Article
Chemistry, Multidisciplinary
Liyue Zhang, Qiucheng Xu, Yanjie Hu, Ling Chen, Hao Jiang
Summary: This study evaluates the pH-stability relationship of four typical metal oxides as anode catalysts in AEMWE and screens out suitable transition metal oxides as alternatives to noble metal catalysts for green hydrogen production.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Dandan Guo, Hongmei Yu, Jun Chi, Yun Zhao, Zhigang Shao
Summary: In this study, a highly active self-supported Cu2S@NiFe layered double hydroxides nanosheets (LDHs) oxygen evolution reaction (OER) electrode (Cu2S@NiFe LDHs/Cu foam) with a three-dimensional (3D) multilayer hollow nanorod arrays structure was prepared. The electrode showed a significant OER performance with overpotentials of 230 and 286 mV at 50 and 100 mA cm(-2), respectively. An anion exchange membrane water electrolyzer (AEMWE) with the prepared electrode achieved a voltage of 1.56 V at a current density of 0.50 A cm(-2) and a stable operation for 300 h at the same current density.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Environmental
Sanghwi Han, Hyun S. Park, Jeyong Yoon
Summary: In this study, a sequential electrodeposited Co-based electrode supported on FeOxHy (Fe@Co) was reported as a superior anode catalyst in alkaline media for efficient and low-cost green hydrogen production. The Fe-based support played a crucial role in enhancing the OER performance, resulting in the highest OER activity compared to other support materials.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Deok-Hye Park, Min -Ha Kim, Myungjae Kim, Jeong-Hyeon Byeon, Jae -Sung Jang, Ji-Hwan Kim, Da-Mi Lim, Seon-Ha Park, Yun-Hui Gu, Jiwoong Kim, Kyung-Won Park
Summary: This study reports the synthesis and characterization of Ni-doped cobalt phosphide catalyst for the anode in anion exchange membrane water electrolysis (AEMWE). The Ni-doping was found to enhance the energy density and charge transfer rate, as well as reduce the energy barrier for OOH* formation, leading to improved electrocatalytic activity. The performance of the catalyst in a membrane-electrode-assembly configuration was evaluated.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
E. Lopez-Fernandez, J. Gil-Rostra, C. Escudero, I. J. Villar-Garcia, F. Yubero, A. de Lucas Consuegra, A. R. Gonzalez-Elipe
Summary: The optimization of catalysts in anion exchange membrane water electrolyzers is crucial for improving the activity of the oxygen evolution reaction. Research has shown that modifying the microstructure and chemical properties of mixed copper-cobalt oxide anodes can increase the reaction activity.
JOURNAL OF POWER SOURCES
(2021)
Review
Chemistry, Multidisciplinary
Deming Tan, Hao Xiong, Tao Zhang, Xuelin Fan, Junjie Wang, Fei Xu
Summary: The practical application of splitting water to generate hydrogen is hindered by the oxygen evolution reaction (OER) process. Noble-metal-free electrocatalysts have become increasingly significant for improving OER performance due to the high cost and scarcity of noble metals. This review introduces three types of electrolysis and evaluation criteria, followed by recent progress in designing and synthesizing noble-metal-free alkaline OER electrocatalysts, including metal oxides/(oxy)hydroxides, carbon-based materials, and metal/carbon hybrids. Perspectives on the future development of alkaline OER electrocatalysts are also provided.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Physical
Seo Hyun Park, Seung Jun Lee, Jae-Yeop Jeong, Hyunsoo Jin, Jun Seok Ha, Sung Jun Lee, In Tae Kim, Chiho Kim, Sookyung Kim, Mooki Bae, Hyunju Lee, Sung Mook Choi, Yangdo Kim, Yoo Sei Park
Summary: This work presents the synthesis of CuCo-hydroxide nano sheets via electrochemical co-precipitation and its application as an oxygen evolution reaction (OER) electrode in AEM water electrolyzers. The interaction between Cu and Co improves the electrode performance, leading to a high energy conversion efficiency of 73.5% for the AEM electrolyzer catalyzed by CuCo(OH)2.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Electrochemistry
Hui Min Tee, Habin Park, Parin N. N. Shah, Jamie A. A. Trindell, Joshua D. D. Sugar, Paul A. A. Kohl
Summary: Hydrogen produced through low-temperature water electrolysis using anion exchange membranes combines the benefits of liquid-electrolyte alkaline electrolysis and solid-polymer proton exchange membrane electrolysis. The study found that using cathode ionomers with high ion exchange capacity improved cathode durability, and using ionomers soluble in the spray-coated cathode ink further improved durability and reduced voltage.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Jooyoung Lee, Hyeonjung Jung, Yoo Sei Park, Nayoung Kwon, Seongwon Woo, N. Clament Sagaya Selvam, Gill Sang Han, Hyun Suk Jung, Pil J. Yoo, Sung Mook Choi, Jeong Woo Han, Byungkwon Lim
Summary: Developing high-efficiency and cost-efficient electrodes for hydrogen and oxygen evolution reactions is a major challenge in water electrolysis technology. A chemical transformation route was developed to produce high-performance OER and HER electrodes, which outperformed most other catalysts reported to date. An alkaline water electrolyzer based on these electrodes achieved a current density of 10 mA/cm(2) at an only 1.47 V-cell, while an anion exchange membrane water electrolyzer reached a current density of 500 mA/cm(2) at an only 1.75 V-cell.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Atif Khan Niaz, Adil Akhtar, Jun-Young Park, Hyung-Tae Lim
Summary: In this study, the effects of different operation modes on the stability of anion exchange membrane water electrolyzers (AEMWEs) were investigated. It was found that the short periodic operation mode led to performance degradation due to ohmic resistance, while the long periodic operation mode resulted in better stability with constant resistance values. The study suggests that even small operating factors like rest time frequency can have a significant impact on cell stability.
JOURNAL OF POWER SOURCES
(2021)
Article
Engineering, Environmental
Alessandra Carbone, Sabrina Campagna Zignani, Irene Gatto, Rolando Pedicini, Claudio Oldani, Alice Cattaneo, Antonio Salvatore Arico
Summary: Alkaline membrane water electrolysis using perfluorinated polymer as an alternative to hydrocarbon-based anion exchange membranes (AEMs) shows promising applications for green hydrogen production. The introduction of quaternary ammonium groups onto Aquivion (R) perfluorinated backbone through a simple two-step functionalization reaction using a low toxicity dispersant is successful. The formed AEM exhibits enhanced ion dissociation and shows only limited degradation of functional groups in alkaline solution, making it suitable for electrolysis with high current density and low degradation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Engineering, Environmental
Bowen Yang, Zhang Cunman
Summary: Hydrogen is a promising energy carrier for decarbonization. Anion exchange membrane (AEM) is a critical component for AEMWE and AEMFC, and understanding its molecular structure, physical property, and chemical micro-environment is essential for rational design and development of AEM technology. This review comprehensively summarizes the wide scope of AEM category, investigates AEM ionic conductivity and durability, and highlights the research progress and bottleneck issues in the AEM community.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Dexin Xu, Jing Yao, Xinzhi Ma, Yan Xiao, Chi Zhang, Wei Lin, Hong Gao
Summary: In this study, self-supported F, N codoping CoP nanosheets were prepared as efficient and stable bifunctional electrocatalysts for hydrogen and oxygen evolution reactions. The electronic structure of metal phosphides was adjusted using a double anion codoping strategy, leading to improved electrocatalytic activity. This work provides a reference for the rational design of efficient bifunctional electrocatalysts.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Environmental
Yoo Sei Park, Youngtae Park, Myeong Je Jang, Jooyoung Lee, Chiho Kim, Moon Gyu Park, Juchan Yang, Jungwoo Choi, Hyuck Mo Lee, Sung Mook Choi
Summary: We demonstrated the synergistic effects of intrinsic and extrinsic engineering on the performance of CuCo oxide for anion exchange membrane (AEM) electrolyzers. Intrinsic improvement was achieved by replacing Cu with Co3O4 (P-CCO), resulting in superior catalytic activity for the oxygen evolution reaction (OER). Extrinsic improvement was achieved by fabricating Z-CCO with a larger electrochemical surface area and improved OER catalytic activity through surface morphology engineering using a metal-organic framework (MOF). These improvements significantly enhanced the performance of the AEM electrolyzer, with the intrinsically improved Z-CCO exhibiting the highest energy efficiency.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Yoo Sei Park, Fan Liu, David Diercks, Dakota Braaten, Bin Liu, Chuancheng Duan
Summary: An efficient AEM electrolyzer was achieved by developing a CeO2/CoFeCe-layered double hydroxide heterostructure as the OER catalyst, which exhibited exceptional performance due to the synergistic effect between Ce doping and the CeO2/CoFeCe LDH interface.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Applied
Chiho Kim, Seong Hyun Kim, Seunghun Lee, Ilyeong Kwon, Seong Hyun Kim, Shinho Kim, Changgyu Seok, Yoo Sei Park, Yangdo Kim
Summary: The study developed sulfur-incorporated nickel iron (oxy)hydroxide nanosheets as a bifunctional electrocatalyst, which exhibited enhanced catalytic activity for the hydrogen evolution reaction and oxygen evolution reaction in alkaline electrolyte. This material showed promising potential for large-scale industrial hydrogen production with its low cost, high activity, and durability, as well as the opportunity for developing effective and feasible solar power systems in the future.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Zhixiao Xu, Song Jin, Nianji Zhang, Wenjing Deng, Min Ho Seo, Xiaolei Wang
Summary: By synthesizing an oxygen- and nitrogen-codoped carbon superstructure, the efficient host for high-DOD Zn metal anodes was created. The flower-shaped carbon (C-flower) host with microscale 3D hierarchical structures and zincophilic heteroatom dopants can guide Zn nucleation and growth, enabling horizontal plating with high Coulombic efficiency and long life.
Article
Multidisciplinary Sciences
Jinhyuck Ahn, Yoo Sei Park, Sanghyeon Lee, Juchan Yang, Jaeyeon Pyo, Jooyoung Lee, Geul Han Kim, Sung Mook Choi, Seung Kwon Seol
Summary: This study presents an effective strategy for the fabrication of highly active three-dimensional (3D)-printed NiFe-layered double hydroxide (LDH) pyramid electrode for oxygen evolution reaction (OER). The 3D-printed NiFe-LDH pyramid electrode shows improved OER activity and durability compared to traditional electrodes.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Xuzi Zhang, Song Jin, Min Ho Seo, Chaoqun Shang, Guofu Zhou, Xin Wang, Ge Li
Summary: This study successfully suppressed the growth of lithium dendrites in the anode by constructing a unique porous structure. The chemical bonding between Cu3P/CoP heterostructures and lithium atoms was found to regulate the plating behavior of lithium. The graphene composite anode designed in this study exhibited high cycling efficiency, low voltage hysteresis, and long lifespan.
Article
Chemistry, Multidisciplinary
Lee Seul Oh, Minseon Park, Yoo Sei Park, Youngmin Kim, Wongeun Yoon, Jeemin Hwang, Eunho Lim, Jong Hyeok Park, Sung Mook Choi, Min Ho Seo, Won Bae Kim, Hyung Ju Kim
Summary: Both experimental and computational methods are used in this work to investigate the effect of electrochemically-synthesized CuCo-oxide, Cu-oxide, and Co-oxide catalysts on the glycerol oxidation reaction. The Cu-based oxides show enhanced ability in cleaving C-C bonds, leading to high selectivity for glycolic acid and formic acid production, compared to the conventional Au and Pt catalysts.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Yoo Sei Park, Fan Liu, David Diercks, Dakota Braaten, Bin Liu, Chuancheng Duan
Summary: An efficient AEM electrolyzer was achieved by developing a CeO2/CoFeCe-layered double hydroxide heterostructure as the OER catalyst, which exhibited exceptional performance due to the synergistic effect between Ce doping and the CeO2/CoFeCe LDH interface.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Applied
Yoo Sei Park, Jae-Yeop Jeong, Myeong Je Jang, Chae-Yeon Kwon, Geul Han Kim, Jaehoon Jeong, Ji-hoon Lee, Jooyoung Lee, Sung Mook Choi
Summary: In this study, a ternary layered double hydroxide (LDH) OER electrocatalyst (NiFeCo-LDH) is developed for high-performance AEM alkaline seawater electrolyzers. The NiFeCo-LDH electrocatalyst greatly improves the kinetics of the AEM alkaline seawater electrolyzer, leading to high seawater electrolysis performance and hydrogen production efficiency.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Sukhwa Hong, Kahyun Ham, Jeemin Hwang, Sinwoo Kang, Min Ho Seo, Young-Woo Choi, Byungchan Han, Jaeyoung Lee, Kangwoo Cho
Summary: In this study, a highly efficient and stable oxygen evolution reaction (OER) electrocatalyst is developed by using scalable solution casting method to deposit doped nanoparticles on Ni foam. Advanced X-ray absorption spectroscopy and density functional theory calculations reveal the changes in catalytic active sites, providing new insights for precious-metal doped Ni-Fe oxide electrocatalysts.
ADVANCED FUNCTIONAL MATERIALS
(2023)
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
Engineering, Environmental
Di Chen, Yoo Sei Park, Fan Liu, Liyang Fang, Chuancheng Duan
Summary: This study demonstrates a novel class of hybrid perovskite materials that can serve as highly active and platinum group metal-free electrocatalysts for the oxygen evolution reaction, enabling low-cost and clean hydrogen production.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Ayon Karmakar, Thillai Govindaraja Senthamaraikannan, Erdenebayar Baasanjav, Parthasarathi Bandyopadhyay, Bo Jin, Yoo Sei Park, Dong-Hee Lim, Sang Mun Jeong
Summary: The present report introduces a one-step reflux method to produce gram-scale nickel cobalt molybdate hydrate (NCMH) nanostructured rods. Experimental and theoretical investigations demonstrate the superior electrocatalytic oxygen evolution reaction (OER) performance of NCMH, attributed to the promotion of hydroxyl functionalities on its surface. Furthermore, the NCMH anode in a single cell anion exchange membrane (AEM) water electrolyzer outperforms the commercial IrO2 anode, showing high current density and stable performance.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Engineering, Environmental
Yoo Sei Park, Youngtae Park, Myeong Je Jang, Jooyoung Lee, Chiho Kim, Moon Gyu Park, Juchan Yang, Jungwoo Choi, Hyuck Mo Lee, Sung Mook Choi
Summary: We demonstrated the synergistic effects of intrinsic and extrinsic engineering on the performance of CuCo oxide for anion exchange membrane (AEM) electrolyzers. Intrinsic improvement was achieved by replacing Cu with Co3O4 (P-CCO), resulting in superior catalytic activity for the oxygen evolution reaction (OER). Extrinsic improvement was achieved by fabricating Z-CCO with a larger electrochemical surface area and improved OER catalytic activity through surface morphology engineering using a metal-organic framework (MOF). These improvements significantly enhanced the performance of the AEM electrolyzer, with the intrinsically improved Z-CCO exhibiting the highest energy efficiency.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
In Tae Kim, Sang-Hyun Kim, Jun Seok Ha, Tae Ha Kim, Jungho Cho, Gi Dae Park, Yoo Sei Park
Summary: In this study, an oxygen deficient yolk-shell structured Co3O4 was developed as the oxygen evolution reaction electrocatalyst for anion exchange membrane water electrolyzers (AEMWEs). The yolk-shell structure provided a large surface area, and the introduction of oxygen vacancies enhanced the OER activity. The abundant voids facilitated mass transport and reduced mass transport loss, resulting in excellent performance at high current density. This work suggests that yolk-shell structured electrocatalysts can effectively improve the performance of AEMWEs and overcome the current obstacle to commercialization.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Jae-Yeop Jeong, Yoo Sei Park, Jaehoon Jeong, Kyung-Bok Lee, Dohyung Kim, Ki-Yong Yoon, Han-Seam Park, Juchan Yang
Summary: We have successfully prepared a non-precious metal catalyst through a simple preparation method, and modified it to exhibit good electrocatalytic performance and durability under alkaline conditions. Additionally, this electrocatalyst has shown similar performance and durability in alkaline wastewater.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
