Review
Chemistry, Physical
Jujia Zhang, Jin Zhang, Haining Wang, Yan Xiang, Shanfu Lu
Summary: High-temperature polymer electrolyte membrane fuel cells (HT-PEMFCs) have unique advantages, but the control of phosphoric acid content is crucial for their performance. The distribution and migration of phosphoric acid in the electrodes are influenced by various factors, requiring precise regulation in order to construct high-performance HT-PEMFCs.
ACTA PHYSICO-CHIMICA SINICA
(2021)
Article
Engineering, Environmental
Jung-Eun Cha, Seol Jang, Dong-Jun Seo, Jeemin Hwang, Min Ho Seo, Young-Woo Choi, Won Bae Kim
Summary: This article introduces a reinforced composite membrane with a two-layered asymmetric structure, which is fabricated by impregnating the Nafion on a porous polyethylene substrate. It both reduces the cost of the membrane used in proton exchange membrane fuel cells and enhances the performance of the cell.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
Le Vu Nam, Eunho Choi, Segeun Jang, Sang Moon Kim
Summary: Spatially locating uniformly patterned PTMPs on the surface of Nafion membrane can effectively improve the performance of proton exchange membrane fuel cells under high temperature and low humidity conditions.
Review
Chemistry, Physical
Yuan Duan, Huiyuan Liu, Weiqi Zhang, Lindiwe Khotseng, Qian Xu, Huaneng Su
Summary: This review focuses on the advancement of components and relative techniques of flexible polymer electrolyte membrane fuel cells (PEMFCs). It discusses the limitations of using conventional materials and techniques in flexible PEMFCs, and presents the performance and durability of flexible PEMFCs. Furthermore, it provides a brief perspective on the remaining challenges and future development of flexible PEMFCs.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Liyan Liu, Meihui Tan, Huiyuan Liu, Weiqi Zhang, Qian Xu, Khadijeh Hooshyari, Jiao Yu, Huaneng Su
Summary: A new composite support material, Nb4N5/C, was developed for high temperature polymer electrolyte membrane fuel cells (HT-PEMFCs). The addition of transition metal nitrides (TMNs) enhanced the stability of the catalyst and improved its performance in high temperature single-cell testing.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Yun Sik Kang, Segeun Jang, Eunho Choi, Sunhee Jo, Sang Moon Kim, Sung Jong Yoo
Summary: Improving the durability of PEMFCs by incorporating radical scavengers such as ceria into the MEA, especially the membrane, is crucial for further commercializing polymer electrolyte membrane fuel cells. A novel method of constructing a robust membrane by adding ultrathin ceria barriers to the outermost sides of a commercial Nafion membrane has been developed, leading to enhanced durability and proper areal density of CeO2 barriers. The decreased amount of fluoride ion emission and loss of proton conductivity with increasing CeO2 density suggest improved performance and durability of the modified membrane.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Review
Biochemistry & Molecular Biology
Seansoo Hwang, HyeonGyeong Lee, Yu-Gyeong Jeong, Chanhee Choi, Inhyeok Hwang, SeungHyeon Song, Sang Yong Nam, Jin Hong Lee, Kihyun Kim
Summary: In order to address the dependence on fossil fuels and global warming issues, research has focused on developing eco-friendly energy conversion devices. Polymer electrolyte membranes (PEMs), as a key component in PEMFCs, should have high proton conductivity and excellent physicochemical stability. Incorporating organic/inorganic fillers into the polymer matrix is an effective method to control the properties of the PEM.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Physical
R. Angayarkanni, Aristatil Ganesan, M. Dhelipan, S. Karthikeyan, N. Mani, P. Thiyagarajan
Summary: The fuel cell operated successfully without external humidification support by utilizing a novel silica composite layer, showing improved performance compared to a commercial catalyst MEA. The silica layer provided a well-humidified environment for proton transfer, demonstrating excellent electrochemical stability and durability in both dry and humidified gas conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Kazuto Suzuki, Manabu Tanaka, Masahiro Kuramochi, Shun Yamanouchi, Noriko Miyaguchi, Hiroyoshi Kawakami
Summary: Blend polymer nanofibers (BNF) composite membranes, consisting of sulfonated polyimide and polybenzimidazole blends doped with phytic acid, show high proton conductivity, mechanical and chemical stabilities, and low gas permeability. The proton conduction mechanism in the BNF composite membranes involves both vehicle mechanism and proton hopping conduction. Compared to the conventional Nafion NR211 membrane, the BNF composite membrane exhibits superior fuel cell performances at high humidity, low humidity, and high temperature/low humidity.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Physical
Jingwen Zhang, Hualong Ma, Jun Ma, Meixue Hu, Qihao Li, Sheng Chen, Tianshu Ning, Chuangxin Ge, Xi Liu, Li Xiao, Lin Zhuang, Yixiao Zhang, Liwei Chen
Summary: Alkaline polymer electrolyte fuel cells (APEFCs) are essential energy conversion devices for future renewable energy structures, but their overall performance and long-term stability need improvement. This study presents a fabrication method of a cone-shaped array on the surface of an alkaline polymer electrolyte membrane to improve the overall device performance.
ACTA PHYSICO-CHIMICA SINICA
(2023)
Article
Materials Science, Multidisciplinary
Eunho Choi, Sang Moon Kim, Segeun Jang
Summary: A single spray-coating method was used to develop a robust and free-standing reinforced Nafion composite membrane and electrodes. The optimized spray-coating process was determined through morphology analysis and a theoretical model based on the coverage of sprayed droplets. The fabricated reinforced membrane showed excellent mechanical properties and minimal proton-conducting loss, and the resulting MEA performed comparably to, and even better than, the one with commercial Nafion membrane after durability testing.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Review
Energy & Fuels
Nur Ain Masleeza Harun, Norazuwana Shaari, Zatil Amali Che Ramli
Summary: Fuel cells are the most promising alternative green and clean energy source in the future due to their low carbon emissions. Researchers have made efforts to develop materials that can reduce the cost of fuel cells. Graphitic carbon nitride (g-C3N4) is frequently mentioned in fuel cell applications because of its unique features.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Energy & Fuels
Yajie Song, Xinli Wang, Lei Wang, Fengwen Pan, Wenmiao Chen, Fuqiang Xi
Summary: A twin-nozzle ejector is proposed to improve hydrogen recirculation in the PEMFC system, with simulation results showing advantages and disadvantages of two working modes under different power outputs. This ejector can be used in a wider power output range and enhance system performance.
Article
Thermodynamics
Hao Yuan, Yuebang Dai, Hongkun Li, Yun Wang
Summary: This study proposes a three-dimensional nonisothermal model to explore the operation details and spatial variation of electrochemical reaction in high-temperature polymer electrolyte membrane (PEM) fuel cells. Numerical results reveal the spatial distributions of various parameters in PEM fuel cells and provide references for the design and optimization of fuel cell operation conditions.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Multidisciplinary
Hyeon-Seung Jung, Do-Hyung Kim, Hyunsoo Chun, Chanho Pak
Summary: The study investigates the effects of binder concentration and heat treatment temperature on the performance of membrane electrode assembly in high-temperature polymer electrolyte membrane fuel cells. Response surface methodology is applied to optimize the fabrication conditions based on statistical analysis. The results show that RSM can be used to optimize fabrication conditions with multiple variables.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Physical
Eom-Ji Kim, Jaewook Shin, Junu Bak, Sang Jae Lee, Ki hyun Kim, DongHoon Song, JeongHan Roh, Yongju Lee, HyoWon Kim, Kug-Seung Lee, EunAe Cho
Summary: The titanium oxide and molybdenum oxide composite can enhance the activity and durability of the catalyst, resulting in improved performance of the oxygen evolution reaction.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Jing Liu, Junu Bak, Jeonghan Roh, Kug-Seung Lee, Ara Cho, Jeong Woo Han, EunAe Cho
Summary: Efficient platinum single-atom (Pt-1) catalysts are sought after for reducing the costs of polymer electrolyte membrane (PEM) fuel cells. In this study, a Pt-based electrocatalyst was prepared by hydrothermal ethanol reduction method with high selectivity for the oxygen reduction pathway. Further reconstruction of the coordination environment led to the formation of highly efficient platinum single-atom active sites for oxygen reduction. The obtained catalyst demonstrated excellent performance and stability, outperforming commercial Pt/C by 8.7 times in mass activity at a cell voltage of 0.9 V.
Review
Chemistry, Multidisciplinary
Seungbum Hong, Chi Hao Liow, Jong Min Yuk, Hye Ryung Byon, Yongsoo Yang, EunAe Cho, Jiwon Yeom, Gun Park, Hyeonmuk Kang, Seunggu Kim, Yoonsu Shim, Moony Na, Chaehwa Jeong, Gyuseong Hwang, Hongjun Kim, Hoon Kim, Seongmun Eom, Seongwoo Cho, Hosun Jun, Yongju Lee, Arthur Baucour, Kihoon Bang, Myungjoon Kim, Seokjung Yun, Jeongjae Ryu, Youngjoon Han, Albina Jetybayeva, Pyuck-Pa Choi, Joshua C. Agar, Sergei Kalinin, Peter W. Voorhees, Peter Littlewood, Hyuck Mo Lee
Summary: Multiscale and multimodal imaging of material structures and properties provide a solid foundation for materials theory and design to flourish. The M3I3 initiative aims to reduce time for the discovery, design and development of materials based on quantifying and understanding multiscale processing-structure-property relationships. By combining machine learning and scientific insights, the vision of M3I3 can be realized through elucidating these relationships and material hierarchies.
Article
Chemistry, Multidisciplinary
Jaewook Shin, Hyeonmuk Kang, Yongju Lee, Sang Hyeon Ha, EunAe Cho
Summary: The thermal battery, a key source for powering defensive power systems, employs Li alloy-based anodes. However, the alloying reduces the working voltage and energy output. To overcome this, a novel core-shell electrode structure with high Li content in the core and low Li content in the shell has been developed, achieving a higher energy output.
Article
Chemistry, Physical
Jeonghoon Lim, Chanwon Jung, Doosun Hong, Junu Bak, Jaewook Shin, MinJoong Kim, DongHoon Song, Changsoo Lee, Jinkyu Lim, Hyunjoo Lee, Hyuck Mo Lee, EunAe Cho
Summary: In this study, structurally ordered Pt3Mn nanoparticles on a carbon support were introduced as a highly efficient and durable catalyst for the oxygen reduction reaction (ORR). The Pt3Mn intermetallic/C catalyst demonstrated superior ORR activity and stability compared to commercial Pt/C. DFT calculations and experimental results supported the high activity and stability of Pt3Mn.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Jaewook Shin, Tae-Hee Kim, Hyeonmuk Kang, EunAe Cho
Summary: To address the electrolyte decomposition issue of Si anodes in Li-ion batteries, researchers have improved the performance of Si by applying coatings, resulting in better cycling performance in the batteries. They demonstrated a low-cost wet-chemical method to coat an epitaxial metal-organic framework (HKUST-1) as an inorganic/organic hybrid coating on Si electrodes. The coating promotes the formation of a denser and thinner solid electrolyte interphase (SEI), reducing impedance and enhancing electrochemical cycling performance.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Physical
Chi Hao Liow, Hyeonmuk Kang, Seunggu Kim, Moony Na, Yongju Lee, Arthur Baucour, Kihoon Bang, Yoonsu Shim, Jacob Choe, Gyuseong Hwang, Seongwoo Cho, Gun Park, Jiwon Yeom, Joshua C. Agar, Jong Min Yuk, Jonghwa Shin, Hyuck Mo Lee, Hye Ryung Byon, EunAe Cho, Seungbum Hong
Summary: This study establishes a relationship between experimental parameters and performance using an inverse design surrogate model based on descriptors derived from expert conclusions. The model predicts design variables without the need for trial and error, serving as an effective strategy for cathode retrosynthesis.
Article
Chemistry, Physical
Sangwoo Kim, Ji-Won Jung, DongHoon Song, Su-Ho Cho, Jiyeon Kim, Jun Kyu Kim, DongHwan Oh, Hainan Sun, EunAe Cho, Il-Doo Kim, WooChul Jung
Summary: The lack of bifunctional features of perovskite oxide for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) limits its use as a cathode catalyst for rechargeable Zn-air batteries (ZABs). In this study, cobalt-based nanoparticle decorated Sr0.95Nb0.1Co0.7Fe0.2O3-delta (S0.95NCF) is presented as a novel air-electrode catalyst, achieving significantly enhanced activity for OER and ORR. The newly designed catalyst also exhibits remarkable charge/discharge durability, making it a promising candidate for ZABs cathode.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Correction
Chemistry, Multidisciplinary
Eom Ji Kim, Ki hyun Kim, Junu Bak, KwangHo Lee, EunAe Cho
Summary: This article presents a carbon nanotube-titanium dioxide nanocomposite support material for enhancing the activity and stability of an iridium catalyst in the oxygen evolution reaction.
Article
Chemistry, Multidisciplinary
Hyeonmuk Kang, Jaewook Shin, Tae-Hee Kim, Yongju Lee, Daehee Lee, Junho Lee, Gyungtae Kim, EunAe Cho
Summary: An interlayer composed of magnesium oxide nanoparticles and carbon matrix was introduced to improve the cycling performance of lithium sulfur (Li-S) batteries. The interlayer effectively captured and reutilized dissolved polysulfides, leading to higher initial capacity and capacity retention. By pyrolysis of a magnesium metal-organic framework, highly porous carbon with uniformly distributed magnesium oxide nanoparticles (MgO@C) was obtained and used as the interlayer. The Li-S cells with MgO@C interlayer showed superior performance compared to the cells without interlayer, demonstrating the effectiveness of the unique structure in anchoring and reutilizing polysulfides.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
HyunJin Jung, JaeHyuk Lee, JaeYun Park, Kyungjae Shin, Hee-Tak Kim, EunAe Cho
Summary: This study presents a composite electrode that reduces the electrochemical polarization in aqueous zinc-bromine flow batteries by providing a higher number of catalytically-active sites for faster bromine reaction. The composite electrode consists of conductive graphite felt and highly active tungsten oxynitride nanofibers. The addition of these nanofibers significantly improves reaction kinetics and ion diffusion.
Article
Chemistry, Physical
Kiung Jeon, SangJae Lee, Jong Min Kim, Sukkee Um, EunAe Cho, Yeon Sik Jung
Summary: Surface microstructuring of polymer electrolyte membranes (PEMs) can improve the performance of PEM fuel cells. Nanowell patterned membranes filled with carbon-supported platinum (Pt/C) exhibit the best performance, with higher current density and power density.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Yongkeun Kwon, Doosun Hong, Jue-Hyuk Jang, Minjoong Kim, Sekwon Oh, Donghoon Song, Jeonghoon Lim, Sung Jong Yoo, Eunae Cho
Summary: In the development of anion exchange membrane fuel cells (AEMFCs), the sluggish hydrogen oxidation reaction is a major challenge. The study suggests that the Ni-29Mo composite catalyst shows superior activity in the HOR, outperforming platinum catalysts and demonstrating practical applicability in AEMFCs.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Jeonghan Roh, Ara Cho, Sungjun Kim, Kug-Seung Lee, Jaewook Shin, Jin Seok Choi, Junu Bak, SangJae Lee, DongHoon Song, Eom-Ji Kim, Chaewon Lee, Young Rang Uhm, Yong-Hun Cho, Jeong Woo Han, EunAe Cho
Summary: Iron- and nitrogen-doped carbon (Fe-N-C) materials have been modified through phosphine-gas treatment to form FeN3PO active moiety, which enhances the catalytic performance of Fe-N-C in the oxygen reduction reaction (ORR) in both alkaline and acidic electrolytes. The proposed ORR mechanism based on FeN3PO moiety facilitates *OH desorption and is validated in anion exchange membrane fuel cells (AEMFCs) and proton exchange membrane fuel cells (PEMFCs).
Article
Chemistry, Multidisciplinary
Eom Ji Kim, Ki Hyun Kim, Junu Bak, KwangHo Lee, EunAe Cho
Summary: By synthesizing carbon nanotube and titanium dioxide nanocomposites as a high-performance support, the electrocatalytic activity and stability of iridium nanoparticle catalyst toward the oxygen evolution reaction can be improved. The carbon nanotubes serve as electron pathways, and the surface titanium dioxide layers protect them from corrosion. Compared to commercial catalysts, the iridium catalyst supported by this nanocomposite exhibits higher activity and stability.
