advanced Composite MaterialsKorea Institute of Science and Technology (KIST)Jeonbuk55324Republic of Korea
| | - Seok Ju Kang
- Department of Energy EngineeringSchool of Energy and Chemical EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
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32
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Lee Y, Lee J, Lee J, Kim K, Cha A, Kang S, Wi T, Kang SJ, Lee HW, Choi NS. Fluoroethylene Carbonate-Based Electrolyte with 1 M Sodium Bis(fluorosulfonyl)imide Enables High-Performance Sodium Metal Electrodes. ACS Appl Mater Interfaces 2018; 10:15270-15280. [PMID: 29648435 DOI: 10.1021/acsami.8b02446] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Sodium (Na) metal anodes with stable electrochemical cycling have attracted widespread attention because of their highest specific capacity and lowest potential among anode materials for Na batteries. The main challenges associated with Na metal anodes are dendritic formation and the low density of deposited Na during electrochemical plating. Here, we demonstrate a fluoroethylene carbonate (FEC)-based electrolyte with 1 M sodium bis(fluorosulfonyl)imide (NaFSI) salt for the stable and dense deposition of the Na metal during electrochemical cycling. The novel electrolyte combination developed here circumvents the dendritic Na deposition that is one of the primary concerns for battery safety and constructs the uniform ionic interlayer achieving highly reversible Na plating/stripping reactions. The FEC-NaFSI constructs the mechanically strong and ion-permeable interlayer containing NaF and ionic compounds such as Na2CO3 and sodium alkylcarbonates.
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Affiliation(s)
- Yongwon Lee
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea
| | - Jaegi Lee
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea
| | - Jeongmin Lee
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea
| | - Koeun Kim
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea
| | - Aming Cha
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea
| | - Sujin Kang
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea
| | - Taeung Wi
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea
| | - Hyun-Wook Lee
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea
| | - Nam-Soon Choi
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea
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Lee Y, Kim KL, Kang HS, Jeong B, Park C, Bae I, Kang SJ, Park YJ, Park C. Epitaxially Grown Ferroelectric PVDF-TrFE Film on Shape-Tailored Semiconducting Rubrene Single Crystal. Small 2018; 14:e1704024. [PMID: 29687614 DOI: 10.1002/smll.201704024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 01/31/2018] [Indexed: 06/08/2023]
Abstract
Epitaxial crystallization of thin poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) films is important for the full utilization of their ferroelectric properties. Epitaxy can offer a route for maximizing the degree of crystallinity with the effective orientation of the crystals with respect to the electric field. Despite various approaches for the epitaxial control of the crystalline structure of PVDF-TrFE, its epitaxy on a semiconductor is yet to be accomplished. Herein, the epitaxial growth of PVDF-TrFE crystals on a single-crystalline organic semiconductor rubrene grown via physical vapor deposition is presented. The epitaxy results in polymer crystals globally ordered with specific crystal orientations dictated by the epitaxial relation between the polymer and rubrene crystal. The lattice matching between the c-axis of PVDF-TrFE crystals and the (210) plane of orthorhombic rubrene crystals develops two degenerate crystal orientations of the PVDF-TrFE crystalline lamellae aligned nearly perpendicular to each other. Thin PVDF-TrFE films with epitaxially grown crystals are incorporated into metal/ferroelectric polymer/metal and metal/ferroelectric polymer/semiconductor/metal capacitors, which exhibit excellent nonvolatile polarization and capacitance behavior, respectively. Furthermore, combined with a printing technique for micropatterning rubrene single crystals, the epitaxy of a PVDF-TrFE film is formed selectively on the patterned rubrene with characteristic epitaxial crystal orientation over a large area.
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Affiliation(s)
- Yujeong Lee
- Department of Materials Science and Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Kang Lib Kim
- Department of Materials Science and Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Han Sol Kang
- Department of Materials Science and Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Beomjin Jeong
- Department of Materials Science and Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Chanho Park
- Department of Materials Science and Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Insung Bae
- Department of Materials Science and Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea
| | - Youn Jung Park
- Samsung Electronics Co., Seongchon-gil 33, Seocho-gu, Seoul, 06765, Republic of Korea
| | - Cheolmin Park
- Department of Materials Science and Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
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Liu T, Bao FL, Kang SJ, Jiang T, Huang DS, Gao W, Geng LJ, Hu YM. [Operative strategy and clinical results of complex four part distal radius fractures by combined palmar and dorsal internal fixation]. Zhonghua Wai Ke Za Zhi 2018. [PMID: 29534411 DOI: 10.3760/cma.j.issn.0529-5815.2018.03.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore a standard procedure for the treatment of combined dorsal and palmar internal fixation for complex four part distal radius fractures and assess its clinical results. Methods: From May 2009 to October 2016, 38 patients(39 sides)who suffered from complex four part distal radius fractures were performed operatively with open reduction and internal fixation via combined dorsal and palmar approach in Department of Orthopaedic Trauma, Qilu Hospital of Shandong University(Qingdao). The series included 22 males(22 sides) and 16 females(17 sides). Age of the patients was 53.5 years ranging from 25 to 79 years.According to Melone classification, there were 34 sides of type of Ⅳ, 5 of type Ⅴ.According to Frykman classification, there were 15 sides of type Ⅶ, 24 sides of type Ⅷ, and all the cases were type C3 according to AO/OTA classification.Preoperatively, the key articular fragments in four part distal radius fractures were identified and the individual fracture patterns from conventional X-ray and CT-scan were analyzed. All the patients were performed combined volar and dorsal fixation.Firstly, a palmar approach which gave access to and fix the palmar-ulnar fragment and the radial styloid fragment was performed.Then a limited dorsal approach across the third extensor compartment which gave access to the dorso-ulnar fragment and a limited dorsal arthrotomy to visualize the radiocarpal joint when necessary were performed.Through dorsal approach, we can address the dorso-ulnar fragment, free intra-articular fragment and direct visualize the joint.Use of a retinacular flap was routinely advocated to help prevent against tendon irritation and rupture.The follow-up control included conventional X-ray, range of motion(ROM), grip strength, and the disabilities of the arm, shoulder and hand index(DASH), as well as the patient-rated wrist evaluation(PRWE) score for functional outcome at 6 and 12 months. Results: Thirty-three patients(34 sides) were followed up for at least 12 months.The would healed well in all cases 2 weeks postoperatively, and no soft tissue infections, necrosis or neurovascular complications occurred.All the fractures of 38 cases(39 sides)healed averaged 3.6 months(ranging from 2.5-5.7 months), and no loss of reduction occurred postoperatively.Anatomic reconstruction with a step or gap of <1 mm was achieved in 37 cases(38 sides), Whereas 5 patients were lost to follow-up at 12 months postoperatively.ROM and grip strength were all recovered to over 85% of the unaffected side(exception of the bilateral patient). Median DASH-index and PRWE were 6.5(0-17) and 9.3(0-20)respectively. Conclusion: Combined volar and dorsal approaches allow achieving anatomic reconstruction in complex four part intra-articular distal radius fractures and reveal good functional outcomes at intermediate follow-up.
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Affiliation(s)
- T Liu
- Department of Orthopaedic Trauma, Qilu Hospital of Shandong University(Qingdao), Qingdao 266035, China
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35
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Dilimon VS, Hwang C, Cho YG, Yang J, Lim HD, Kang K, Kang SJ, Song HK. Superoxide stability for reversible Na-O 2 electrochemistry. Sci Rep 2017; 7:17635. [PMID: 29247227 PMCID: PMC5732307 DOI: 10.1038/s41598-017-17745-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 11/27/2017] [Indexed: 11/09/2022] Open
Abstract
Stabilizing superoxide (O2-) is one of the key issues of sodium-air batteries because the superoxide-based discharge product (NaO2) is more reversibly oxidized to oxygen when compared with peroxide (O22-) and oxide (O2-). Reversibly outstanding performances of sodium-oxygen batteries have been realized with the superoxide discharge product (NaO2) even if sodium peroxide (Na2O2) have been also known as the discharge products. Here we report that the Lewis basicity of anions of sodium salts as well as solvent molecules, both quantitatively represented by donor numbers (DNs), determines the superoxide stability and resultantly the reversibility of sodium-oxygen batteries. A DN map of superoxide stability was presented as a selection guide of salt/solvent pair. Based on sodium triflate (CF3SO3-)/dimethyl sulfoxide (DMSO) as a high-DN-pair electrolyte system, sodium ion oxygen batteries were constructed. Pre-sodiated antimony (Sb) was used as an anode during discharge instead of sodium metal because DMSO is reacted with the metal. The superoxide stability supported by the high DN anion/solvent pair ([Formula: see text] -/DMSO) allowed more reversible operation of the sodium ion oxygen batteries.
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Affiliation(s)
- V S Dilimon
- School of Energy and Chemical Engineering, UNIST, Ulsan, 44919, Korea
| | - Chihyun Hwang
- School of Energy and Chemical Engineering, UNIST, Ulsan, 44919, Korea
| | - Yoon-Gyo Cho
- School of Energy and Chemical Engineering, UNIST, Ulsan, 44919, Korea
| | - Juchan Yang
- School of Energy and Chemical Engineering, UNIST, Ulsan, 44919, Korea
| | - Hee-Dae Lim
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, 08826, Korea
| | - Kisuk Kang
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, 08826, Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, UNIST, Ulsan, 44919, Korea
| | - Hyun-Kon Song
- School of Energy and Chemical Engineering, UNIST, Ulsan, 44919, Korea.
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Chae MR, Kang SJ, Lee KP, Choi BR, Kim HK, Park JK, Kim CY, Lee SW. Onion (Allium cepa L.) peel extract (OPE) regulates human sperm motility via protein kinase C-mediated activation of the human voltage-gated proton channel. Andrology 2017; 5:979-989. [PMID: 28805023 DOI: 10.1111/andr.12406] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 06/13/2017] [Accepted: 06/27/2017] [Indexed: 01/14/2023]
Abstract
Onion (Allium cepa L.) and quercetin protect against oxidative damage and have positive effects on multiple functional parameters of spermatozoa, including viability and motility. However, the associated underlying mechanisms of action have not yet been identified. The aim of this study was to investigate the effect of onion peel extract (OPE) on voltage-gated proton (Hv1) channels, which play a critical role in rapid proton extrusion. This process underlies a wide range of physiological processes, particularly male fertility. The whole-cell patch-clamp technique was used to record the changes in Hv1 currents in HEK293 cells transiently transfected with human Hv1 (HVCN1). The effects of OPE on human sperm motility were also analyzed. OPE significantly activated the outward-rectifying proton currents in a concentration-dependent manner, with an EC50 value of 30 μg/mL. This effect was largely reversible upon washout. Moreover, OPE induced an increase in the proton current amplitude and decreased the time constant of activation at 0 mV from 4.9 ± 1.7 to 0.6 ± 0.1 sec (n = 6). In the presence of OPE, the half-activation voltage (V1/2 ) shifted in the negative direction, from 20.1 ± 5.8 to 5.2 ± 8.7 mV (n = 6), but the slope was not significantly altered. The OPE-induced current was profoundly inhibited by 10 μm Zn2+ , the most potent Hv1 channel inhibitor, and was also inhibited by treatment with GF109203X, a specific protein kinase C (PKC) inhibitor. Furthermore, sperm motility was significantly increased in the OPE-treated groups. OPE exhibits protective effects on sperm motility, at least partially via regulation of the proton channel. Moreover, similar effects were exerted by quercetin, the major flavonoid in OPE. These results suggest OPE, which is rich in the potent Hv1 channel activator quercetin, as a possible new candidate treatment for human infertility.
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Affiliation(s)
- M R Chae
- Department of Urology, Samsung Medical Center, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - S J Kang
- Department of Urology, Samsung Medical Center, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - K P Lee
- Laboratory of Physiology, College of Veterinary Medicine, Chungnam National University, Daejeon, Korea
| | - B R Choi
- Department of Urology, Medical School and Institute for Medical Sciences, Chonbuk National University, Research Institute and Clinical Trial Center of Medical Device of Chonbuk National University Hospital, Jeonju, Korea
| | - H K Kim
- College of Pharmacy, Kyungsung University, Busan, Korea
| | - J K Park
- Department of Urology, Medical School and Institute for Medical Sciences, Chonbuk National University, Research Institute and Clinical Trial Center of Medical Device of Chonbuk National University Hospital, Jeonju, Korea
| | - C Y Kim
- College of Pharmacy and Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, Korea
| | - S W Lee
- Department of Urology, Samsung Medical Center, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Seoul, Korea
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Seo JH, Hwang I, Um HD, Lee S, Lee K, Park J, Shin H, Kwon TH, Kang SJ, Seo K. Cold Isostatic-Pressured Silver Nanowire Electrodes for Flexible Organic Solar Cells via Room-Temperature Processes. Adv Mater 2017; 29:1701479. [PMID: 28605071 DOI: 10.1002/adma.201701479] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 04/27/2017] [Indexed: 06/07/2023]
Abstract
Transparent conducting electrodes (TCEs) are considered to be an essential structural component of flexible organic solar cells (FOSCs). Silver nanowire (AgNW) electrodes are widely used as TCEs owing to their excellent electrical and optical properties. The fabrication of AgNW electrodes has faced challenges in terms of forming large uniform interconnected networks so that high conductivity and reproducibility can be achieved. In this study, a simple method for creating an intimate contact between AgNWs that uses cold isostatic pressing (CIP) is demonstrated. This method increases the conductivity of the AgNW electrodes, which enables the fabrication of high-efficiency inverted FOSCs that have a power conversion efficiency of 8.75% on flexible polyethylene terephthalate with no short circuiting occurring as the CIP process minimizes the surface roughness of the AgNW electrode. This allows to achieve 100% manufacturing yield of FOSCs. Furthermore, these highly efficient FOSCs are proven to only be 2.4% less efficient even for an extreme bending radius of R ≈ 1.5 mm, compared with initial efficiency.
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Affiliation(s)
- Ji Hoon Seo
- Department of Energy Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea
| | - Inchan Hwang
- Department of Energy Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea
- Max Planck Center for Attosecond Science, Max Planck POSTECH/KOREA Research Initiative, Pohang, Gyeongbuk, 37673, South Korea
| | - Han-Don Um
- Department of Energy Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea
| | - Sojeong Lee
- Department of Energy Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea
| | - Kangmin Lee
- Department of Energy Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea
| | - Jeonghwan Park
- Department of Energy Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea
- Max Planck Center for Attosecond Science, Max Planck POSTECH/KOREA Research Initiative, Pohang, Gyeongbuk, 37673, South Korea
| | - Hyeonoh Shin
- Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea
| | - Tae-Hyuk Kwon
- Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea
| | - Seok Ju Kang
- Department of Energy Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea
| | - Kwanyong Seo
- Department of Energy Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea
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Choo SH, Lee SW, Chae MR, Kang SJ, Sung HH, Han DH, Chun JN, Park JK, Kim CY, Kim HK, So I. Effects of eupatilin on the contractility of corpus cavernosal smooth muscle through nitric oxide-independent pathways. Andrology 2017; 5:1016-1022. [PMID: 28719725 DOI: 10.1111/andr.12397] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 05/26/2017] [Accepted: 06/09/2017] [Indexed: 12/19/2022]
Abstract
Eupatilin (5,7-dihydroxy-3,4,6-trimethoxyflavone) is one of the main compounds present in Artemisia species. Eupatilin has both antioxidative and anti-inflammatory properties and a relaxation effect on vascular contraction regardless of endothelial function. We evaluated the relaxant effects of eupatilin on the corpus cavernosum (CC) of rabbits and the underlying mechanisms of its activity in human corpus cavernosum smooth muscle (CCSM) cells. Isolated rabbit CC strips were mounted in an organ bath system. A conventional whole-cell patch clamp technique was used to measure activation of calcium-sensitive K+ -channel currents in human CCSM cells. The relaxation effect of eupatilin was evaluated by cumulative addition (10-5 m ~ 3 × 10-4 m) to CC strips precontracted with 10-5 m phenylephrine. Western blotting analysis was performed to measure myosin phosphatase targeting subunit 1 (MYPT1) and protein kinase C-potentiated inhibitory protein for heterotrimeric myosin light chain phosphatase of 17-kDa (CPI-17) expression and to evaluate the effect of eupatilin on the RhoA/Rho-kinase pathway. Eupatilin effectively relaxed the phenylephrine-induced tone in the rabbit CC strips in a concentration-dependent manner with an estimated EC50 value of 1.2 ± 1.6 × 10-4 m (n = 8, p < 0.05). Iberiotoxin and tetraethylammonium significantly reduced the relaxation effect (n = 8, p < 0.001 and p = 0.003, respectively). Removal of the endothelium or the presence of L-NAME or indomethacin did not affect the relaxation effect of eupatilin. In CCSM cells, the extracellular application of eupatilin 10-4 m significantly increased the outward currents, and the eupatilin-stimulated currents were significantly attenuated by treatment with 10-7 m iberiotoxin (n = 13, p < 0.05). Eupatilin reduced the phosphorylation level of MYPT1 at Thr853 of MLCP and CPI-17 at Thr38. Eupatilin-induced relaxation of the CCSM cells via NO-independent pathways. The relaxation effects of eupatilin on CCSM cells were partially due to activation of BKCa channels and inhibition of RhoA/Rho-kinase.
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Affiliation(s)
- S H Choo
- Department of Urology, Ajou University School of Medicine, Suwon, Korea
| | - S W Lee
- Department of Urology, Samsung Medical Center, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - M R Chae
- Department of Urology, Samsung Medical Center, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - S J Kang
- Department of Urology, Samsung Medical Center, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - H H Sung
- Department of Urology, Samsung Medical Center, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - D H Han
- Department of Urology, Samsung Medical Center, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - J N Chun
- Department of Physiology and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
| | - J K Park
- Department of Urology, Institute for Medical Sciences, Medical School, Chonbuk National University, Research Institute and Clinical Trial Center of Medical Device of Chonbuk National University Hospital, Jeonju, Korea
| | - C Y Kim
- College of Pharmacy and Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, Korea
| | - H K Kim
- College of Pharmacy, Kyungsung University, Busan, Korea
| | - I So
- Department of Physiology, Seoul National University College of Medicine, Seoul, Korea
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Bae JY, Kim CJ, Kim UJ, Song KH, Kim ES, Kang SJ, Oh MD, Park KH, Kim NJ. Concordance of results of blood and tissue cultures from patients with pyogenic spondylitis: a retrospective cohort study. Clin Microbiol Infect 2017; 24:279-282. [PMID: 28698035 DOI: 10.1016/j.cmi.2017.07.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 06/06/2017] [Accepted: 07/03/2017] [Indexed: 01/18/2023]
Abstract
OBJECTIVES To investigate the concordance of results of blood and tissue cultures in patients with pyogenic spondylitis. METHODS We searched for patients with pyogenic spondylitis in whom microorganisms were isolated from both blood and tissue cultures by retrospective review of medical records in three tertiary university-affiliated hospitals between January 2005 and December 2015. The species and antimicrobial susceptibility patterns of isolates from blood and tissue cultures were compared. RESULTS Among 141 patients with pyogenic spondylitis in whom microorganisms were isolated from both blood and tissue cultures, the species of blood and tissue isolates were identical in 135 patients (95.7%, 135/141). Excluding the four anaerobic isolates, we investigated antimicrobial susceptibility patterns of 131 isolates of the same species from blood and tissue cultures. Antibiotic susceptibility patterns were identical in 128 patients (97.7%, 128/131). The most common isolates were Staphylococcus aureus (86 patients; 85 concordant and one discordant), followed by streptococcus (24 patients; 22 concordant and two discordant), and Escherichia coli (eight patients; all concordant). CONCLUSIONS We suggest that a positive blood culture from patients with pyogenic spondylitis could preclude the need for additional tissue cultures, especially when S. aureus and streptococcus grew in blood cultures.
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Affiliation(s)
- J Y Bae
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - C-J Kim
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - U J Kim
- Department of Infectious Diseases, Chonnam National University Medical School, Gwang-ju, Republic of Korea
| | - K-H Song
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - E S Kim
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - S J Kang
- Department of Infectious Diseases, Chonnam National University Medical School, Gwang-ju, Republic of Korea
| | - M-D Oh
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - K-H Park
- Department of Infectious Diseases, Chonnam National University Medical School, Gwang-ju, Republic of Korea.
| | - N J Kim
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.
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40
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Kim JK, Kim DH, Joo SH, Choi B, Cha A, Kim KM, Kwon TH, Kwak SK, Kang SJ, Jin J. Hierarchical Chitin Fibers with Aligned Nanofibrillar Architectures: A Nonwoven-Mat Separator for Lithium Metal Batteries. ACS Nano 2017; 11:6114-6121. [PMID: 28505417 DOI: 10.1021/acsnano.7b02085] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Here, we introduce regenerated fibers of chitin (Chiber), the second most abundant biopolymer after cellulose, and propose its utility as a nonwoven fiber separator for lithium metal batteries (LMBs) that exhibits an excellent electrolyte-uptaking capability and Li-dendrite-mitigating performance. Chiber is produced by a centrifugal jet-spinning technique, which allows a simple and fast production of Chibers consisting of hierarchically aligned self-assembled chitin nanofibers. Following the scrutinization on the Chiber-Li-ion interaction via computational methods, we demonstrate the potential of Chiber as a nonwoven mat-type separator by monitoring it in Li-O2 and Na-O2 cells.
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Affiliation(s)
- Joong-Kwon Kim
- School of Materials Science and Engineering, University of Ulsan , Ulsan Metropolitan City 44610, Republic of Korea
| | | | | | - Byeongwook Choi
- School of Materials Science and Engineering, University of Ulsan , Ulsan Metropolitan City 44610, Republic of Korea
| | | | | | | | | | | | - Jungho Jin
- School of Materials Science and Engineering, University of Ulsan , Ulsan Metropolitan City 44610, Republic of Korea
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41
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Cho W, Myeong S, Kim N, Lee S, Kim Y, Kim M, Kang SJ, Park N, Oh P, Cho J. Critical Role of Cations in Lithium Sites on Extended Electrochemical Reversibility of Co-Rich Layered Oxide. Adv Mater 2017; 29:1605578. [PMID: 28370747 DOI: 10.1002/adma.201605578] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2016] [Revised: 01/23/2017] [Indexed: 06/07/2023]
Abstract
Only a very limited amount of the high theoretical energy density of LiCoO2 as a cathode material has been realized, due to its irreversible deterioration when more than 0.6 mol of lithium ions are extracted. In this study, new insights into the origin of such low electrochemical reversibility, namely the structural collapse caused by electrostatic repulsion between oxygen ions during the charge process are suggested. By incorporating the partial cation migration of LiNiO2 , which produces a screen effect of cations in the 3b-Li site, the phase distortion of LiCoO2 is successfully delayed which in turn expands its electrochemical reversibility. This study elucidates the relationship between the structural reversibility and electrochemical behavior of layered cathode materials and enables new design of Co-rich layered materials for cathodes with high energy density.
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Affiliation(s)
- Woongrae Cho
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea
| | - Seungjun Myeong
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea
| | - Namhyung Kim
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea
| | - Sanghan Lee
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea
| | - Youngki Kim
- UNIST Central Research Facilities (UCRF), Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea
| | - Maengsuk Kim
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea
| | - Seok Ju Kang
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea
| | - Noejung Park
- Department of Physics, School of Natural Science, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea
| | - Pilgun Oh
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea
| | - Jaephil Cho
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea
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42
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Lee WG, Kim DH, Jeon WC, Kwak SK, Kang SJ, Kang SW. Facile control of nanoporosity in Cellulose Acetate using Nickel(II) nitrate additive and water pressure treatment for highly efficient battery gel separators. Sci Rep 2017; 7:1287. [PMID: 28455516 PMCID: PMC5430623 DOI: 10.1038/s41598-017-01399-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 03/29/2017] [Indexed: 12/20/2022] Open
Abstract
We succeed in fabricating nearly straight nanopores in cellulose acetate (CA) polymers for use as battery gel separators by utilizing an inorganic hexahydrate (Ni(NO3)2·6H2O) complex and isostatic water pressure treatment. The continuous nanopores are generated when the polymer film is exposed to isostatic water pressure after complexing the nickel(II) nitrate hexahydrate (Ni(NO3)2·6H2O) with the CA. These results can be attributed to the manner in which the polymer chains are weakened because of the plasticization effect of the Ni(NO3)2·6H2O that is incorporated into the CA. Furthermore, we performed extensive molecular dynamics simulation for confirming the interaction between electrolyte and CA separator. The well controlled CA membrane after water pressure treatment enables fabrication of highly reliable cell by utilizing 2032-type coin cell structure. The resulting cell performance exhibits not only the effect of the physical morphology of CA separator, but also the chemical interaction of electrolyte with CA polymer which facilitates the Li-ion in the cell.
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Affiliation(s)
- Woong Gi Lee
- Department of Chemistry, Sangmyung University, Seoul, 110-743, Republic of Korea
| | - Do Hyeong Kim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea
| | - Woo Cheol Jeon
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea
| | - Sang Kyu Kwak
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea.
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, Republic of Korea.
| | - Sang Wook Kang
- Department of Chemistry, Sangmyung University, Seoul, 110-743, Republic of Korea.
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43
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Yu YJ, Lee GH, Choi JI, Shim YS, Lee CH, Kang SJ, Lee S, Rim KT, Flynn GW, Hone J, Kim YH, Kim P, Nuckolls C, Ahn S. Epitaxially Self-Assembled Alkane Layers for Graphene Electronics. Adv Mater 2017; 29:1603925. [PMID: 27905154 DOI: 10.1002/adma.201603925] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 10/17/2016] [Indexed: 06/06/2023]
Abstract
The epitaxially grown alkane layers on graphene are prepared by a simple drop-casting method and greatly reduce the environmentally driven doping and charge impurities in graphene. Multiscale simulation studies show that this enhancement of charge homogeneity in graphene originates from the lifting of graphene from the SiO2 surface toward the well-ordered and rigid alkane self-assembled layers.
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Affiliation(s)
- Young-Jun Yu
- ICT Materials and Components Basic Research Group, Electronics and Telecommunications Research Institute (ETRI), Daejeon, 34129, Korea
| | - Gwan-Hyoung Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Korea
| | - Ji Il Choi
- Graduate School of Energy, Environment, Water, and Sustainability, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea
| | - Yoon Su Shim
- Graduate School of Energy, Environment, Water, and Sustainability, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea
| | - Chul-Ho Lee
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 136-701, Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, UNIST, Ulsan, 689-798, Korea
| | - Sunwoo Lee
- Department of Electrical Engineering, Columbia University, New York, NY, 10027, USA
| | - Kwang Taeg Rim
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | - George W Flynn
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | - James Hone
- Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA
| | - Yong-Hoon Kim
- Graduate School of Energy, Environment, Water, and Sustainability, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea
| | - Philip Kim
- Department of Physics, Harvard University, Cambridge, MA, 02138, USA
| | - Colin Nuckolls
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | - Seokhoon Ahn
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Jeonbuk, 565-905, Korea
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Wong K, Kang SJ, Bielawski CW, Ruoff RS, Kwak SK. First-Principles Study of the Role of O2 and H2O in the Decoupling of Graphene on Cu(111). J Am Chem Soc 2016; 138:10986-94. [DOI: 10.1021/jacs.6b05333] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Kester Wong
- Center
for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan 44919, Republic of Korea
| | | | - Christopher W. Bielawski
- Center
for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan 44919, Republic of Korea
| | - Rodney S. Ruoff
- Center
for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan 44919, Republic of Korea
| | - Sang Kyu Kwak
- Center
for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan 44919, Republic of Korea
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45
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Kim KL, Lee W, Hwang SK, Joo SH, Cho SM, Song G, Cho SH, Jeong B, Hwang I, Ahn JH, Yu YJ, Shin TJ, Kwak SK, Kang SJ, Park C. Epitaxial Growth of Thin Ferroelectric Polymer Films on Graphene Layer for Fully Transparent and Flexible Nonvolatile Memory. Nano Lett 2016; 16:334-340. [PMID: 26618802 DOI: 10.1021/acs.nanolett.5b03882] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Enhancing the device performance of organic memory devices while providing high optical transparency and mechanical flexibility requires an optimized combination of functional materials and smart device architecture design. However, it remains a great challenge to realize fully functional transparent and mechanically durable nonvolatile memory because of the limitations of conventional rigid, opaque metal electrodes. Here, we demonstrate ferroelectric nonvolatile memory devices that use graphene electrodes as the epitaxial growth substrate for crystalline poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) polymer. The strong crystallographic interaction between PVDF-TrFE and graphene results in the orientation of the crystals with distinct symmetry, which is favorable for polarization switching upon the electric field. The epitaxial growth of PVDF-TrFE on a graphene layer thus provides excellent ferroelectric performance with high remnant polarization in metal/ferroelectric polymer/metal devices. Furthermore, a fully transparent and flexible array of ferroelectric field effect transistors was successfully realized by adopting transparent poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] semiconducting polymer.
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Affiliation(s)
| | | | | | - Se Hun Joo
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 689-798, Korea
| | | | | | | | | | | | | | - Young-Jun Yu
- Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI) , Daejeon 305-700, Korea
| | - Tae Joo Shin
- UNIST Central Research Facilities (UCRF) and School of Natural Science, UNIST 50 UNIST Road, Ulsan 689-798, Korea
| | - Sang Kyu Kwak
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 689-798, Korea
| | - Seok Ju Kang
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 689-798, Korea
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Lee YK, Lee TS, Song IH, Jeong HY, Kang SJ, Kim MW, Ryu SH, Jung IH, Kim JS, Park YS. Inhibition of pulmonary cancer progression by epidermal growth factor receptor-targeted transfection with Bcl-2 and survivin siRNAs. Cancer Gene Ther 2015; 22:335-43. [DOI: 10.1038/cgt.2015.18] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Revised: 02/26/2015] [Accepted: 02/27/2015] [Indexed: 01/20/2023]
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47
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Bae I, Kim RH, Hwang SK, Kang SJ, Park C. Laser-induced nondestructive patterning of a thin ferroelectric polymer film with controlled crystals using Ge8Sb2Te11 alloy layer for nonvolatile memory. ACS Appl Mater Interfaces 2014; 6:15171-15178. [PMID: 25127181 DOI: 10.1021/am503397j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We present a simple but robust nondestructive process for fabricating micropatterns of thin ferroelectric polymer films with controlled crystals. Our method is based on utilization of localized heat arising from thin Ge(8)Sb(2)Te(11) (GST) alloy layer upon exposure of 650 nm laser. The heat was generated on GST layer within a few hundred of nanosecond exposure and subsequently transferred to a thin poly(vinylidene fluoride-co-trifluoroethylene) film deposited on GST layer. By controlling exposure time and power of the scanned laser, ferroelectric patterns of one or two microns in size are fabricated with various shape. In the micropatterned regions, ferroelectric polymer crystals were efficiently controlled in both degree of the crystallinity and the molecular orientations. Nonvolatile memory devices with laser scanned ferroelectric polymer layers exhibited excellent device performance of large remnant polarization, ON/OFF current ratio and data retention. The results are comparable with devices containing ferroelectric films thermally annealed at least for 2 h, making our process extremely efficient for saving time. Furthermore, our approach can be conveniently combined with a number of other functional organic materials for the future electronic applications.
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Affiliation(s)
- Insung Bae
- Department of Materials Science and Engineering, Yonsei University , Seoul 120749, Republic of Korea
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Lee CH, Schiros T, Santos EJG, Kim B, Yager KG, Kang SJ, Lee S, Yu J, Watanabe K, Taniguchi T, Hone J, Kaxiras E, Nuckolls C, Kim P. Epitaxial growth of molecular crystals on van der waals substrates for high-performance organic electronics. Adv Mater 2014; 26:2812-7. [PMID: 24458727 DOI: 10.1002/adma.201304973] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2013] [Revised: 11/24/2013] [Indexed: 05/24/2023]
Abstract
Epitaxial van der Waals (vdW) heterostructures of organic and layered materials are demonstrated to create high-performance organic electronic devices. High-quality rubrene films with large single-crystalline domains are grown on h-BN dielectric layers via vdW epitaxy. In addition, high carrier mobility comparable to free-standing single-crystal counterparts is achieved by forming interfacial electrical contacts with graphene electrodes.
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Affiliation(s)
- Chul-Ho Lee
- Department of Physics, Columbia University, New York, NY, 10027, USA; Department of Chemistry, Columbia University, New York, NY, 10027, USA
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Sung HH, Choo SH, Ko M, Kang SJ, Chae MR, Kam SC, Han DH, So I, Lee SW. Increased expression of TRPC4 channels associated with erectile dysfunction in diabetes. Andrology 2014; 2:550-8. [PMID: 24782410 DOI: 10.1111/j.2047-2927.2014.00214.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 03/09/2014] [Accepted: 03/15/2014] [Indexed: 11/27/2022]
Abstract
In recent reports, an association between altered TRPC channel function and the development of various diabetic complications has drawn the attention of many investigators. The aim of this study was to investigate the expression of TRPC4 channels of corpus smooth muscle (CSM) cells in diabetes, and to evaluate the association between erectile dysfunction (ED) and altered TRPC4 channel function. The expression of TRPC4 in the penile tissue of human, normal and diabetic rat was investigated using RT-PCR, western blotting and immunohistochemistry (IHC). In vivo gene transfer of dominant negative (DN) TRPC4 into the CSM of rat was conducted. In vivo pelvic nerve stimulation was performed to measure erectile function. Expression of TRPC1, TRPC3, TRPC4 and TRPC6 in human and rat CSM tissues was confirmed by RT-PCR, western blot and IHC. In the diabetic rat, the expression levels of mRNA and protein of the TRPC4, and TRPC6 were significantly increased compared to control rats (p < 0.05). The change in TRPC4 expression in the diabetic rats was higher than those of the other TRPC subunits (p < 0.05). The IHC showed that only TRPC4 expression had a higher intensity in the diabetes compared to normal rats (p < 0.05). Gene transfection with TRPC4(DN) into the diabetic rats restored erectile function to levels similar to that of normal controls. Gene expression of TRPC4(DN) in CSM tissue was confirmed by RT-PCR 2 weeks after transfection. This study demonstrated that TRPC4 channel expression increased in the penile CSM cells of diabetic rats. The down-regulation of TRPC4 with DN form restored erectile function in the diabetic rats. The alteration of TRPC4 channel is one of pathophysiology of ED and could be a target for drug development for ED.
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Affiliation(s)
- H H Sung
- Department of Urology, Samsung Medical Center, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Seoul, South Korea
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Bae I, Hwang SK, Kim RH, Kang SJ, Park C. Wafer-scale arrays of nonvolatile polymer memories with microprinted semiconducting small molecule/polymer blends. ACS Appl Mater Interfaces 2013; 5:10696-10704. [PMID: 24070419 DOI: 10.1021/am402852y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Nonvolatile ferroelectric-gate field-effect transistors (Fe-FETs) memories with solution-processed ferroelectric polymers are of great interest because of their potential for use in low-cost flexible devices. In particular, the development of a process for patterning high-performance semiconducting channel layers with mechanical flexibility is essential not only for proper cell-to-cell isolation but also for arrays of flexible nonvolatile memories. We demonstrate a robust route for printing large-scale micropatterns of solution-processed semiconducting small molecules/insulating polymer blends for high performance arrays of nonvolatile ferroelectric polymer memory. The nonvolatile memory devices are based on top-gate/bottom-contact Fe-FET with ferroelectric polymer insulator and micropatterned semiconducting blend channels. Printed micropatterns of a thin blended semiconducting film were achieved by our selective contact evaporation printing, with which semiconducting small molecules in contact with a micropatterned elastomeric poly(dimethylsiloxane) (PDMS) mold were preferentially evaporated and absorbed into the PDMS mold while insulating polymer remained intact. Well-defined micrometer-scale patterns with various shapes and dimensions were readily developed over a very large area on a 4 in. wafer, allowing for fabrication of large-scale printed arrays of Fe-FETs with highly uniform device performance. We statistically analyzed the memory properties of Fe-FETs, including ON/OFF ratio, operation voltage, retention, and endurance, as a function of the micropattern dimensions of the semiconducting films. Furthermore, roll-up memory arrays were produced by successfully detaching large-area Fe-FETs printed on a flexible substrate with a transient adhesive layer from a hard substrate and subsequently transferring them to a nonplanar surface.
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Affiliation(s)
- Insung Bae
- Department of Materials Science and Engineering, Yonsei University , Seoul 120-749, Republic of Korea
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