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An JG, Tran H, Kim D, Lee SM, Lee A, Ahn SK, Cho JS, Gwak J, Kim T, Jeong I, Park JH. Application of Bifacial Semitransparent CuInSe 2 Absorber to the Bottom Cell in Bifacial Semitransparent Perovskite/CuInSe 2 Tandem Solar Cell for Albedo Environment. Small 2024; 20:e2305796. [PMID: 37857585 DOI: 10.1002/smll.202305796] [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] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 10/05/2023] [Indexed: 10/21/2023]
Abstract
Although various types of bifacial solar cells exist, few studies have been conducted on bifacial semitransparent CuInSe2 solar cells (BS-CISe SCs) despite the attractive potential in power generation from both sides in an albedo environment. The optimized BS-CISe SCs with 300 and 800 nm-thick absorber via a streamlined single-stage co-evaporation process exhibit a power conversion efficiency (PCE) of 6.32% and 10.6%, respectively. When double-sided total 2.0 sun illumination is assumed in an albedo environment, the bifacial power generation densities (BPGD) of them increases to 9.41% and 13.9%. Four-terminal bifacial semitransparent tandem solar cells (4T-BST SCs) are fabricated to increase the BPGD by mechanically stacking a BS-perovskite (PVK) top cell on top of a BS-CISe bottom cell with the 300 and 800 nm-thick absorber layers. When summed up, the best top and bottom cell PCEs of the 4T-BST SC with 300 and 800 nm-thick BS-CISe SC are 18.8% and 21.1%, respectively. However, the practical BPGD values of the 4T-BST SC under total 2 sun illumination are interestingly 23.4% and 24.4%, respectively. This is because the BS-CISe bottom cell's thickness affects how much rear-side illumination is transmitted to the BS-PVK top cell, increasing its current density and BPGD.
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Affiliation(s)
- Jin Gi An
- Photovoltaics Research Department, Korea Institute of Energy Research (KIER), Daejeon, 34129, Republic of Korea
- Department of Electrical Engineering and Smart Grid Research Center, Jeonbuk National University, Jeonju, 54896, Republic of Korea
| | - Huyen Tran
- Department of Renewable Energy Engineering, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea
| | - Dongryeol Kim
- Photovoltaics Research Department, Korea Institute of Energy Research (KIER), Daejeon, 34129, Republic of Korea
| | - Sang Min Lee
- Photovoltaics Research Department, Korea Institute of Energy Research (KIER), Daejeon, 34129, Republic of Korea
| | - Ahreum Lee
- Photovoltaics Research Department, Korea Institute of Energy Research (KIER), Daejeon, 34129, Republic of Korea
| | - Seung Kyu Ahn
- Photovoltaics Research Department, Korea Institute of Energy Research (KIER), Daejeon, 34129, Republic of Korea
| | - Jun-Sik Cho
- Photovoltaics Research Department, Korea Institute of Energy Research (KIER), Daejeon, 34129, Republic of Korea
- Department of Renewable Energy Engineering, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea
| | - Jihye Gwak
- Photovoltaics Research Department, Korea Institute of Energy Research (KIER), Daejeon, 34129, Republic of Korea
- Department of Renewable Energy Engineering, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea
| | - TaeWan Kim
- Department of Electrical Engineering and Smart Grid Research Center, Jeonbuk National University, Jeonju, 54896, Republic of Korea
| | - Inyoung Jeong
- Photovoltaics Research Department, Korea Institute of Energy Research (KIER), Daejeon, 34129, Republic of Korea
| | - Joo Hyung Park
- Photovoltaics Research Department, Korea Institute of Energy Research (KIER), Daejeon, 34129, Republic of Korea
- Department of Renewable Energy Engineering, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea
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Lee C, Subiyanto I, Byun S, Han SO, Cho CH, Kim H. Enhanced Energy Density in All-in-One Device Integrating Si Solar Cell and Supercapacitor Using [BMIm]Cl/PVA Gel Electrolyte. ACS Omega 2024; 9:7255-7261. [PMID: 38371843 PMCID: PMC10870753 DOI: 10.1021/acsomega.3c09812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 01/16/2024] [Accepted: 01/19/2024] [Indexed: 02/20/2024]
Abstract
All-in-one systems integrating solar cells and supercapacitors have recently received significant attention because of their high efficiency and portability. Unlike conventional solar photovoltaics, which require external wiring to connect to a battery for energy storage, integrated devices with solar cells and supercapacitors share one electrode, eliminating wiring resistance and facilitating charge transfer. In this work, we designed and fabricated all-in-one devices by combining a silicon solar cell and a supercapacitor with polymer gel electrolytes. Our all-in-one devices incorporating H3PO4/PVA and [BMIm]Cl/PVA exhibited areal capacitances of 452.5 and 550 mF·cm -2 at 0.1 mA·cm-2, respectively, following 100 s of photocharging. Notably, the [BMIm]Cl/PVA-based all-in-one device demonstrated significantly higher maximum energy density and power density compared to both the H3PO4/PVA-based all-in-one device and the values reported in literature. In addition, the cyclic photocharge/galvanostatic discharge process for the [BMIm]Cl/PVA-based all-in-one device represented consistent retention of areal capacitance, affirming its stability across charge-discharge cycles. After 100 s of photocharging, the [BMIm]Cl/PVA-based all-in-one device achieved a total energy efficiency of 1.85%, surpassing the 1.45% efficiency observed in the device using H3PO4/PVA. These results provide valuable insights for the design of self-charging all-in-one devices for portable and wearable applications.
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Affiliation(s)
- Chung Lee
- Hydrogen
Convergence Materials Laboratory, Korea
Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea
- Graduate
School of Energy Science and Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Iyan Subiyanto
- Hydrogen
Convergence Materials Laboratory, Korea
Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea
- Energy
Engineering, University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
| | - Segi Byun
- Hydrogen
Convergence Materials Laboratory, Korea
Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea
| | - Seong Ok Han
- Hydrogen
Convergence Materials Laboratory, Korea
Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea
| | - Churl-Hee Cho
- Graduate
School of Energy Science and Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Hyunuk Kim
- Hydrogen
Convergence Materials Laboratory, Korea
Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea
- Graduate
School of Energy Science and Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
- Energy
Engineering, University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
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Kang SJ, Jung W, Gwon OH, Kim HS, Byun HR, Kim JY, Jang SG, Shin B, Kwon O, Cho B, Yim K, Yu YJ. Photo-Assisted Ferroelectric Domain Control for α-In 2 Se 3 Artificial Synapses Inspired by Spontaneous Internal Electric Fields. Small 2024:e2307346. [PMID: 38213011 DOI: 10.1002/smll.202307346] [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] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 12/17/2023] [Indexed: 01/13/2024]
Abstract
α-In2 Se3 semiconductor crystals realize artificial synapses by tuning in-plane and out-of-plane ferroelectricity with diverse avenues of electrical and optical pulses. While the electrically induced ferroelectricity of α-In2 Se3 shows synaptic memory operation, the optically assisted synaptic plasticity in α-In2 Se3 has also been preferred for polarization flipping enhancement. Here, the synaptic memory behavior of α-In2 Se3 is demonstrated by applying electrical gate voltages under white light. As a result, the induced internal electric field is identified at a polarization flipped conductance channel in α-In2 Se3 /hexagonal boron nitride (hBN) heterostructure ferroelectric field effect transistors (FeFETs) under white light and discuss the contribution of this built-in electric field on synapse characterization. The biased dipoles in α-In2 Se3 toward potentiation polarization direction by an enhanced internal built-in electric field under illumination of white light lead to improvement of linearity for long-term depression curves with proper electric spikes. Consequently, upon applying appropriate electric spikes to α-In2 Se3 /hBN FeFETs with illuminating white light, the recognition accuracy values significantly through the artificial learning simulation is elevated for discriminating hand-written digit number images.
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Affiliation(s)
- Seok-Ju Kang
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
- Institute of Quantum Systems, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
| | - Wonzee Jung
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
- Energy AI & Computational Science Laboratory, Korea Institute of Energy Research, Daejeon, 34129, Republic of Korea
| | - Oh Hun Gwon
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
| | - Han Seul Kim
- Department of Advanced Material Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju, Chungbuk, 28644, Republic of Korea
| | - Hye Ryung Byun
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
- Institute of Quantum Systems, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
| | - Jong Yun Kim
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
- Institute of Quantum Systems, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
| | - Seo Gyun Jang
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
| | - BeomKyu Shin
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
| | - Ojun Kwon
- Department of Advanced Material Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju, Chungbuk, 28644, Republic of Korea
| | - Byungjin Cho
- Department of Advanced Material Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju, Chungbuk, 28644, Republic of Korea
| | - Kanghoon Yim
- Energy AI & Computational Science Laboratory, Korea Institute of Energy Research, Daejeon, 34129, Republic of Korea
| | - Young-Jun Yu
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
- Institute of Quantum Systems, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
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Pham HM, Naqvi SDH, Tran H, Tran HV, Delda J, Hong S, Jeong I, Gwak J, Ahn S. Effects of the Electrical Properties of SnO 2 and C60 on the Carrier Transport Characteristics of p-i-n-Structured Semitransparent Perovskite Solar Cells. Nanomaterials (Basel) 2023; 13:3091. [PMID: 38132989 PMCID: PMC10745447 DOI: 10.3390/nano13243091] [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] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 11/28/2023] [Accepted: 12/01/2023] [Indexed: 12/23/2023]
Abstract
Recently, metal halide perovskite-based top cells have shown significant potential for use in inexpensive and high-performance tandem solar cells. In state-of-the-art p-i-n perovskite/Si tandem devices, atomic-layer-deposited SnO2 has been widely used as a buffer layer in the top cells because it enables conformal, pinhole-free, and highly transparent buffer layer formation. In this work, the effects of various electrical properties of SnO2 and C60 layers on the carrier transport characteristics and the performance of the final devices were investigated using a numerical simulation method, which was established based on real experimental data to increase the validity of the model. It was found that the band alignment at the SnO2/C60 interface does, indeed, have a significant impact on the electron transport. In addition, as a general design rule, it was suggested that at first, the conduction band offset (CBO) between C60 and SnO2 should be chosen so as not to be too negative. However, even in a case in which this CBO condition is not met, we would still have the means to improve the electron transport characteristics by increasing the doping density of at least one of the two layers of C60 and/or SnO2, which would enhance the built-in potential across the perovskite layer and the electron extraction at the C60/SnO2 interface.
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Affiliation(s)
- Hoang Minh Pham
- Photovoltaics Research Department, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea (J.D.); (I.J.)
- Department of Renewable Energy Engineering, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Syed Dildar Haider Naqvi
- Photovoltaics Research Department, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea (J.D.); (I.J.)
| | - Huyen Tran
- Photovoltaics Research Department, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea (J.D.); (I.J.)
- Department of Renewable Energy Engineering, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Hung Van Tran
- Photovoltaics Research Department, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea (J.D.); (I.J.)
- Department of Renewable Energy Engineering, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Jonabelle Delda
- Photovoltaics Research Department, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea (J.D.); (I.J.)
- Department of Renewable Energy Engineering, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Sungjun Hong
- Photovoltaics Research Department, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea (J.D.); (I.J.)
- Department of Renewable Energy Engineering, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Inyoung Jeong
- Photovoltaics Research Department, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea (J.D.); (I.J.)
| | - Jihye Gwak
- Photovoltaics Research Department, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea (J.D.); (I.J.)
- Department of Renewable Energy Engineering, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - SeJin Ahn
- Photovoltaics Research Department, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea (J.D.); (I.J.)
- Department of Renewable Energy Engineering, University of Science and Technology, Daejeon 34113, Republic of Korea
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Kea K, Han Y, Kim TK. Enhancing anomaly detection in distributed power systems using autoencoder-based federated learning. PLoS One 2023; 18:e0290337. [PMID: 37594957 PMCID: PMC10437833 DOI: 10.1371/journal.pone.0290337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 08/04/2023] [Indexed: 08/20/2023] Open
Abstract
The growing use of Internet-of-Things devices in electric power systems has resulted in increased complexity and flexibility, making monitoring power usage critical for effective system maintenance and detecting abnormal behavior. However, traditional anomalous power consumption detection methods struggle to handle the vast amounts of data generated by these devices. While deep learning and machine learning are effective in anomaly detection, they require significant amounts of training data collected on centralized servers. This centralized approach results in high response time delays and data leakage problems. To address these challenges, we propose an Autoencoder-based Federated Learning method that combines the AutoEncoder and Federated Learning networks to develop a high-accuracy algorithm for identifying anomalies of power consumption data in distributed power systems. The proposed method allows for decentralized training of anomaly detection models among IoT devices, reducing response time and eventually solving data leakage issues. Our experimental results demonstrate the effectiveness of the FLAE method in detecting anomalies without needing data transferring.
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Affiliation(s)
- Kimleang Kea
- Department of AI Convergence, Pukyong National University, Nam-gu, Busan, South Korea
| | - Youngsun Han
- Department of AI Convergence, Pukyong National University, Nam-gu, Busan, South Korea
| | - Tae-Kyung Kim
- Department of Computer & Information Technology, Incheon Jaeneung University, Dong-gu, Incheon, South Korea
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Thao NTT, Kim K, Ryu JH, An BS, Nayak AK, Jang JU, Na KH, Choi WY, Ali G, Chae KH, Akbar M, Chung KY, Cho HS, Park JH, Kim BH, Han H. Colossal Dielectric Perovskites of Calcium Copper Titanate (CaCu 3 Ti 4 O 12 ) with Low-Iridium Dopants Enables Ultrahigh Mass Activity for the Acidic Oxygen Evolution Reaction. Adv Sci (Weinh) 2023; 10:e2207695. [PMID: 36991522 DOI: 10.1002/advs.202207695] [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] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 03/09/2023] [Indexed: 06/04/2023]
Abstract
Oxygen evolution reaction (OER) under acidic conditions becomes of significant importance for the practical use of a proton exchange membrane (PEM) water electrolyzer. In particular, maximizing the mass activity of iridium (Ir) is one of the maiden issues. Herein, the authors discover that the Ir-doped calcium copper titanate (CaCu₃Ti₄O₁₂, CCTO) perovskite exhibits ultrahigh mass activity up to 1000 A gIr -1 for the acidic OER, which is 66 times higher than that of the benchmark catalyst, IrO2 . By substituting Ti with Ir in CCTO, metal-oxygen (M-O) covalency can be significantly increased leading to the reduced energy barrier for charge transfer. Further, highly polarizable CCTO perovskite referred to as "colossal dielectric", possesses low defect formation energy for oxygen vacancy inducing a high number of oxygen vacancies in Ir-doped CCTO (Ir-CCTO). Electron transfer occurs from the oxygen vacancies and Ti to the substituted Ir consequentially resulting in the electron-rich Ir and -deficient Ti sites. Thus, favorable adsorptions of oxygen intermediates can take place at Ti sites while the Ir ensures efficient charge supplies during OER, taking a top position of the volcano plot. Simultaneously, the introduced Ir dopants form nanoclusters at the surface of Ir-CCTO, which can boost catalytic activity for the acidic OER.
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Affiliation(s)
- Nguyen Thi Thu Thao
- Department of Energy Engineering, Konkuk University, 05029, 120 Neungdong-ro, Seoul, Republic of Korea
| | - Kwangsoo Kim
- Computational Science & Engineering Laboratory, Korea Institute of Energy Research, 34129, 152 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea
- Department of Chemical and Biomolecular Engineering, Yonsei University, 03722, 50 Yonsei-ro, Seoul, Republic of Korea
| | - Jeong Ho Ryu
- Department of Materials Science and Engineering, Korea National University of Transportation, 27469, 50 Daehak-ro, Chungju, Republic of Korea
| | - Byeong-Seon An
- Analysis Center for Energy Research, Korea Institute of Energy Research, 34129, 152 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea
| | - Arpan Kumar Nayak
- Department of Energy Engineering, Konkuk University, 05029, 120 Neungdong-ro, Seoul, Republic of Korea
| | - Jin Uk Jang
- Department of Energy Engineering, Konkuk University, 05029, 120 Neungdong-ro, Seoul, Republic of Korea
| | - Kyeong-Han Na
- Department of Metal and Materials Engineering, Gangneung-Wonju National University, 25457, 7 Jukheongil, Gangneung, Gangwon, Republic of Korea
- Smart Hydrogen Energy Center, Gangneung-Wonju National University, 25457, 7 Jukheongil, Gangneung, Gangwon, Republic of Korea
| | - Won-Youl Choi
- Department of Metal and Materials Engineering, Gangneung-Wonju National University, 25457, 7 Jukheongil, Gangneung, Gangwon, Republic of Korea
- Smart Hydrogen Energy Center, Gangneung-Wonju National University, 25457, 7 Jukheongil, Gangneung, Gangwon, Republic of Korea
| | - Ghulam Ali
- U.S.-Pakistan Center for Advanced Studies in Energy (USPCASE), National University of Sciences and Technology (NUST), H-12, Islamabad, Pakistan
| | - Keun Hwa Chae
- Advanced Analysis Center, Korea Institute of Science and Technology, 02792, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, Republic of Korea
| | - Muhammad Akbar
- Energy Storage Research Center, Korea Institute of Science and Technology, 02792, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, Republic of Korea
- Division of Energy and Environment Technology, KIST School, Korea University of Science and Technology, 02792, Seoul, Republic of Korea
| | - Kyung Yoon Chung
- Energy Storage Research Center, Korea Institute of Science and Technology, 02792, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, Republic of Korea
- Division of Energy and Environment Technology, KIST School, Korea University of Science and Technology, 02792, Seoul, Republic of Korea
| | - Hyun-Seok Cho
- Hydrogen Research Department, Korea Institute of Energy Research, 34129, 152 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea
| | - Jong Hyeok Park
- Computational Science & Engineering Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea
| | - Byung-Hyun Kim
- Computational Science & Engineering Laboratory, Korea Institute of Energy Research, 34129, 152 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea
| | - HyukSu Han
- Department of Energy Engineering, Konkuk University, 05029, 120 Neungdong-ro, Seoul, Republic of Korea
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Lee YA, Jang KY, Yoo J, Yim K, Jung W, Jung KN, Yoo CY, Cho Y, Lee J, Ryu MH, Shin H, Lee K, Yoon H. Three-Dimensional Flower-like MoS 2 Nanosheets Grown on Graphite as High-Performance Anode Materials for Fast-Charging Lithium-Ion Batteries. Materials (Basel) 2023; 16:ma16114016. [PMID: 37297150 DOI: 10.3390/ma16114016] [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] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 05/15/2023] [Accepted: 05/24/2023] [Indexed: 06/12/2023]
Abstract
The demand for fast-charging lithium-ion batteries (LIBs) with long cycle life is growing rapidly due to the increasing use of electric vehicles (EVs) and energy storage systems (ESSs). Meeting this demand requires the development of advanced anode materials with improved rate capabilities and cycling stability. Graphite is a widely used anode material for LIBs due to its stable cycling performance and high reversibility. However, the sluggish kinetics and lithium plating on the graphite anode during high-rate charging conditions hinder the development of fast-charging LIBs. In this work, we report on a facile hydrothermal method to achieve three-dimensional (3D) flower-like MoS2 nanosheets grown on the surface of graphite as anode materials with high capacity and high power for LIBs. The composite of artificial graphite decorated with varying amounts of MoS2 nanosheets, denoted as MoS2@AG composites, deliver excellent rate performance and cycling stability. The 20-MoS2@AG composite exhibits high reversible cycle stability (~463 mAh g-1 at 200 mA g-1 after 100 cycles), excellent rate capability, and a stable cycle life at the high current density of 1200 mA g-1 over 300 cycles. We demonstrate that the MoS2-nanosheets-decorated graphite composites synthesized via a simple method have significant potential for the development of fast-charging LIBs with improved rate capabilities and interfacial kinetics.
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Affiliation(s)
- Yeong A Lee
- Korea Institute of Energy Research (KIER), Daejeon 34129, Republic of Korea
- Graduate School of Energy Science and Technology (GEST), Chungnam National University, Daejeon 34134, Republic of Korea
| | - Kyu Yeon Jang
- Korea Institute of Energy Research (KIER), Daejeon 34129, Republic of Korea
- Department of Advanced Energy Technologies and System Engineering, Korea University of Science and Technology (UST), Daejeon 34113, Republic of Korea
| | - Jaeseop Yoo
- Graduate School of Energy Science and Technology (GEST), Chungnam National University, Daejeon 34134, Republic of Korea
| | - Kanghoon Yim
- Computational Science and Engineering Laboratory, Korea Institute of Energy Research (KIER), Daejeon 34129, Republic of Korea
| | - Wonzee Jung
- Computational Science and Engineering Laboratory, Korea Institute of Energy Research (KIER), Daejeon 34129, Republic of Korea
- Department of Physics, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Kyu-Nam Jung
- Korea Institute of Energy Research (KIER), Daejeon 34129, Republic of Korea
| | - Chung-Yul Yoo
- Department of Chemistry, Mokpo National University, Muan-gun 58554, Republic of Korea
| | - Younghyun Cho
- Department of Energy Systems, Soonchunhyang University, Asan 31538, Republic of Korea
| | - Jinhong Lee
- Korea Institute of Energy Research (KIER), Daejeon 34129, Republic of Korea
| | - Myung Hyun Ryu
- Korea Institute of Energy Research (KIER), Daejeon 34129, Republic of Korea
| | - Hyeyoung Shin
- Graduate School of Energy Science and Technology (GEST), Chungnam National University, Daejeon 34134, Republic of Korea
| | - Kyubock Lee
- Graduate School of Energy Science and Technology (GEST), Chungnam National University, Daejeon 34134, Republic of Korea
| | - Hana Yoon
- Korea Institute of Energy Research (KIER), Daejeon 34129, Republic of Korea
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Lee EH, Kim TW, Byun S, Seo DW, Hwang HJ, Yoon HC, Kim H, Ryi SK. Effect of air bubbling on electroless Pd plating for the practical application of hydrogen selective membranes. RSC Adv 2023; 13:14281-14290. [PMID: 37180008 PMCID: PMC10170241 DOI: 10.1039/d3ra01596c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 05/04/2023] [Indexed: 05/15/2023] Open
Abstract
In this study, an air bubbling electroless plating (ELP) method was newly developed for the production of Pd composite membranes. The air bubble ELP alleviated the concentration polarization of Pd ions, making it possible to achieve a plating yield of 99.9% in 1 h and form very fine Pd grains with a uniform layer of ∼4.7 μm. A membrane with a diameter of 25.4 mm and a length of 450 mm was produced by the air bubbling ELP, achieving a hydrogen permeation flux of 4.0 × 10-1 mol m-2 s-1 and selectivity of ∼10 000 at 723 K with a pressure difference of 100 kPa. To confirm the reproducibility, six membranes were produced by the same method and assembled in a membrane reactor module to produce high-purity hydrogen by ammonia decomposition. Hydrogen permeation flux and selectivity of the six membranes at 723 K with a pressure difference of 100 kPa were 3.6 × 10-1 mol m-2 s-1 and ∼8900, respectively. An ammonia decomposition test with an ammonia feed rate of 12 000 mL min-1 showed that the membrane reactor produced hydrogen with >99.999% purity and a production rate of 1.01 Nm3 h-1 at 748 K with a retentate stream gauge pressure of 150 kPa and a permeation stream vacuum of -10 kPa. The ammonia decomposition tests confirmed that the newly developed air bubbling ELP method affords several advantages, such as rapid production, high ELP efficiency, reproducibility, and practical applicability.
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Affiliation(s)
- Eun-Han Lee
- High Temperature Energy Conversion Laboratory, Korea Institute of Energy Research (KIER) 152 Gajeong-ro, Yuseong-gu Daejeon 34129 Republic of Korea +82-42-860-3133 +82-42-860-3155
- Department of Chemical and Biological Engineering, Yonsei University 50 Yonsei-ro, Seodaemun-gu Seoul 03722 Republic of Korea +82-2-2123-5753
| | - Tae-Woo Kim
- High Temperature Energy Conversion Laboratory, Korea Institute of Energy Research (KIER) 152 Gajeong-ro, Yuseong-gu Daejeon 34129 Republic of Korea +82-42-860-3133 +82-42-860-3155
- Department of Chemical and Biological Engineering, Yonsei University 50 Yonsei-ro, Seodaemun-gu Seoul 03722 Republic of Korea +82-2-2123-5753
| | - Segi Byun
- High Temperature Energy Conversion Laboratory, Korea Institute of Energy Research (KIER) 152 Gajeong-ro, Yuseong-gu Daejeon 34129 Republic of Korea +82-42-860-3133 +82-42-860-3155
| | - Doo-Won Seo
- High Temperature Energy Conversion Laboratory, Korea Institute of Energy Research (KIER) 152 Gajeong-ro, Yuseong-gu Daejeon 34129 Republic of Korea +82-42-860-3133 +82-42-860-3155
| | - Hyo-Jung Hwang
- High Temperature Energy Conversion Laboratory, Korea Institute of Energy Research (KIER) 152 Gajeong-ro, Yuseong-gu Daejeon 34129 Republic of Korea +82-42-860-3133 +82-42-860-3155
| | - Hyung-Chul Yoon
- Clean Fuel Research Laboratory, Korea Institute of Energy Research (KIER) 152 Gajeong-ro, Yuseong-gu Daejeon 34129 Republic of Korea
| | - Hansung Kim
- Department of Chemical and Biological Engineering, Yonsei University 50 Yonsei-ro, Seodaemun-gu Seoul 03722 Republic of Korea +82-2-2123-5753
| | - Shin-Kun Ryi
- High Temperature Energy Conversion Laboratory, Korea Institute of Energy Research (KIER) 152 Gajeong-ro, Yuseong-gu Daejeon 34129 Republic of Korea +82-42-860-3133 +82-42-860-3155
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9
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Park SS, Lee YG, Park SJ. Estimation of Inactivation time for the SARS-CoV-2 virus from the UV biometer in South Korea. Air Qual Atmos Health 2023; 16:1-17. [PMID: 37359390 PMCID: PMC10158692 DOI: 10.1007/s11869-023-01360-x] [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] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 04/13/2023] [Indexed: 06/28/2023]
Abstract
The coronavirus disease 2019 (COVID-19) is a result of the infection by "severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), and has caused various social and economic effects over the globe. As the SARS-CoV-2 is effectively inactivated by the exposure to the UV-B radiation (shorter than 315 nm), the exposure time for inactivation of the SARS-CoV-2 was estimated using the broadband UV observation instrument over 11 observation sites in South Korea. For the limitation of the UV biometer, which has limited spectral information, the coefficient for conversion from the erythemal UV (EUV) to the radiation for virus inactivation was adopted before estimating the inactivation time. The inactivation time of SARS-CoV-2 is significantly dependent on seasonal and diurnal variations due to the temporal variations of surface incident UV irradiance. The inactivation times in summer and winter were around 10 and 50 min, respectively. The inactivation time was unidentified during winter afternoons due to the weak spectral UV solar radiation in winter. As the estimation of inactivation time using broadband observation includes the uncertainty due to the conversion coefficient and the error due to the solar irradiance, the sensitivity analysis of the inactivation time estimation was also conducted by changing the UV irradiance.
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Affiliation(s)
- Sang Seo Park
- Department of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea
| | - Yun Gon Lee
- Atmospheric Sciences, Department of Astronomy, Space Science, and Geology, Chungnam National University, Daejeon, South Korea
| | - Sun Ju Park
- Atmospheric Sciences, Department of Astronomy, Space Science, and Geology, Chungnam National University, Daejeon, South Korea
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Lee YR, Lee WH, Lee SY, Lee J, Kim MS, Moon M, Park GW, Kim HS, Kim JI, Lee JS, Lee S. Regulation of Reactive Oxygen Species Promotes Growth and Carotenoid Production Under Autotrophic Conditions in Rhodobacter sphaeroides. Front Microbiol 2022; 13:847757. [PMID: 35295297 PMCID: PMC8920488 DOI: 10.3389/fmicb.2022.847757] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Accepted: 02/07/2022] [Indexed: 11/26/2022] Open
Abstract
Industrial demand for capture and utilization using microorganisms to reduce CO2, a major cause of global warming, is significantly increasing. Rhodobacter sphaeroides is a suitable strain for the process of converting CO2 into high-value materials because it can accept CO2 and has various metabolic pathways. However, it has been mainly studied for heterotrophic growth that uses sugars and organic acids as carbon sources, not autotrophic growth. Here, we report that the regulation of reactive oxygen species is critical for growth when using CO2 as a sole carbon source in R. sphaeroides. In general, the growth rate is much slower under autotrophic conditions compared to heterotrophic conditions. To improve this, we performed random mutagenesis using N-methyl-N’-nitro-N-nitrosoguanidine (NTG). As a result, we selected the YR-1 strain with a maximum specific growth rate (μ) 1.44 day–1 in the early growth phase, which has a 110% faster growth rate compared to the wild-type. Based on the transcriptome analysis, it was confirmed that the growth was more sensitive to reactive oxygen species under autotrophic conditions. In the YR-1 mutant, the endogenous contents of H2O2 levels and oxidative damage were reduced by 33.3 and 42.7% in the cells, respectively. Furthermore, we measured that concentrations of carotenoids, which are important antioxidants. The total carotenoid is produced 9.63 g/L in the YR-1 mutant, suggesting that the production is 1.7-fold higher than wild-type. Taken together, our observations indicate that controlling ROS promotes cell growth and carotenoid production under autotrophic conditions.
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Affiliation(s)
- Yu Rim Lee
- Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju, South Korea
- Interdisciplinary Program of Agriculture and Life Sciences, Chonnam National University, Gwangju, South Korea
| | - Won-Heong Lee
- Interdisciplinary Program of Agriculture and Life Sciences, Chonnam National University, Gwangju, South Korea
- Department of Integrative Food, Bioscience and Biotechnology, Chonnam National University, Gwangju, South Korea
| | - Soo Youn Lee
- Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju, South Korea
| | - Jiye Lee
- Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju, South Korea
| | - Min-Sik Kim
- Energy Resources Upcycling Research Laboratory, Korea Institute of Energy Research, Daejeon, South Korea
| | - Myounghoon Moon
- Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju, South Korea
| | - Gwon Woo Park
- Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju, South Korea
| | - Hui Su Kim
- Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju, South Korea
- Department of Advanced Chemicals and Engineering, Chonnam National University, Gwangju, South Korea
| | - Jeong-Il Kim
- Department of Integrative Food, Bioscience and Biotechnology, Chonnam National University, Gwangju, South Korea
| | - Jin-Suk Lee
- Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju, South Korea
| | - Sangmin Lee
- Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju, South Korea
- *Correspondence: Sangmin Lee,
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Yoo S, Yoon SW, Jung WN, Chung MH, Kim H, Jeong H, Yoo KH. Photothermal inactivation of universal viral particles by localized surface plasmon resonance mediated heating filter membrane. Sci Rep 2022; 12:1724. [PMID: 35110635 PMCID: PMC8810778 DOI: 10.1038/s41598-022-05738-2] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 01/11/2022] [Indexed: 11/23/2022] Open
Abstract
This study introduces localized surface plasmon resonance (L-SPR) mediated heating filter membrane (HFM) for inactivating universal viral particles by using the photothermal effect of plasmonic metal nanoparticles (NPs). Plasmonic metal NPs were coated onto filter membrane via a conventional spray-coating method. The surface temperature of the HFM could be controlled to approximately 40-60 °C at room temperature, owing to the photothermal effect of the gold (Au) NPs coated on them, under irradiation by visible light-emitting diodes. Due to the photothermal effect of the HFMs, the virus titer of H1Npdm09 was reduced by > 99.9%, the full inactivation time being < 10 min, confirming the 50% tissue culture infective dose (TCID50) assay. Crystal violet staining showed that the infectious samples with photothermal inactivation lost their infectivity against Mardin-Darby Canine Kidney cells. Moreover, photothermal inactivation could also be applied to reduce the infectivity of SARS-CoV-2, showing reduction rate of 99%. We used quantitative reverse transcription polymerase chain reaction (qRT-PCR) techniques to confirm the existence of viral genes on the surface of the HFM. The results of the TCID50 assay, crystal violet staining method, and qRT-PCR showed that the effective and immediate reduction in viral infectivity possibly originated from the denaturation or deformation of membrane proteins and components. This study provides a new, simple, and effective method to inactivate viral infectivity, leading to its potential application in various fields of indoor air quality control and medical science.
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Affiliation(s)
- Seunghwan Yoo
- Energy ICT Convergence Research Department, Energy Efficiency Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea
- Department of Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Sun-Woo Yoon
- Biotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
- University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon, 34114, Republic of Korea
| | - Woo-Nam Jung
- Advanced Combustion Power Lab., Energy Efficiency Research Division, Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea
- Department of Mechnical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Deajeon, 34141, Republic of Korea
| | - Moon Hyun Chung
- Energy ICT Convergence Research Department, Energy Efficiency Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea
- Department of Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Hyunjun Kim
- Energy ICT Convergence Research Department, Energy Efficiency Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea
| | - Hagkeun Jeong
- Energy Efficiency Research Division, Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea
| | - Kyung-Hwa Yoo
- Department of Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.
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12
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Kim KM, Kim GB, Lee BH, Jeon CH, Keum JH. Methane Gas Cofiring Effects on Combustion and NO x Emission in 550 MW Tangentially Fired Pulverized-Coal Boiler. ACS Omega 2021; 6:31132-31146. [PMID: 34841155 PMCID: PMC8613846 DOI: 10.1021/acsomega.1c04574] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Accepted: 09/29/2021] [Indexed: 06/13/2023]
Abstract
A shift from coal to liquefied natural gas for electricity generation can mitigate CO2 emissions and respond to the intermittent and variable characteristics of renewable energy. With this objective, numerical simulation was performed in this study to determine the optimal position of the methane injector and evaluate the achievable reduction in NO x emissions before applying methane cofiring to an existing 550 MW tangentially fired pulverized-coal boiler (Boryeong Unit 3). The combustion and NO x reduction in the furnace were intensively analyzed based on the methane cofiring rate (up to 40%). The optimal position of the methane injector was found to be inside the oil port based on the spatial distribution of NO x and the stoichiometric ratio along the furnace height. The NO x reduction rate was logarithmically proportional to the methane cofiring rate, and compared to the base case, a 69.8% reduction was achieved at the 40% cofiring rate. In addition, the fraction of unburned char at the boiler outlet was equivalent to that of the existing boiler as the increase in the flow rates of the close-coupled and separated overfire air improved fuel and air mixing. Simultaneously, methane cofiring led to a reduction in the total fuel loss and CO emissions. Finally, this study showed that the recommended optimum cofiring rate was 20% based on the furnace exit gas temperature. Under the 20% methane cofiring condition, the boiler achieved a 57.3% reduction in NO x emissions and a 7.4% improvement in fuel loss.
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Affiliation(s)
- Kang-Min Kim
- School
of Mechanical Engineering, Pusan National
University, Busan 46241, Republic of Korea
| | - Gyu-Bo Kim
- School
of Mechanical Engineering, Pusan National
University, Busan 46241, Republic of Korea
| | - Byoung-Hwa Lee
- School
of Mechanical Engineering, Pusan National
University, Busan 46241, Republic of Korea
| | - Chung-Hwan Jeon
- School
of Mechanical Engineering, Pusan National
University, Busan 46241, Republic of Korea
| | - Joon-Ho Keum
- Boryeong
Power Plant, Korea Midland Power Co., Ltd., Boryeong-si, Chungcheongnam-do 33408, Republic of Korea
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13
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Trinh VT, Jeong TY, Lee BH, Jeon CH. Comparative Study of the Synergistic Effects of Blending Raw/Torrefied Biomass and Vietnamese Anthracite Using Co-pyrolysis. ACS Omega 2021; 6:29171-29183. [PMID: 34746606 PMCID: PMC8567401 DOI: 10.1021/acsomega.1c04610] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 10/14/2021] [Indexed: 06/01/2023]
Abstract
Biomass can be upgraded via torrefaction, and torrefied kenaf (TK) is a fuel that allows blending with coal at high ratios. In the present study, raw kenaf (Hibiscus cannabinus L.) (RK) was torrefied at 523 K for 30 min and then mixed with Vietnamese anthracite (NinhBinh, NB) before co-pyrolysis. Thermogravimetric (TG) analysis was used to evaluate the behavior of RK, TK, and blended RK/TK during co-pyrolysis at biomass blending ratios (BBRs) of 0, 25, 50, 75, and 100 wt %. The TG and derivative thermogravimetry curves of a mixture of NB and RK (NBRK) were similar to those of RK. The decomposition curves of a mixture of NB and TK (NBTK) depended on the mass fraction of TK. Based on weight loss differences between the experimental and calculated data for the fuel blends, no interaction between the RK and anthracite was observed for all BBRs, whereas anthracite involving 50 and 75% TK exhibited synergistic effects. The temperature range for synergy and degree of synergy for NB and TK depended on the heating rate and mass ratio of TK. Kinetic parameters were calculated using the Friedman-non-isothermal free kinetic method at heating rates of 10, 20, and 40 K/min. The results showed that the activation energy (E) values of the NBRK at conversion ratios of 0.2-0.5 were equal to those of the RK, whereas they were superior at NB decomposition ratios of 0.6-0.8. NBTK1-1 (BBR of 50%) showed E values higher than those of NB at some conversion ratios, thus demonstrating a negative impact of blending. Further, NBTK1-3 (BBR of 75%) and NBTK3-1 (BBR of 25%) exhibited E values between those of NB and TK. The present study suggests that a high TK mass fraction (75%) in the blend for co-pyrolysis is optimal for the activation energy and volatile matter yield.
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Affiliation(s)
- Viet Thieu Trinh
- School
of Mechanical Engineering, Pusan National
University, 2, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan, 46241, Republic
of Korea
| | - Tae-Yong Jeong
- Pusan
Clean Energy Research Institute, Pusan National
University, 2, Busandaehak-ro
63 beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea
| | - Byoung-Hwa Lee
- Pusan
Clean Energy Research Institute, Pusan National
University, 2, Busandaehak-ro
63 beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea
| | - Chung-Hwan Jeon
- School
of Mechanical Engineering, Pusan National
University, 2, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan, 46241, Republic
of Korea
- Pusan
Clean Energy Research Institute, Pusan National
University, 2, Busandaehak-ro
63 beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea
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