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Sim YL, Lee J, Oh SM, Kim DB, Kim K, Baeck SH, Shim SE, Qian Y. Mitigation of Silicon Contamination in Fuel Cell Gasket Materials through Silica Surface Treatment. Polymers (Basel) 2024; 16:914. [PMID: 38611172 PMCID: PMC11013664 DOI: 10.3390/polym16070914] [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: 03/04/2024] [Revised: 03/21/2024] [Accepted: 03/25/2024] [Indexed: 04/14/2024] Open
Abstract
Gaskets and seals are essential components in the operation of proton exchange membrane (PEM) fuel cells and are required for keeping hydrogen and air/oxygen within their individual compartments. The durability of these gaskets and seals is necessary, as it influences not only the lifespan but also the electrochemical efficiency of the PEM fuel cell. In this study, the cause of silicon leaching from silicone gaskets under simulated fuel cell conditions was investigated. Additionally, to reduce silicon leaching, the silica surface was treated with methyltrimethoxysilane, vinyltriethoxysilane, and (3,3,3-trifluoropropyl)trimethoxysilane. Changes in the silica surface chemistry were investigated by scanning electron microscopy, energy dispersive X-ray spectroscopy, thermogravimetric analysis, elemental analysis, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. Inductively coupled plasma-optical emission spectroscopy analysis revealed that surface-treated silica was highly effective in reducing silicon leaching.
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Affiliation(s)
- Yoo Lim Sim
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, NengYuan Street 2, Tianhe District, Guangzhou 510640, China
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, Republic of Korea; (J.L.); (D.B.K.)
| | - Jaewon Lee
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, Republic of Korea; (J.L.); (D.B.K.)
| | - Su Min Oh
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, Republic of Korea; (J.L.); (D.B.K.)
| | - Dong Beom Kim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, Republic of Korea; (J.L.); (D.B.K.)
| | - Kijong Kim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, Republic of Korea; (J.L.); (D.B.K.)
| | - Sung-Hyeon Baeck
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, Republic of Korea; (J.L.); (D.B.K.)
| | - Sang Eun Shim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, Republic of Korea; (J.L.); (D.B.K.)
| | - Yingjie Qian
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, NengYuan Street 2, Tianhe District, Guangzhou 510640, China
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, Republic of Korea; (J.L.); (D.B.K.)
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Lee K, Sim YL, Jeong H, Kim A, Lee Y, Shim SE, Qian Y. Mechanochemically functionalized and fibrillated microcrystalline cellulose as a filler in silicone foam: An integrated experimental and simulation investigation. Carbohydr Polym 2024; 327:121660. [PMID: 38171679 DOI: 10.1016/j.carbpol.2023.121660] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 11/29/2023] [Accepted: 12/01/2023] [Indexed: 01/05/2024]
Abstract
Fibrillated celluloses have gained significant attention due to their exceptional mechanical properties and eco-friendly characteristics, which make them suitable for various applications. In this study, we designed a precise approach for producing highly fibrillated microcrystalline cellulose (MCC) via ball-milling treatment using four typical silane coupling agents. The empirical data demonstrate that the fibrillization of MCC and the properties of fibrillated MCC are largely affected by the size and geometry of the functional groups of the silanes. After ball-milling, most MCC displayed enhanced e-beam tolerance and thermal stability, whereas the silane loading amount, surface area, and morphology of fibrillated MCC appeared to be random, which was exemplified by the proportional and non-proportional relationship between the loading amount and surface area of methyl silane- and phenyl silane-treated MCC, respectively. Density functional theory calculations and molecular dynamics simulations were employed to obtain the intricate details. The simulation results were in agreement with the experimental results. Finally, fibrillated MCC was incorporated into silicone foams as an additive. The thermal stability of fibrillated MCC with added silicone was greatly improved, and the tensile strength of fibrillated MCC-containing silicone foam was 44.1 and 5.4 times higher than that of the neat and MCC-containing silicone foams, respectively.
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Affiliation(s)
- Kyoungwon Lee
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea.
| | - Yoo Lim Sim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea
| | - Hyeonwoo Jeong
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea.
| | - Asell Kim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea.
| | - Yongjin Lee
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea.
| | - Sang Eun Shim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea.
| | - Yingjie Qian
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea.
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3
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Kim M, Min K, Ko D, Seong H, Eun Shim S, Baeck SH. Regulating the electronic structure of Ni 2P by one-step Co, N dual-doping for boosting electrocatalytic performance toward oxygen evolution reaction and urea oxidation reaction. J Colloid Interface Sci 2023; 650:1851-1861. [PMID: 37515975 DOI: 10.1016/j.jcis.2023.07.158] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [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: 06/13/2023] [Revised: 07/13/2023] [Accepted: 07/24/2023] [Indexed: 07/31/2023]
Abstract
The development of efficient bifunctional electrocatalysts for oxygen evolution reaction (OER) and urea oxidation reaction (UOR) is critical for hydrogen production and wastewater purification. In this work, we propose a facile synthetic method for Co and N dual-doped Ni2P directly grown on Ni foam (Co-Ni2P-N/NF) using hydrothermal and annealing process. Simultaneous Co and N dual-doping into Ni2P not only modifies the surface electronic structure, but also generates a multitude of active sites with high valence states, which are beneficial for improving electrocatalytic kinetics for both OER and UOR. As a result, the Co-Ni2P-N/NF catalyst exhibits a low overpotential of 329 mV to deliver a current density of 100 mA cm-2 for OER in alkaline solution, which is much lower than that of the state-of-the-art RuO2 electrocatalyst. In addition, the urea-assisted water oxidation process exhibits a significant reduction of approximately 163 mV in the required potential at 100 mA cm-2 compared to that of the OER, which highlights the remarkable potential of the prepared Co-Ni2P-N/NF electrocatalyst in facilitating the purification of wastewater and hydrogen production with significantly lower energy consumption.
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Affiliation(s)
- Minjung Kim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy Materials and Process, Inha University, Incheon 22212, Republic of Korea
| | - Kyeongseok Min
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy Materials and Process, Inha University, Incheon 22212, Republic of Korea
| | - Dasol Ko
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy Materials and Process, Inha University, Incheon 22212, Republic of Korea
| | - Haemin Seong
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy Materials and Process, Inha University, Incheon 22212, Republic of Korea
| | - Sang Eun Shim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy Materials and Process, Inha University, Incheon 22212, Republic of Korea
| | - Sung-Hyeon Baeck
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy Materials and Process, Inha University, Incheon 22212, Republic of Korea.
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So JI, Lee CS, Kim BS, Jeong HW, Seo JS, Baeck SH, Shim SE, Qian Y. Improvement of Heat Resistance of Fluorosilicone Rubber Employing Vinyl-Functionalized POSS as a Chemical Crosslinking Agent. Polymers (Basel) 2023; 15:1300. [PMID: 36904542 PMCID: PMC10007170 DOI: 10.3390/polym15051300] [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: 12/31/2022] [Revised: 02/24/2023] [Accepted: 03/02/2023] [Indexed: 03/08/2023] Open
Abstract
Fluorosilicone rubber (F-LSR) is a promising material that can be applied in various cutting-edge industries. However, the slightly lower thermal resistance of F-LSR compared with that of conventional PDMS is difficult to overcome by applying nonreactive conventional fillers that readily agglomerate owing to their incompatible structure. Polyhedral oligomeric silsesquioxane with vinyl groups (POSS-V) is a suitable material that may satisfy this requirement. Herein, F-LSR-POSS was prepared using POSS-V as a chemical crosslinking agent chemically bonded with F-LSR through hydrosilylation. All F-LSR-POSSs were successfully prepared and most of the POSS-Vs were uniformly dispersed in the F-LSR-POSSs, as confirmed by Fourier transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance spectroscopy (1H-NMR), scanning electron microscopy (SEM), and X-ray diffraction (XRD) measurements. The mechanical strength and crosslinking density of the F-LSR-POSSs were determined using a universal testing machine (UTM) and dynamic mechanical analysis (DMA), respectively. Finally, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) measurements confirmed that the low-temperature thermal properties were maintained, and the heat resistance was significantly improved compared with conventional F-LSR. Eventually, the poor heat resistance of the F-LSR was overcome with three-dimensional high-density crosslinking by introducing POSS-V as a chemical crosslinking agent, thereby expanding the potential fluorosilicone applications.
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Affiliation(s)
| | | | | | | | | | | | - Sang Eun Shim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, Republic of Korea
| | - Yingjie Qian
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, Republic of Korea
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An H, Min K, Lee Y, Na R, Shim SE, Baeck SH. Sacrificial template induced Fe-, N-, and S-tridoped hollow carbon sphere as a highly efficient electrocatalyst for oxygen reduction reaction. Molecular Catalysis 2022. [DOI: 10.1016/j.mcat.2022.112589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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6
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Kim J, Lee J, Hwang S, Park K, Hong S, Lee S, Shim SE, Qian Y. Simultaneous Effects of Carboxyl Group-Containing Hyperbranched Polymers on Glass Fiber-Reinforced Polyamide 6/Hollow Glass Microsphere Syntactic Foams. Polymers (Basel) 2022; 14:polym14091915. [PMID: 35567084 PMCID: PMC9099570 DOI: 10.3390/polym14091915] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 04/03/2022] [Accepted: 04/26/2022] [Indexed: 11/16/2022] Open
Abstract
The hollow glass microsphere (HGM) containing polymer materials, which are named as syntactic foams, have been applied as lightweight materials in various fields. In this study, carboxyl group-containing hyperbranched polymer (HBP) was added to a glass fiber (GF)-reinforced syntactic foam (RSF) composite for the simultaneous enhancement of mechanical and rheological properties. HBP was mixed in various concentrations (0.5–2.0 phr) with RSF, which contains 23 wt% of HGM and 5 wt% of GF, and the rheological, thermal, and mechanical properties were characterized systematically. As a result of the lubricating effect of the HBP molecule, which comes from its dendritic architecture, the viscosity, storage modulus, loss modulus, and the shear stress of the composite decreased as the HBP content increased. At the same time, because of the hydrogen bonding among the polymer, filler, and HBP, the compatibility between filler and the polymer matrix was enhanced. As a result, by adding a small amount (0.5–2.0 phr) of HBP to the RSF composite, the tensile strength and flexural modulus were increased by 24.3 and 9.7%, respectively, and the specific gravity of the composite was decreased from 0.948 to 0.917. With these simultaneous effects on the polymer composite, HBP could be potentially utilized further in the field of lightweight materials.
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Affiliation(s)
- Jincheol Kim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Michuhol-gu, Incheon 22212, Korea; (J.K.); (J.L.); (S.H.); (K.P.)
| | - Jaewon Lee
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Michuhol-gu, Incheon 22212, Korea; (J.K.); (J.L.); (S.H.); (K.P.)
| | - Sosan Hwang
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Michuhol-gu, Incheon 22212, Korea; (J.K.); (J.L.); (S.H.); (K.P.)
| | - Kyungjun Park
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Michuhol-gu, Incheon 22212, Korea; (J.K.); (J.L.); (S.H.); (K.P.)
| | - Sanghyun Hong
- LG Electronics Inc. 51, Gasan Digital 1-ro, Geumcheon-gu, Seoul 08592, Korea; (S.H.); (S.L.)
| | - Seojin Lee
- LG Electronics Inc. 51, Gasan Digital 1-ro, Geumcheon-gu, Seoul 08592, Korea; (S.H.); (S.L.)
| | - Sang Eun Shim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Michuhol-gu, Incheon 22212, Korea; (J.K.); (J.L.); (S.H.); (K.P.)
- Correspondence: (S.E.S.); (Y.Q.)
| | - Yingjie Qian
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Michuhol-gu, Incheon 22212, Korea; (J.K.); (J.L.); (S.H.); (K.P.)
- Correspondence: (S.E.S.); (Y.Q.)
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Kim BS, Choi J, Park YS, Qian Y, Shim SE. Semi-Rigid Polyurethane Foam and Polymethylsilsesquioxane Aerogel Composite for Thermal Insulation and Sound Absorption. Macromol Res 2022. [DOI: 10.1007/s13233-022-0026-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Hwang S, Jin SH, Kim Y, Seo JS, So JI, Kim J, Lee Y, Baeck SH, Shim SE, Qian Y. Deciphering van der Waals interaction between polypropylene and carbonated fly ash from experimental and molecular simulation. J Hazard Mater 2022; 421:126725. [PMID: 34332478 DOI: 10.1016/j.jhazmat.2021.126725] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 04/28/2021] [Revised: 07/20/2021] [Accepted: 07/21/2021] [Indexed: 06/13/2023]
Abstract
Pollution emitted from power plants, including a considerable amount of fly ash (FA) and carbon dioxide (CO2), annually increases and is challenging from an environmentally friendly and sustainable point of view. To date, laboratory-scaled approaches cannot efficiently replace the FA-landfilling and mitigate the stress from CO2 emission. Here, a practically operatable fundamental work by combining carbonated FA (C-FA)-immobilizing CO2 in FA-and polypropylene (PP) matrix is reported and reveals abnormal mechanical and thermal features clarified by calculating van der Waals (vdW) interaction from an atomic scale. This is the first study wherein the interaction between instantaneous dipole moment-induced PP and fillers is simulated and examined. The vdW interactions at the (hetero)interfaces are -59.66, -82.30, and -224.39 kJ mol-1 Å-2 for PP, calcium oxide (CaO; before carbonation), and calcium carbonate (CaCO3; after carbonation), respectively, which provides concrete theoretical support for interesting findings such as the independence of tensile strength on filler loadings and "well-grown" interface-induced higher conductivity characteristics of the composites. Therefore, this work can offer practical solutions to mitigate pollution, provide a new perspective on fundamental physical interactions, and guide the development of practical next-generation composite materials.
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Affiliation(s)
- Sosan Hwang
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea
| | - Sung Hoon Jin
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea
| | - Yongha Kim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea
| | - Jin Sung Seo
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea
| | - Jae-Il So
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea
| | - Jincheol Kim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea
| | - Yongjin Lee
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea
| | - Sung-Hyeon Baeck
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea
| | - Sang Eun Shim
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea.
| | - Yingjie Qian
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, South Korea.
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Min K, Yoo R, Kim S, Kim H, Shim SE, Lim D, Baeck SH. Facile synthesis of P-doped NiCo2S4 nanoneedles supported on Ni foam as highly efficient electrocatalysts for alkaline oxygen evolution reaction. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.139236] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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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Qian Y, Hwang S, Lee J, Seo JS, Baeck SH, Shim SE. Novel electroless plating of silver nanoparticles on graphene nanoplatelets and its application for highly conductive epoxy composites. J IND ENG CHEM 2021. [DOI: 10.1016/j.jiec.2021.01.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yang S, Nahar Fatema K, Kim IJ, Ryu J, Eun Shim S, Oh WC. Novel preparation and high electrical performance effect of Mn-doped ultra-high surface area activated carbon (USAC) as an additive for Ni hybrid capacitors. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.02.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kim Y, Hwang S, Choi J, Lee J, Yu K, Baeck SH, Shim SE, Qian Y. Valorization of fly ash as a harmless flame retardant via carbonation treatment for enhanced fire-proofing performance and mechanical properties of silicone composites. J Hazard Mater 2021; 404:124202. [PMID: 33129019 DOI: 10.1016/j.jhazmat.2020.124202] [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] [Received: 05/25/2020] [Revised: 10/05/2020] [Accepted: 10/05/2020] [Indexed: 06/11/2023]
Abstract
Owing to the environmental and economic problems arising from fly ash (FA), there have been various ongoing efforts over the past decades to find a use for it. Among the various applications of FA, its use as a filler in polymer composites has gained much attention. However, most studies have applied FA as a semi-reinforcing filler, which only marginally improves mechanical properties arising from the poor surface wettability of FA with polymer matrices. To solve this problem and to explore new applications, FA was carbonated by bubbling CO2 in water in this study. The carbonated FA was adopted as a fire-proofing filler in silicone rubber (SR). The surface properties and compositional changes of FA by carbonation were thoroughly examined. Mechanical and thermal properties of carbonated FA-filled SR were evaluated. In particular, the gas torch test confirmed that the carbonation of FA increased the penetration time of SR composites by 11%. In addition, the penetration time of the carbonated FA-filled SR composite was 2-3 times greater than that of the composites filled with commercially available fillers.
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Affiliation(s)
- Yongha Kim
- Department of Chemical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, South Korea
| | - Sosan Hwang
- Department of Chemical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, South Korea
| | - Jounghwan Choi
- Department of Chemical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, South Korea
| | - Jaewon Lee
- Department of Chemical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, South Korea
| | - Kwangsun Yu
- Department of Chemical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, South Korea
| | - Sung-Hyeon Baeck
- Department of Chemical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, South Korea
| | - Sang Eun Shim
- Department of Chemical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, South Korea.
| | - Yingjie Qian
- Department of Chemical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, South Korea.
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Otgonbayar Z, Fatema KN, Yang S, Kim IJ, Kim M, Shim SE, Oh WC. Temperature dependence for high electrical performance of Mn-doped high surface area activated carbon (HSAC) as additives for hybrid capacitor. Sci Rep 2021; 11:534. [PMID: 33436665 PMCID: PMC7804247 DOI: 10.1038/s41598-020-79469-7] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 10/26/2020] [Indexed: 11/18/2022] Open
Abstract
Herein, we manufactured the positive and negative electrodes for the hybrid capacitor. The Mn-doped High surface area of Activated carbon composite used for the positive electrode and as-prepared composite was calcined at 600 °C and 800 °C. The morphological structures and pore-size distributions of MnYP-600HTT and MnYP-800HTT were characterized by means of XRD, SEM, EDAX, TEM, and BET. According to the BET specific surface-area evaluation, MnYP-600HTT and MnYP-800HTT were 1272.6 and 1388.1 m2/g, respectively. Total pore volumes were 0.627 and 0.687 cm3/g, which is beneficial for forming ion-transport channels in electrochemical reactions. The MnYP-600HTT electrode had a high specific capacity of 177.2 mAh/g at 20C, and the capacity retention was 64.8%. During the entire cycling, MnYP-600HTT had excellent cyclic stability in 500 cycles along with high efficiency. The robust design of the MnYP-600HTT and MnYP-800HTT cathode materials introduced in this work pave the way for designing next-generation supercapacitors operating at ultra-high C rates. The Mn-doped high surface of activated carbon had stable energy density and superior cycling stability that were demonstrated in supercapacitor systems.
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Affiliation(s)
- Zambaga Otgonbayar
- Department of Advanced Materials Science and Engineering, Hanseo University, Seosan-si, Chungnam, 356-706, Republic of Korea
| | - Kamrun Nahar Fatema
- Department of Advanced Materials Science and Engineering, Hanseo University, Seosan-si, Chungnam, 356-706, Republic of Korea
| | - Sunhye Yang
- Korea Electrotechnology Research Institute, 12, Boolmosan-ro, 10beon-gil, Seongsan-gu, Changwon-si, Gyeongsangnam-do, 51543, Republic of Korea.,Department of Chemical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon, 22212, Republic of Korea
| | - Ick-Jun Kim
- Korea Electrotechnology Research Institute, 12, Boolmosan-ro, 10beon-gil, Seongsan-gu, Changwon-si, Gyeongsangnam-do, 51543, Republic of Korea
| | - Minchul Kim
- Korea Electrotechnology Research Institute, 12, Boolmosan-ro, 10beon-gil, Seongsan-gu, Changwon-si, Gyeongsangnam-do, 51543, Republic of Korea
| | - Sang Eun Shim
- Department of Chemical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon, 22212, Republic of Korea.
| | - Won-Chun Oh
- Department of Advanced Materials Science and Engineering, Hanseo University, Seosan-si, Chungnam, 356-706, Republic of Korea. .,College of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, 232001, People's Republic of China.
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Lim D, Oh E, Lim C, Shim SE, Baeck SH. Fe-doped Ni3S2 nanoneedles directly grown on Ni foam as highly efficient bifunctional electrocatalysts for alkaline overall water splitting. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.137080] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Hwang S, Kim Y, Choi K, Jin SH, Baeck SH, Shim SE. Thermal Stability and Mechanical Properties of Silicone Rubber Composites Filled with Wollastonite/Mineral Fiber Hybrid Fire-proof Fillers. pk 2019. [DOI: 10.7317/pk.2019.43.6.965] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Kim N, Lim D, Choi Y, Shim SE, Baeck SH. Hexagonal β-Ni(OH)2 nanoplates with oxygen vacancies as efficient catalysts for the oxygen evolution reaction. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.134868] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Lee YS, Lee SY, Kim KS, Noda S, Shim SE, Yang CM. Effective Heat Transfer Pathways of Thermally Conductive Networks Formed by One-Dimensional Carbon Materials with Different Sizes. Polymers (Basel) 2019; 11:polym11101661. [PMID: 31614671 PMCID: PMC6835844 DOI: 10.3390/polym11101661] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 10/02/2019] [Accepted: 10/08/2019] [Indexed: 11/16/2022] Open
Abstract
We investigated the heat transfer behavior of thermally conductive networks with one-dimensional carbon materials to design effective heat transfer pathways for hybrid filler systems of polymer matrix composites. Nano-sized few-walled carbon nanotubes (FWCNTs) and micro-sized mesophase pitch-based carbon fibers (MPCFs) were used as the thermally conductive materials. The bulk density and thermal conductivity of the FWCNT films increased proportionally with the ultrasonication time due to the enhanced dispersibility of the FWCNTs in an ethanol solvent. The ultrasonication-induced densification of the FWCNT films led to the effective formation of filler-to-filler connections, resulting in improved thermal conductivity. The thermal conductivity of the FWCNT-MPCF hybrid films was proportional to the MPCF content (maximum thermal conductivity at an MPCF content of 60 wt %), indicating the synergistic effect on the thermal conductivity enhancement. Moreover, the MPCF-to-MPCF heat transfer pathways in the FWCNT-MPCF hybrid films were the most effective in achieving high thermal conductivity due to the smaller interfacial area and shorter heat transfer pathway of the MPCFs. The FWCNTs could act as thermal bridges between neighboring MPCFs for effective heat transfer. Furthermore, the incorporation of Ag nanoparticles of approximately 300 nm into the FWCNT-MPCF hybrid film dramatically enhanced the thermal conductivity, which was closely related to a decreased thermal interfacial resistance at the intersection points between the materials. Epoxy-based composites loaded with the FWCNTs, MPCFs, FWCNT-MPCF hybrids, and FWCNT-MPCF-Ag hybrid fillers were also fabricated. A similar trend in thermal conductivity was observed in the polymer matrix composite with carbon-based hybrid films.
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Affiliation(s)
- Yun Seon Lee
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), 92 Chudong-ro, Wanju-gun, Jeonbuk 55324, Korea.
- Department of Chemical Engineering, Inha University, 100 Inha-ro, Nam-gu, Incheon 22212, Korea.
| | - Seung-Yong Lee
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), 92 Chudong-ro, Wanju-gun, Jeonbuk 55324, Korea.
- Magok R&D campus, LG Innotek, 30 Magokjungang 10-ro, Gangseo-gu, Seoul 07796, Korea.
| | - Keun Soo Kim
- Department of Physics and Graphene Research Institute, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea.
| | - Suguru Noda
- Department of Applied Chemistry, School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
| | - Sang Eun Shim
- Department of Chemical Engineering, Inha University, 100 Inha-ro, Nam-gu, Incheon 22212, Korea.
| | - Cheol-Min Yang
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), 92 Chudong-ro, Wanju-gun, Jeonbuk 55324, Korea.
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Puthiaraj P, Yu K, Shim SE, Ahn WS. Pd(II)-immobilized on a nanoporous triazine-based covalent imine framework for facile cyanation of haloarenes with K4Fe(CN)6. Molecular Catalysis 2019. [DOI: 10.1016/j.mcat.2019.110395] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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19
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Qian Y, So J, Lee MY, Hwang S, Jin MJ, Shim SE. Synthesis of novel and room temperature-operable palladium complexes on graphene oxide: An efficient recyclable catalyst for Suzuki-Miyaura coupling reactions. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.03.033] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Son S, Lim D, Nam D, Kim J, Shim SE, Baeck SH. N, S-doped nanocarbon derived from ZIF-8 as a highly efficient and durable electro-catalyst for oxygen reduction reaction. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.03.036] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Qian Y, Jeong SY, Baeck SH, Jin MJ, Shim SE. A palladium complex confined in a thiadiazole-functionalized porous conjugated polymer for the Suzuki–Miyaura coupling reaction. RSC Adv 2019; 9:33563-33571. [PMID: 35528885 PMCID: PMC9073541 DOI: 10.1039/c9ra06709d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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: 08/26/2019] [Accepted: 10/08/2019] [Indexed: 11/26/2022] Open
Abstract
Porous organic polymers (POPs) with well-distributed and tunable functional groups acting as ligands for specific reactions are promising supports for confining useful novel metals such as Pd, Au, and Pd. Herein, a thiadiazole-containing POP has been successfully synthesized and used for immobilizing Pd species. Pd immobilized inside the micropores (2.3 nm) of the POP material is easily prepared owing to a large amount of the strong anchoring group, thiadiazole, which is intrinsically distributed in the as-prepared POP. The rigid thiadiazole-containing polymer can stabilize the central metal rather than poisoning it. The as-prepared catalyst shows excellent catalytic activity in Suzuki–Miyaura coupling reactions under mild reaction conditions and low catalyst loading. Importantly, the intrinsically distributed thiadiazole ligands can stabilize the Pd moiety, preventing aggregation and leaching, and afford excellent catalytic lifetimes. Consequently, the catalyst can be reused 10 times without a significant loss of its catalytic activity. A novel Pd moiety confined thiadiazole-containing conjugated porous polymer was synthesized, and its catalytic performance was examined by coupling of aryl bromides with phenylboronic acids under mild conditions.![]()
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Affiliation(s)
- Yingjie Qian
- Department of Chemistry & Chemical Engineering
- Inha University
- Incheon 22212
- South Korea
| | - Sang Yung Jeong
- Department of Chemistry & Chemical Engineering
- Inha University
- Incheon 22212
- South Korea
| | - Sung-Hyeon Baeck
- Department of Chemistry & Chemical Engineering
- Inha University
- Incheon 22212
- South Korea
| | - Myung-Jong Jin
- Department of Chemistry & Chemical Engineering
- Inha University
- Incheon 22212
- South Korea
| | - Sang Eun Shim
- Department of Chemistry & Chemical Engineering
- Inha University
- Incheon 22212
- South Korea
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Kim M, Puthiaraj P, Qian Y, Kim Y, Jang S, Hwang S, Na E, Ahn WS, Shim SE. High performance carbon supercapacitor electrodes derived from a triazine-based covalent organic polymer with regular porosity. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.07.096] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kim Y, Kim M, Seong HG, Jung JY, Baeck SH, Shim SE. Roles of silica-coated layer on graphite for thermal conductivity, heat dissipation, thermal stability, and electrical resistivity of polymer composites. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.06.056] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kim Y, Hwang S, So JI, Kim CL, Kim M, Shim SE. Treatment of Atmospheric-Pressure Radio Frequency Plasma on Boron Nitride for Improving Thermal Conductivity of Polydimethylsiloxane Composites. Macromol Res 2018. [DOI: 10.1007/s13233-018-6120-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Hwang S, Ryu HJ, Kim Y, So JI, Jin SH, Baeck SH, Shim SE. Thermal Stability and Mechanical Properties of Silicone Rubber Composites Filled with Inorganic Fire-proof Fillers and Expandable Materials. pk 2018. [DOI: 10.7317/pk.2018.42.3.354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Ryu HJ, Hwang S, Kim Y, Jin SH, Baeck SH, Shim SE. Comparison of Properties of Silicone Rubber Containing Particulate and Fibrous Fire-proofing Fillers. pk 2017. [DOI: 10.7317/pk.2017.41.6.935] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Ju J, Kim M, Jang S, Kim Y, Choi Y, Baeck SH, Shim SE. 3D in-situ hollow carbon fiber/carbon nanosheet/Fe3C@Fe3O4 by solventless one-step synthesis and its superior supercapacitor performance. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.09.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Lee M, Kim Y, Ryu H, Baeck SH, Shim SE. Effects of Silane Coupling Agent on the Mechanical and Thermal Properties of Silica/Polypropylene Composites. pk 2017. [DOI: 10.7317/pk.2017.41.4.599] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Kim YG, Kim Y, Choi JK, Baeck SH, Shim SE. Preparation and Properties of Polypropylene/Thermoplastic Polyester Elastomer Blends. pk 2017. [DOI: 10.7317/pk.2017.41.3.514] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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30
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Ryu HJ, Cho ST, Kim YS, Baeck SH, Jin SH, Shim SE. Thermal and Physical Properties of Silicone Rubber Composites Filled with Inorganic Fire-proof Fillers. pk 2017. [DOI: 10.7317/pk.2017.41.3.425] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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31
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Mali SS, Inamdar AI, Im H, Shim SE, Hong CK. Correction: Efficient planar n-i-p type heterojunction flexible perovskite solar cells with sputtered TiO 2 electron transporting layers. Nanoscale 2017; 9:3655. [PMID: 28244541 DOI: 10.1039/c7nr90040f] [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] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Correction for 'Efficient planar n-i-p type heterojunction flexible perovskite solar cells with sputtered TiO2 electron transporting layers' by Sawanta S. Mali et al., Nanoscale, 2017, DOI: 10.1039/c6nr09032j.
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Affiliation(s)
- Sawanta S Mali
- Polymer Energy Materials Laboratory, School of Applied Chemical Engineering, Chonnam National University, Gwangju, 500-757, South Korea.
| | - A I Inamdar
- Department of Semiconductor Science, Dongguk University, Seoul 100-715, Republic of Korea
| | - Hyunsik Im
- Department of Semiconductor Science, Dongguk University, Seoul 100-715, Republic of Korea
| | - Sang Eun Shim
- Department of Chemistry & Chemical Engineering, Inha University, 100 Inha-ro, Namgu, Incheon 402-751, Republic of Korea
| | - Chang Kook Hong
- Polymer Energy Materials Laboratory, School of Applied Chemical Engineering, Chonnam National University, Gwangju, 500-757, South Korea.
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Mali SS, Hong CK, Inamdar AI, Im H, Shim SE. Efficient planar n-i-p type heterojunction flexible perovskite solar cells with sputtered TiO 2 electron transporting layers. Nanoscale 2017; 9:3095-3104. [PMID: 28195297 DOI: 10.1039/c6nr09032j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The development of hybrid organo-lead trihalide perovskite solar cells (PSCs) comprising an electron transporting layer (ETL), a perovskite light absorber and a hole transporting layer (HTL) has received significant attention for their potential in efficient PSCs. However, the preparation of a compact and uniform ETL and the formation of a uniform light absorber layer suffer from a high temperature processing treatment and the formation of unwanted perovskite islands, respectively. A low temperature/room temperature processed ETL is one of the best options for the fabrication of flexible PSCs. In the present work, we report the implementation of a room temperature processed compact TiO2 ETL and the synthesis of extremely uniform flexible planar PSCs based on methylammonium lead mixed halides MAPb(I1-xBrx)3 (x = 0.1) via RF-magnetron sputtering and a toluene dripping treatment, respectively. The compact TiO2 ETLs with different thicknesses (30 to 100 nm) were directly deposited on a flexible PET coated ITO substrate by varying the RF-sputtering time and used for the fabrication of flexible PSCs. The photovoltaic properties revealed that flexible PSC performance is strongly dependent on the TiO2 ETL thickness. The open circuit voltage (VOC) and fill factor (FF) are directly proportional to the TiO2 ETL thickness while the 50 nm thick TiO2 ETL shows the highest current density (JSC) of 20.77 mA cm-2. Our controlled results reveal that the room temperature RF-magnetron sputtered 50 nm-thick TiO2 ETL photoelectrode exhibits a power conversion efficiency (PCE) in excess of 15%. The use of room temperature synthesis of the compact TiO2 ETL by RF magnetron sputtering results in an enhancement of the device performance for cells prepared on flexible substrates. The champion flexible planar PSC based on this architecture exhibited a promising power conversion efficiency as high as 15.88%, featuring a high FF of 0.69 and VOC of 1.108 V with a negligible hysteresis under AM 1.5 G illumination. Furthermore, the mechanical bending stability revealed that the fabricated devices show stable PCE up to 200 bending cycles. The interface properties revealed that the 50 nm thick TiO2 ETL provides superior charge injection characteristics and low internal resistance. The present work provides a simplistic and reliable approach for the fabrication of highly efficient stable flexible perovskite solar cells.
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Affiliation(s)
- Sawanta S Mali
- Polymer Energy Materials Laboratory, School of Applied Chemical Engineering, Chonnam National University, Gwangju, 500-757, South Korea.
| | - Chang Kook Hong
- Polymer Energy Materials Laboratory, School of Applied Chemical Engineering, Chonnam National University, Gwangju, 500-757, South Korea.
| | - A I Inamdar
- Department of Semiconductor Science, Dongguk University, Seoul 100-715, Republic of Korea
| | - Hyunsik Im
- Department of Semiconductor Science, Dongguk University, Seoul 100-715, Republic of Korea
| | - Sang Eun Shim
- Department of Chemistry & Chemical Engineering, Inha University, 100 Inha-ro, Namgu, Incheon 402-751, Republic of Korea
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Kim Y, Qian Y, Kim M, Ju J, Baeck SH, Shim SE. A one-step process employing various amphiphiles for an electrically insulating silica coating on graphite. RSC Adv 2017. [DOI: 10.1039/c7ra03049e] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Herein, we report new way and mechanism to completely coat graphite (3–550 μm) with a silica layer within 12 hours.
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Affiliation(s)
- Yeongseon Kim
- Department of Chemistry & Chemical Engineering
- Inha University
- Republic of Korea
| | - Yingjie Qian
- Department of Chemistry & Chemical Engineering
- Inha University
- Republic of Korea
| | - Minjae Kim
- Department of Chemistry & Chemical Engineering
- Inha University
- Republic of Korea
| | - Jaechul Ju
- Department of Chemistry & Chemical Engineering
- Inha University
- Republic of Korea
| | - Sung-Hyeon Baeck
- Department of Chemistry & Chemical Engineering
- Inha University
- Republic of Korea
| | - Sang Eun Shim
- Department of Chemistry & Chemical Engineering
- Inha University
- Republic of Korea
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34
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Rheem MJ, Jung H, Ha J, Baeck SH, Shim SE. Suspension polymerization of thermally expandable microspheres using low-temperature initiators. Colloid Polym Sci 2016. [DOI: 10.1007/s00396-016-3993-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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35
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Mali SS, Kim H, Shim SE, Hong CK. A solution processed nanostructured p-type NiO electrode for efficient inverted perovskite solar cells. Nanoscale 2016; 8:19189-19194. [PMID: 27778014 DOI: 10.1039/c6nr06670d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Here we report a solution processed nanostructured NiO as a hole transport layer (HTL) for efficient inverted MAPb(I1-xBrx)3 (x = 0.3) perovskite solar cells (PSCs). The best performing p-i-n PSC exhibits 15.35% power conversion efficiency with a current density (JSC) of 19.85 mA cm-2, an open circuit voltage (VOC) of 1.056 V and a fill factor (FF) of 0.73. The developed method is simple and cost effective.
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Affiliation(s)
- Sawanta S Mali
- Polymer Energy Materials Laboratory, School of Applied Chemical Engineering, Chonnam National University, Gwangju, 500-757, Republic of Korea.
| | - Hyungjin Kim
- Polymer Energy Materials Laboratory, School of Applied Chemical Engineering, Chonnam National University, Gwangju, 500-757, Republic of Korea.
| | - Sang Eun Shim
- Department of Chemistry & chemical Engineering, Inha University, 100 Inha-ro, Namgu, Incheon 402-751, Republic of Korea
| | - Chang Kook Hong
- Polymer Energy Materials Laboratory, School of Applied Chemical Engineering, Chonnam National University, Gwangju, 500-757, Republic of Korea.
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Jeoung SK, Han IS, Jung YJ, Hong S, Shim SE, Hwang YJ, Lee PC, Ha JU. Fabrication of thermally expandable core-shell microcapsules using organic and inorganic stabilizers and their application. J Appl Polym Sci 2016. [DOI: 10.1002/app.44247] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sun Kyoung Jeoung
- Lightweight & Convergent Materials R&D Center, Korea Automotive Technology Institute; Chungnam 31214 South Korea
- Department of Mechanical and Industrial Engineering; Northeastern University; Boston 02115 Massachusett
| | - In Soo Han
- Department of Materials Science and Engineering; Korea University; Seoul 02841 South Korea
| | - Yung Jun Jung
- Department of Mechanical and Industrial Engineering; Northeastern University; Boston 02115 Massachusett
| | - Sanghyun Hong
- Department of Mechanical and Industrial Engineering; Northeastern University; Boston 02115 Massachusett
| | - Sang Eun Shim
- Department of Chemistry & Chemical Engineering; Inha University; Incheon 22212 South Korea
| | - Ye Jin Hwang
- Lightweight & Convergent Materials R&D Center, Korea Automotive Technology Institute; Chungnam 31214 South Korea
| | - Pyoung-Chan Lee
- Lightweight & Convergent Materials R&D Center, Korea Automotive Technology Institute; Chungnam 31214 South Korea
| | - Jin Uk Ha
- Lightweight & Convergent Materials R&D Center, Korea Automotive Technology Institute; Chungnam 31214 South Korea
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Jang J, Kim T, Choi YI, Park I, Lim D, Shim SE, Baeck SH. Preparation and Characterization of Nanostructured Manganese Oxide for Supercapacitors. J Nanosci Nanotechnol 2016; 16:5195-5199. [PMID: 27483899 DOI: 10.1166/jnn.2016.12274] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Nanostructured manganese oxides were synthesized by a sol-gel method using manganese acetate (MnAc2) and citric acid (C6H8O7,) as precursors, and characterized by Brunauer-Emmett-Teller (BET) analysis, Barrett-Joyner-Halenda (BJH), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The nano-rod structure of MnO2 developed gradually when the calcination temperature varied from 380 to 580 degrees C. As the pH increased, the pore size increased, while the specific surface area decreased. The effects of the pH and calcination temperature on the electrochemical properties of the nano-MnO2 electrode, including the supercapacitive behavior, were investigated by cyclic voltammetry (CV) tests. The tests were performed between 0 and 0.8 V versus Ag/AgCl in 1 M Na2SO4 electrolyte at various scan rates (10-200 mVs(-1)). The specific capacitance of the SP-380 sample, prepared at pH 6, was equal to 269.3 Fg(-1). After 300 cycles, approximately a 3.4% increase of the specific capacitance was measured, confirming the excellent cyclability.
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Hwang H, Lim D, Kim T, Lee D, Shim SE, Baeck SH. Electro-Catalytic Activity of RuO2-IrO2-Ta2O5 Mixed Metal Oxide Prepared by Spray Thermal Decomposition for Alkaline Water Electrolysis. j nanosci nanotechnol 2016; 16:4405-4410. [PMID: 27483764 DOI: 10.1166/jnn.2016.11001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Oxygen evolution reaction for alkaline water electrolysis was studied using various mixed metal oxide catalysts. Mixed metal oxide electrodes consisting of RuO2, IrO2, and Ta2O5 with various ratios on a titanium substrate were prepared by spray thermal decomposition. The crystallinity of the synthesized catalyst was investigated via X-ray diffraction, and the oxidation state of each component was determined using X-ray photoelectron spectroscopy (XPS). Surface morphology was investigated by scanning electron microscopy, and the roughness factor was determined by cyclic voltammetry (CV) in 1 M H2SO4. Electo-catalytic activity for oxygen evolution reaction was measured by cyclic voltammetry (CV) in 1 M KOH at room temperature, and it was found to be strongly dependent.on composition of catalyst. Among all electrodes tested, catalyst with a composition of Ru:Ir:Ta = 1:2:2.5 exhibited the highest current density of 100 mA cm(-2) at 1.67 V, corresponding to an overpotential of 0.44 V.
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Byun H, Kim Y, Jung H, Baeck SH, Ahn WS, Shim SE. Fabrication of macroporous carbon foam using glycol-derivatives as liquid templates. Macromol Res 2016. [DOI: 10.1007/s13233-016-4038-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Nam J, Kim Y, Kim K, Baeck SH, Park DW, Shim SE. Synthesis of Alumina-coated Graphite Using Polyvinylpyrrolidone via Sol-Gel Reaction. pk 2016. [DOI: 10.7317/pk.2016.40.1.109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Kim T, Kim GP, Jang J, Shim SE, Ahn WS, Baeck SH. An investigation on the selective hydrodealkylation of C9+ aromatics over alkali-treated Pt/H-ZSM-5 zeolites. Catal Sci Technol 2016. [DOI: 10.1039/c5cy02254a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This study demonstrates the excellent catalytic activities of alkali-treated Pt/H-ZSM-5 on selective hydrodealkylation of C9+ aromatics even at low temperature.
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Affiliation(s)
- Taewoo Kim
- Department of Chemistry and Chemical Engineering
- Center for Design and Applications of Molecular Catalysts
- Inha University
- Incheon 402-751
- Korea
| | - Gil-Pyo Kim
- Materials Science and Engineering Program & Texas Materials Institute
- The University of Texas at Austin
- Austin
- USA
| | - Jaeyong Jang
- Department of Chemistry and Chemical Engineering
- Center for Design and Applications of Molecular Catalysts
- Inha University
- Incheon 402-751
- Korea
| | - Sang Eun Shim
- Department of Chemistry and Chemical Engineering
- Center for Design and Applications of Molecular Catalysts
- Inha University
- Incheon 402-751
- Korea
| | - Wha-Seung Ahn
- Department of Chemistry and Chemical Engineering
- Center for Design and Applications of Molecular Catalysts
- Inha University
- Incheon 402-751
- Korea
| | - Sung-Hyeon Baeck
- Department of Chemistry and Chemical Engineering
- Center for Design and Applications of Molecular Catalysts
- Inha University
- Incheon 402-751
- Korea
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Park I, Jang J, Lim D, Kim T, Shim SE, Park SH, Baeck SH. Synthesis and Characterizations of Mn<sub>1+X</sub>Co<sub>2-X</sub>O<sub>4</sub> Solid Solution Catalysts for Highly Efficient Li/Air Secondary Battery. Journal of the Korean Electrochemical Society 2015. [DOI: 10.5229/jkes.2015.18.4.137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Kim T, Hwang H, Jang J, Park I, Shim SE, Baeck SH. Synthesis and Electrochemical Analyses of Manganese Oxides for Super-Capacitors. J Nanosci Nanotechnol 2015; 15:8890-8895. [PMID: 26726613 DOI: 10.1166/jnn.2015.11543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
δ-Phase and α-phase manganese oxides were prepared using a hydrothermal method and their electrochemical properties were characterized. The influence of calcination temperature on the properties of manganese oxides was studied. Crystallinities were studied by X-ray diffraction, and scanning and transmission electron microscopy were utilized to examine morphologies. Average pore sizes and specific surface areas of samples were analyzed using the Barret-Joyner-Halenda and Brunauer-Emmett-Teller methods, respectively. After calcination in the range 300 degrees C to 600 degrees C, changes in morphology and crystallinity were observed. The flower-like shape of as synthesized samples became nanorod-like and the δ-phase changed to the α-phase. These changes may have been due to the removal of water during calcination. Furthermore, a transition stage in which the two phases coexisted was observed. Synthesized manganese oxides were mixed with carbon by sonification, to increase electric conductivity and to induce a synergistic effect between pseudo-capacitor and electric double layer capacitor (EDLC). Specific capacitances and rate durability of each composite were investigated by cyclic voltammetry in 1 M Na2SO4 electrolyte at different scan rates. MnO2 calcined at 400 degrees C exhibited the highest capacitance, probably due to its high surface area and more porous structure.
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Park I, Kim H, Shim SE, Baeck SH. Performance Evaluation of Activated Carbon Nanofiber as Carbon Supports to Improve the Cyclability of Li-Air Batteries. J Nanosci Nanotechnol 2015; 15:9061-9065. [PMID: 26726643 DOI: 10.1166/jnn.2015.11572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This study addresses the effects of the pore structures of carbon materials used as cathodes for non-aqueous lithium-air batteries on cycle life. Carbon Nanofibers (CNFs) were synthesized by electrospinning polyacrylonitrile (PAN) and carbonization. The synthesized CNF was then converted to activated carbon nanofibers (ACNFs) under flowing CO2. The specific surface areas CNFs were increased on activation. ACNFs were arranged randomly to form a web-like structure providing both oxygen pathways and a means of discharging products. To examine the electrochemical properties of ACNF, charge-discharge tests were conducted using a Swagelok-type cell at a constant current density of 0.2 mA/cm2; impedance tests were also conducted. ACNF sheet electrodes had cycle lives of up to 50 cycles, which was attributed to high surface area and porosity, although overpotentials for both charge and discharge were high. This cycling performance showed that the pore structure of sheet ACNF is more suitable for the transport of oxygen and for the storage of discharge products than carbon powders.
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Lim D, Hwang H, Kim T, Shim SE, Baeck SH. Fabrication and Characterization of Amorphous Cobalt-Doped Molybdenum Sulfide for Hydrogen Evolution Reaction. J Nanosci Nanotechnol 2015; 15:8257-8262. [PMID: 26726498 DOI: 10.1166/jnn.2015.11441] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In the present study, hydrogen evolution reaction (HER) by alkaline water electrolysis was conducted without using a precious metal catalyst. We synthesized an amorphous cobalt-doped molybdenum sulfide by electrodeposition using different cobalt loadings. The amorphous Co-MoSx produced was characterized by scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The cobalt doping and sulfidation procedure resulted in the successful fabrication of a candidate catalyst for the catalytic hydrogen evolution in alkaline solution with high intrinsic activity. Cobalt incorporated amorphous MoSx exhibited 3 times higher HER activity than non-promoted MoSx.
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Affiliation(s)
- Jung-Yun Choi
- Department of Chemistry; Inha University; Incheon Korea
| | - Sang Eun Shim
- Department of Chemical Engineering; Inha University; Incheon Korea
| | - Soo-Jin Park
- Department of Chemistry; Inha University; Incheon Korea
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Kim Y, Kim M, Choi JK, Shim SE. Mechanical and Electrical Properties of PVA Nanocomposite Containing Sonochemically Modified MWCNT in Water. Polymer Korea 2015. [DOI: 10.7317/pk.2015.39.1.136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Bu JH, Kim Y, Ha JU, Shim SE. Suspension Polymerization of Thermally Expandable Microcapsules with Core-Shell Structure Using the SPG Emulsification Technique: Influence of Crosslinking Agents and Stabilizers. Polymer Korea 2015. [DOI: 10.7317/pk.2015.39.1.78] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Jung J, Lee KM, Baeck SH, Shim SE. Piezoresistive behavior of a stretchable carbon nanotube-interlayered poly(dimethylsiloxane) sheet with a wrinkled structure. RSC Adv 2015. [DOI: 10.1039/c5ra12928a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Piezoresistive behavior of a stretchable poly(dimethylsiloxane) sheet with an interlayer of carbon nanotube in it (CNT-interlayered PDMS) was investigated.
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Affiliation(s)
- Joonhoo Jung
- Department of Chemistry & Chemical Engineering
- Inha University
- Incheon
- 402-751 Republic of Korea
| | - Kyung Min Lee
- Department of Chemistry & Chemical Engineering
- Inha University
- Incheon
- 402-751 Republic of Korea
| | - Sung-Hyeon Baeck
- Department of Chemistry & Chemical Engineering
- Inha University
- Incheon
- 402-751 Republic of Korea
| | - Sang Eun Shim
- Department of Chemistry & Chemical Engineering
- Inha University
- Incheon
- 402-751 Republic of Korea
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