as of September. 2025
130. Jong-Hyeok Park, Jiyoung Heo, Hyun S. Park, Jin-soo Park, "Solvent-driven morphologial and electrochemical enhancements in catalyst layers for proton exchange membrane water electrolysis", J. Power Sources (657) 238110 (2025).
129. Chaekyung Baik, Jihyun Choi, Dayoung Kwon, Chaeyeon Yang, Suji Lee, Yung-Eun Sung,* Wooyul Kim,* Hyun S. Park,* “Efficient and Stable 40 W-class Low-temperature NH3 Electrolyzers for Intermittent H2 Production”, submitted (2025).
128. Myeong-Geun Kim, Sourabh Chougule, Suji Lee, Young Sang Park, Albert S. Lee,* Hyun S. Park,* Namgee Jung,* Sung Jong Yoo*, “Carbon Shell-Encapsulated PtFe Catalysts in HT-PEMFCs: Balancing Molecular Sieving and Diffusion for Enhanced Reactant Access”, under review (2025).
127. Jihyun Choi, Myeong-Geun Kim, Dong Wook Lee, Chaekyung Baik, Jong-Seok Park, Suji Lee, Chaeyeon Yang, Yung-Eun Sung, Sung Jong Yoo, Hyun S. Park*, “Low-temperature electrocatalytic ammonia production: Study on the nitrogen-reducing activity of vanadium sulfide catalysts”, under revision (2025).
126. Muhammad Mara Ikhsan, Chaeyon Yang, Kamal Ghotia, Franz Egert, Syed-Asif Ansar, Mikkel Rykær Kraglund, David Aili, Hyun S. Park, Fatemeh Razmjooei, Dirk Henkensmeier, “Low-Alkalinity Ion Solvating Membrane Water Electrolysis (LA ISMWE)”, Nature Energy, accepted (2024).
125. Gyu Seong Yi, Bohyun Jo, Yung-Eun Sung, Taekyung Yu, Hyun S. Park*, “Facet-Selective Bromide Adsorption at High-index Facets of Copper Sulfides for Improved Electrochemical Nitrogen Reduction Activity and Selectivity”, J. Electrochem. Sci. Tech. accepted (2025).
124. Katie Heeyun Lim, Jungsoo Hwang, Jihyun Kim, Hyung-Juhn Kim, Dirk Henkensmeier, Sung Jong Yoo, Jin Young Kim, So Young Lee, Hee-Young Park, Young-Gi Yoon, Tae-Young Kim, Chi-Young Jung, Hyun S. Park*, Jong Hyun Jang*,“Transfer-enhanced cathode with noncorrosive inorganic-based composite additive for durable proton exchange membrane fuel cells”, J. Power Sources (15) 237063 (2025).
123. Ahyoun Lim, Kahyun Ham, Thomas Quast, Suji Lee, Marc F. Tesch, Steffen Czioska, Wolfgang Schuhmann, Jan-Dierk Grunwaldt, Sung Ki Cho, Hee-Young Park, Jong Hyun Jang, Sang Hyun Ahn, Ioannis Spanos, Hyun S. Park*, “Limited Surface Oxide Growth as a Prerequisite for Stabilizing Low-loading Iridium Electrode for PEM Water Electrolysis”, ACS Catalysis (15) 6098-6113 (2025)
122. Jinkyu Park, Hakyung Min, Dayoung Kwon, Liangliang Xu, Chaekyung Baik, Jihyun Choi, Hyun S. Park*, Wooyul Kim, Jinwoo Lee, "Selectively stabilized *NH intermediates on Pt-skins by L12-Pt3Zn intermetallic core via self-generated template strategy for high performance ammonia oxidation", submitted (2025)
121. Suji Lee, Chaeyeon Yang, Jimin Kong, Jihyun Choi, Dong Wook Lee, Ahyoun Lim, Jong Hyun Jang, Haneul Jin, Yung-Eun Sung, Hyun S. Park*, "Factors in the Utilization of Corrosive Ruthenium in the Oxygen Evolution Electrode of Polymer Electrolyte Membrane Water Electrolysis", Journal of Materials Chemistry A, (13) 18017-19022 (2025)-Front cover (2025)
120. Jihyun Choi, Cun Liu, Yung-Eun Sung, Hyun S. Park*, Taekyung Yu, “Au-added CuS Hollow Spheres to Regulate the Strength and Active Area of N2 Adsorption Sites for Electrochemical NH3 Production”, ACS Appl. Mater. Interfaces (17) 3116-3126 (2025) – Back Cover
119. Ohsub Kim, Sung Jong Yoo, Jin Young Kim, Sung Ki Cho, Hyun S. Park, So Young Lee, Bora Seo, Jong Hyun Jang, Katie Heeyum Lim, Hee-Young Park, “Impact of fuel starvation–induced anode carbon corrosion in proton exchange membrane fuel cells on the structure of the membrane electrode assembly and exhaust gas emissions: A quantitative case study “, J. Power Sources (615) 235032 (2024).
118. In Gyeom Kim, Sung Jong Yoo, Jin Young Kim, Hyun S. Park, So Young Lee, Bora Seo, Kwan-Young Lee, Jong Hyun Jang, Hee-Young Park, “A Review of Strategies to Improve the Stability of Carbonsupported PtNi Octahedral for Cathode Electrocatalysts in Polymer Electrolyte Membrane Fuel Cells“, J. Electrochem. Sci. Technol. (15) 96 (2024)
117. Hye Young Jung, Yong Seok Jun, Kwan-Young Lee, Sung Ki Cho, Hyun S. Park, Jong Hyun Jang, “Effect of Ramping Rate on the Durability of Proton Exchange Membrane Water Electrolysis During Dynamic Operation Using Triangular Voltage Cycling”, J. Electrochem. Sci. Technol. (15) 253 (2024)
116. 박현서, “수소, 지속 가능성의 새로운 조건”, vol. 38, Skeptic Korea (2024)
115. Hongju Hong, Sangyeon Jeong, Jae Hun Seol, Taekyung Kim, Seong Chan Cho, Taekyung Lee, Chaeyoen Yang, Hionsuck Baik, Hyun S. Park, Eunsoo Lee, Sung Jong Yoo, Sang Uck Lee, Kwangyeol Lee, “Ru2P/Ir2P Heterostructure Promotes Hydrogen Spillover for Efficient Alkaline Hydrogen Evolution Reaction”, Advanced Energy Materials (14) 2401426 (2024)
114. Hee Soo Kim, Ahyoun Lim, Mino Woo, Hae In Lee, Yunjang Gu, Dong-Ha Lim, "Micro Flower-Like Hierarchical Mo2C/Co@NC (N-doped Carbon) for Efficiency Bifunctional Electrocatalyst", Korean Journal of Chemical Engineering, Korean Journal of Chemical Engineering (41) 187 (2024).-Acknowledged.
113. Asridin Dayan, Muhammad Luthfi Akbar Trisno, Mikkel Rykær Kraglund, Mads Radmer Almind, Johan Hjelm, Jens Oluf Jensen, David Aili, Hyun S. Park, Dirk Henkensmeier, “Quaternary ammonium-free membranes for ion solvating membrane water electrolysis with 1 M KOH”, Advanced Energy Materials (13) 2302966 (2023).
112. 박현서, 성영은, “전기화학의 동향과 전망”, 학문연구의 동향과 쟁점-제 13집, 대한민국학술원 (2023)
111. Ye Eun Jo, Da Yeong Yu, Jaewon Lee, Gyu Seong Yi, Hyun S. Park, Sung Ki Cho, "Role of Liquid Metal Catalysts in Electrochemical Growth of Si from SiO2 in CaCl2-based Molten Salt: Enhancement of Crystallization and Purification", ACS Applied Energy Materials (6) 8081 (2023).
110. Sanghwi Han, Hyun S. Park,* Jeyong Yoon, “Superior performance of an anion exchange membrane water electrolyzer: sequential electrodeposited Co-based oxygen evolution catalyst”, Chemical Engineering Journal (477) 146713 (2023).
109. Jimin Kong, Hansung Kim, Hyun S. Park*, " Electrochemical NH3 Production: In-situ Evaluation of the Activity and Durability of Nitrogen Reduction Catalysis using Scanning Electrochemical Microscopy (SECM)", Applied Catalysis B:Environmental (338) 123019 (2023).
107. Jimin Kong, Jihyun Choi, Hyun S. Park*, “Advantages and Limitations of Different Electrochemical NH3 Production Methods under Ambient Conditions: A Review“, Current Opinion in Electrochemistry (39) 101292 (2023).-invited
106. Malikah Najibah, Jimin Kong, Hamza Khalid, Jarom Hnat, Hyun S. Park, Karel Bouzek, Dirk Henkensmeier, “Pre-swelling of FAA3 membranes with ethylene glycol to minimize dimensional changes after assembly into a water electrolyser: Effect on properties and performance”, Journal of Membrane Science (670) 121344 (2023).
105. Ye Ji Kim, Ahyoun Lim, Gyu Rac Lee, Minjoon Kim, Jin Young Kim, Jong Min Kim, Yeon Sik Jung, Hyun S. Park*, “Design of Bifunctional Electrode with Enhanced Hydrogen and Water Oxidation Kinetics and Mass Transportations in Unitized Regenerative Fuel Cell”, Advanced Functional Materials 202302586 (2023).
104. Hye Young Jung, Yongseok Jun, Kwan-Young Lee, Hyun S. Park*, Sung Ki Cho, Jong Hyun Jang, “Comparative Study on the Organic Solvent of IrO2–Ionomer Inks used for Spray Coating of Anode for Proton Exchange Membrane Water Electrolysis”, Journal of Electrochemical Science and Technology (14) 283 (2023).
103. Hui-Yun Jeong, Jinho Oh, Gyu Seong Yi, Hee-Young Park, Sung Ki Cho, Jong Hyun Jang, Sung Jong Yoo*, Hyun S. Park*, “High–performance water electrolyzer with minimum platinum group metal usage: Iron nitride–iridium oxide core–shell nanostructures for stable and efficient oxygen evolution reaction”, Applied Catalysis B:Environmental (330) 122596 (2023).
102. Hamza Khalid, Malikah Najibah, Hyun S. Park, Chulsung Bae, Dirk Henkensmeier, “Properties of Anion Exchange Membranes with a Focus on Water Electrolysis”, Membranes (12) 989 (2022).
101. Cun Liu, Ilpyo Roh, Hyun S. Park, Bum Jun Park, and Taekyung Yu, “IrPt Alloy Nanoparticles with Controllable Compositions as Catalysts for Electrochemical Oxygen and Hydrogen Evolution”, ACS Applied Nano Materials (5) 17152-17158 (2022).
100. Haneul Jin, Hee Soo Kim, Chi Ho Lee, Yongju Hong, Jihyun Choi, Hionsuck Baik, Sang Uck Lee, Sung Jong Yoo, Kwangyeol Lee, Hyun S. Park*, “Directing the Surface Atomic Geometry on Copper Sulfide for Enhanced Electrochemical Nitrogen Reduction”, ACS Catalysis (12) 13638-13648 (2022).-Front Cover
Muhammad Luthfi Akbar Trisno, Su Ji Lee, Franz Egert, Jens Oluf Jensen, David Aili, Aleksandra Roznowska, Artur Michalak, Hyun S. Park, Fatemeh Razmjooei, Syed-Asif Ansar, Dirk Henkensmeier, “Reinforced gel-state polybenzimidazole membranes for alkaline water electrolysis”, Energy and Environmental Science (15) 4362-4375 (2022).
Hee Soo Kim, Haneul Jin, Seung-hoon Kim, Jihyun Cho, Dong Wook Lee, Hyung Chul Ham, Sung Jong Yoo, Hyun S. Park*, “A Sacrificial Dopant to Enhance Activity and Durability of Electrochemical N2 Reduction Catalysis”, ACS Catalysis (12) 5684-5697 (2022).
Youngseung Na, Min Gwan Ha, Hyun S. Park, Hee Young Park, Hyung-Juhn Kim, Dirk Henkensmeier, Sung Jong Yoo, Jin Young Kim, So Young Lee, Jong Hyun Jang, “The effect of dual flow channel structures on electro-chemical CO2 reduction in proton exchange membrane electrolyzers”, Frontiers (10) 943113 (2022).
Min Gwan Ha, Donghoon Shin, Jaewoo Jung, Emilio Audasso, Juhun Song, Yong-Tae Kim, Hee-Young Park, Hyun S. Park, Youngseung Na, Jong Hyun Jang, “Electrochemical Impedance Characteristics of a Low-Temperature Single Cell for CO2/H2O Co-Reduction to Produce Syngas (CO+H2)”, J. Electrochem. Sci. Technol. (13) 462-471 (2022).
Juwon Jeong, Jiwoo Choi, Seguen Jang, Heejong Shin, Sungjun Kim, Junghwan Jang, Hyun S. Park*, Mansoo Choi*, Yung-Eun Sung*, “In situ Fabrication of Highly Porous Foam-like Zn Nanostructures on Gas Diffusion Layer for Selective Electrocatalytic Reduction of Carbon dioxide to Carbon Monoxide”, Journal of Industrial and Engineering Chemistry (113) 325-331 (2022).
Haneul Jin, Songa Choi, Gi Joo Bang, Taehyun Kwon, Hee Soo Kim, Su Ji Lee, Yongju Hong, Dong Wook Lee, Hyun S. Park, Hionsuck Baik, Yousung Jung, Sung Jong Yoo, Kwangyeol Lee, “Safeguarding RuO2 phase against lattice oxygen oxidation during acidic water electrooxidation”, Energy Environ. Sci. (15) 1119-1130 (2022).
Chi-Yeong Ahn, Ji Eun Park, Sungjun Kim, Ok-Hee Kim, Wonchan Hwang, Min Her, Sun Young Kang, SungBin Park, Oh Joong Kwon, Hyun S. Park, Yong-Hun Cho, and Yung-Eun Sung, ”Differences in the electrochemical performance of Pt-based catalysts used for polymer electrolyte membrane fuel cells in liquid half- and full-cells”, Chemical Reviews (121) 15075-15140 (2021).
Malikah Najibah, Ekaterina Tsoy, Hamza Khalid, Yongfang Chen, Qingfeng Li, Chulsung Bae, Jaromír Hn´at, Michaela Plevov´a, Karel Bouzek, Jong Hyun Jang, Hyun S. Park, Dirk Henkensmeier, “PBI nanofiber mat-reinforced anion exchange membranes with covalently linked interfaces for use in water electrolysers”, Journal of Membrane Science (640) 119832 (2021)
Hui-Yun Jeong, Dong-gun Kim, Shedrack G. Akpe, Vinod Kumar Paidi, Hyun S. Park, Soo-Hyoung Lee, Kug-Seung Lee, Hyung Chul Ham, Pil Kim, Sung Jong Yoo, “Surface Hydrogen Oxidation-Mediated Pt Shell Formation on Ni3N Nanoparticles for Enhanced ORR Activity“, ACS Appl. Mater. Interfaces (13) 24624–24633 (2021).
Changhyeok Choi, Geun ho Gu, Juhwan Noh, Hyun S. Park, Yousung Jung, “Understanding Potential-dependent Competition Between Electrocatalytic Dinitrogen and Proton Reduction Reactions”, Nature Communications (12) 4353 (2021).
Ahyoun Lim, Ju Sung Lee, Suji Lee, So Young Lee, Hyoung-juhn Kim, Sung Jong Yoo, Jong Hyun Jang, Yung-Eun Sung, Hyun S. Park*, “Polymer Electrolyte Membrane Unitized Regenerative Fuel Cells: Operational Considerations for Achieving High Round Trip Efficiency at Low Catalyst Loading”, Applied Catalysis B: Environmental (297) 120458 (2021).
Ki Ro Yoon, Chang Kyu Hwang, Seung-hoon Kim, Ji-Won Jung, Ji Eon Chae, Ahyoun Lim, Su-Ho Cho, Jitendra Pal Singh, Jong Min Kim, Kihyun Shin, Byung Moo Moon, Hyun S. Park, Hyung-Juhn Kim, Keun Hwa Chae, Hyung Chul Ham, Il-Doo Kim, Jin Young Kim, “Hierarchically assembled cobalt oxynitride and N-doped carbon nanofiber hybrids for efficient bifunctional oxygen electrocatalysis with excepitional regenerative efficiency”, ACS Nano (15) 11218-11230 (2021).
Min Gwan Ha, Youngseung Na, Hee Young Park, Hyoung-Juhn Kim, Juhun Song, Sung Jong Yoo, Yong-Tae Kim, Hyun S. Park*, Jong Hyun Jang, “Combined effect of catholyte gapç and cell voltage on syngas ratio in continuous CO2/H2O co-electrolysis”, Journal of Electrochemical Science and Technology, accepted (2021).
Juwon Jeong, Jin Soo Kang, Heejong Shin, Soo Hong Lee, Junghwan Jang, Taeghwan Hyeon, Hyun S. Park*, Yung-Eun Sung, “Self-Supported Mesoscopic Tin Oxide Nanofilms for Electrocatalytic Reduction of Carbon Dioxide to Formate”, Chem. Comm. (57) 3445-3448 (2021)– front cover.
Ji Eon Chae, So Young Lee, Sung Jong Yoo, Jin Young Kim, Jong Hyun Jang, Hee-Young Park, Hyun S. Park, Dirk Henkensmeier, Kwang Ho Song, Hyoung-Juhn Kim, “Polystyrene-Based Hydroxide Ion–Conducting Ionomer: Binder Properties and Performance in Anion-Exchange Membrane Fuel Cells”, Polymers (13) 690 (2021).
Jimin Kong, Min-Seok Kim, Ramavi Akbar, Han Sung Kim, Kahyun Hur, Hyun S. Park*, “Tafel Analysis of Electrochemical Nitrogen Reduction Reactions on a Copper Sulfide Cataylst for NH3 Synthesis at Low Temperature and Atmospheric Pressure”, ACS Appl. Mater. Interfaces (13) 24593-24603 (2021) -front cover.
Mingyu Lee, Semin Kim, Minsoo Jang, Hyun S. Park, Jae Young Lee, “One-Pot Electrochemical Fabrication of High Performance Amperometric Enzymatic Biosensors Using Polypyrrole and Polydopamine”, J. Ind. Eng. Chem. (97) 316-325 (2021).
Kyungjung Kwon, Kang Hee Lee, Dong Ho Um, Seon-ah Jin, Hyun S. Park, Jinwon Cho, Jinho Hyun, Hyung Chul Ham, Chanho Pak, “Elucidation of durability of carbon-supported PdIr alloy catalyst by experimental and theoretical approaches in polymer electrolyte membrane fuel cell”, J. Ind. Eng. Chem. (97) 280-286 (2021).
Ahyoun Lim, Hui-Yun Jeong, Youngjoon Lim, Jin Young Kim, Hee Young Park, Jong Hyun Jang, Yung-Eun Sung*, Jong Min Kim*, Hyun S. Park*, “Amphiphilic Ti Porous Transport Layer for Highly Efficient PEM Unitized Regenerative Fuel Cells”, Science Advances (7) eabf7866 (2021).
Jihyun Choi, Hee Soo Kim, Jimin Kong, Han Sung Kim*, Sung Jong Yoo*, Hyun S. Park*, “Regenerative Electrocatalytic Redox Cycle of Copper Sulfide for Sustainable NH3 Production Under Ambient Conditions”, ACS Catalysis (11) 435-445 (2021).
Jeong Hyun Oh, Gyeong Ho Han, Hyunki Kim, Ho Won Jang, Hyun S. Park, Soo Young Kim, Sang Hyun Ahn, “Activity and stability of Ir-based gas diffusion electrode for proton exchange membrane water electrolyzer”, Chemical Engineering Journal (15) 127696 (2021).
Ara Jo, Sungwon Kim, Hyanjoo Park, Jong Hyun Jang*, Hyun S. Park*, “Enhanced Electrochemical Conversion of CO2 to CO at Bimetallic Ag-Zn Catalysts Formed on Polypyrrole-coated Electrode”, Journal of Catalysis (393) 92-99 (2021).
Ji Eun Park, Junghwan Kim, Jusung Han, Kihyun Kim, SungBin Park, Sunjun Kim, Hyun S. Park, Yong-Hun Cho, Jong-Chan Lee, Yung-Eun Sung, “High-performance proton-exchange membrane water electrolysis using a sulfonated Poly(arylene ether sulfone) membrane and ionomer”, J. Membr. Sci. (620) 118871 (2020).
N. Nambi Krishnan, Ngoc My Hanh Duong, Anastasiia Konovalova, Jong Hyun Jang, Hyun S. Park, Hyoung Juhn Kim, Aleksandra Roznowska, Artur Michalak, Dirk Henkensmeier, “Polybenzimidazole / tetrazole-modified poly(arylene ether) blend membranes for high temperature proton exchange membrane fuel cells”, J. Membr. Sci. (614) 118494 (2020).
Hyunki Kim, Junhyeong Kim, Jooyoung Kim, Gyeong Ho Han, Wenwu Guo, Seokjin Hong, Hyun S. Park, Ho Won Jang, Soo Young Kim, Sang Hyun Ahn, “Dendritic gold-supported iridium/iridium oxide ultra-low loading electrodes for high performance proton exchange membrane water electrolyzer”, Applied Catalysis B: Environmental (283) 119596 (2021).
Min Suc Cha, Ji Eun Park, Sungjun Kim, Seung-Hui Han, Sang-Hun Shin, Seok Whan Yang, Tae-Ho Kim, Duk Man Yu, Soonyong So, Young Taik Hong, Sang Jun Yoon, Sun Young Kang, Ok-Hee Kim, Hyun S. Park, Byungchan Bae, Yung-Eun Sung, Yong-Hun Cho, Jang Yong Lee, “Poly(carbazole)-based anion-conducting materials with high performance and durability for energy conversion devices”, Energy & Environmental Science (13) 3633-3645 (2020).
Min-Cheol Kim, Hyunji Nam, Jihyun Choi, Hee Soo Kim, Hong Woo Lee, Donghun Kim, Jimin Kong, Sang Soo Han*, Seung Yong Lee*, Hyun S. Park*, “Hydrogen Bonding-Mediated Enhancement of Biomimetic Electrochemical Nitrogen Reduction on Cu2-xS Catalysts”, ACS Catalysis, (10) 10577-10584 (2020).
Ye Ji Kim, Jong Min Kim, Ahyoun Lim, Hyeuk Jin Han, Moohyun Kim, Ki Ung Jeon, Gun Ho Lee, Gyu Rac Lee, Keun Hwa Chae, Eugene N Cho, Hyun S. Park, Jin Young Kim, Yeon Sik Jung, “Three-dimensionally Ordered Nanowire Stacks Achieve Ultra-high Mass Activity for Oxygen Evolution Reaction via Efficient Oxygen Transport”, Nature Communications, (11) 4921 (2020).
Chang Seob Kim, Jeawoo Jung, Jong Hyun Jang, Hyoung-Juhn Kim, Hyun S. Park, Jeong Won Kang, Youngseung Na, Hee-Young Park, “Micro Fluidic Structure Selection of Metal Mesh Combinations for Proton Exchange Membrane Fuel Cells Air Supply Enhancement”, Int. J. Hydrog. Energy (45)32808-32815 (2020).
Jaewoo Jung, Hyun S. Park, Jonghee Han, Hyoung-Juhn Kim, Dirk Henkensmeier, Sung Jong Yoo, Jin Young Kim, So Young Lee, Kwang Ho Song, Hee-Young Park, Jong Hyun Jang, “Effect of the fabrication condition of membrane electrode assemblies with carbon-supported ordered PtCo electrocatalyst on the durability of polymer electrolyte membrane fuel cells”, Int. J. Hydrog. Energy (45) 32834-32843 (2020).
Ahyoun Lim, Junyoung Kim, Hye Jin Lee, Hyoung-Juhn Kim, Sung Jong Yoo, Jong Hyun Jang, Hee Young Park, Yung-Eun Sung*, Hyun S. Park*, “Low-loading IrO2 Supported on Pt for Catalysis of PEM Water Electrolysis and Regenerative Fuel Cells”, Applied Catalysis B: Environmental (272) 118955 (2020).
So Young Lee, Ji Eon Chae, Jieun Choi, Hyun S. Park, Dirk Henkensmeier, Sung Jong Yoo, Jin Young Kim, Youngseung Na, Jong Hyun Jang, Hyoung-Juhn Kim, “Dual exchange membrane fuel cell with sequentially aligned cation and anion exchange membranes for non-humidified operation”, J. Membrane Sci. (596) 117745 (2019).
Byung Chul Yoo, Jimin Kong, Donghun Kim, William A. Goddard III, Hyun S. Park*, Sang Soo Han*, “Origin of the Catalytic Activity Trend of Transition Metals for Electrochemical Nitrogen Reduction”, J. Phys. Chem. C, (123) 31026-31031 (2019).
N. Nambi Krishnan, Anastasiia Konovalova, David Aili, Qing feng Li, Hyun S. Park, Jong Hyun Jang, Hyoung-Juhn Kim, Dirk Henkensmeier, “Thermally crosslinked sulfonated polybenzimidazole membranes and their performance in high temperature polymer electrolyte fuel cells”, J. Mem. Sci., (588) 117218 (2019).
Min-Seok Kim, Haedong Park, Sung Ok Won, Aditya Sharma, Jimin Kong, Hyun S. Park, Yun-Mo Sung, Tae Joon Park, Myoung-Woon Moon, Kahyun Hur, ”Copper-halide polymer nanowires as versatile supports for single-atom catalysts”, Small, (15) 1903197 (2019).
Ahyoun Lim, Hyoung-Juhn Kim, Dirk Henkensmeier, Sung Jong Yoo, Jin Young Kim, So Young Lee, Jong Hyun Jang, Hyun S. Park*, Yung-Eun Sung*, “A Study on Electrode Fabrication and Operation Variables Affecting the Performance of Anion Exchange Membrane Water Electrolysis”, J. Ind. Eng. Chem. (76) 410-418 (2019).
Young-Hoon Chung, Min Gwan Ha, In Young Cha, Youngseung Na, Min Wook Chung, Hyoung-Juhn Kim, Dirk Henkensmeier, Sung Jong Yoo, Jin Young Kim, So Young Lee, Hyun S. Park*, Yong-Tae Kim*, Jong Hyun Jang*, “Polyethylenimine-assisted Synthesis of Au Nanoparticles for Enhanced Electrochemical CO2 Reduction Reaction”, Electroanalysis, (31) 1401-1408 (2019).
Won-Hee Lee, Jinseok Jang, Hyun S. Park, Ki Min Nam, Sung Ki Cho, " Photoelectrochemical response of Au-decorated CuBi2O4 photocathode in bicarbonate solution”, J. Electroanal. Chem., (838) 172-177 (2019).
Semin Kim, Yohan Jang, Minsu Jang, Sungbum Cho, Ahyoun Lim, Jong-ho Lee, John Hardy, Hyun S. Park, Jae Young Lee, “Versatile biomimetic conductive polypyrrole synthesized with hyaluronic acid of different molecular weights”, Acta Biomater., (80) 258-268 (2018).
Jinwon Cho, Injoon Jang, Hyun S. Park, Sun Hee Choi, Jong Hyun Jang, Hyoung Juhn Kim, Sung Pil Yoon, Sung Jong Yoo, Hyung Chul Ham, “Computational and experimental design of active and durable Ir-based nanoalloy for electrochemical oxygen reduction reaction”, Applied Catalysis B: Environmental, (235) 117-185 (2018).
Anastasiia Konovalova, Hyemi Kim, Sangwon Kim, Ahyoun Lim, Hyun S. Park, Mikkel Rykaer Kraglund, David Aili, Jong Hyun Jang, Hyoung-Juhn Kim, Dirk Henkensmeier, “Blend Membrane of Polybenzimidazole and an anion exchange ionomer (FAA3) for Alkaline Water Electrolysis: Improved Alkaline Stability and Conductivity”, J. Membr. Sci., (564) 653-662 (2018).
Jeawoo Jung, Young-Hoon Chung, Hee-Young Park, Jonghee Han, Hyoung-Juhn Kim, Dirk Henkensmeier, Sung Jong Yoo, Jin Young Kim, So Young Lee, Kwang Ho Song*, Hyun S. Park*, Jong Hyun Jang*, “Electrochemical impedance analysis of accelerated degradation of polymer electrolyte membrane fuel cells using a transmission line model”, Int. J. Hydrog. Energy, (43) 15457-15465 (2018).
Min Wook Chung, In Young Cha, Min Gwan Ha, Youngseung Na, Jungsoo Hwang, Hyung Chul Ham, Hyoung-Juhn Kim, Dirk Henkensmeier, Sung Jong Yoo, Jin Young Kim, So Young Lee, Hyun S. Park*, Jong Hyun Jang, “Enhanced CO2 reduction activity of polyethylene glycol-modified Au nanoparticles prepared via liquid medium sputtering”, Applied Catalysis B: Environmental, (237) 673-680 (2018).
Sung Ki Cho, Ramavi Akbar, Jinseok Kang, Won-Hee Lee, Hyun S. Park, “Electrodeposited Single-Crystalline PbCrO4 Microrods for Photoelectrochemical Water Oxidation: Enhancement of Minority Carrier Diffusion”, J. Mater. Chem. A, (6) 13312-13320 (2018).
Jin Kim, Jin Soo Kang, Juwon Jeong, Yoon Jun Son, Myeong Jae Lee, Jiho Kang, Ahyoun Lim, Hyun S. Park*, Yung-Eun Sung, “Electrochemically synthesized nanostructured iron carbide/carbon composite as a low-cost counter electrode for dye-sensitized solar cells”, J. Power Sources, (396) 213-219 (2018).
Angela Marinkas, Izabela Struzynska-Piron, Yona Lee, Ahyoun Lim, Hyun S. Park, Jong Hyun Jang, Hyoung-Juhn Kim, Jihyun Kim, Artjom Maljusch, Oliver Conradi, Dirk Henkensmeier, “Anion-conductive membranes based on 2-mesityl-benzimidazolium functionalized poly-(2,6-dimethyl-1,4-phenylene oxide) and their use in alkaline water electrolysis”, Polymer, (145) 242-251 (2018).
Byeongho Park, Heehong Yang, Taihwan Ha, Hyun S. Park, Seung Ja Oh, Yong-Sang Ryu, Juyeong Oh, Youngho Cho, Hyo-Suk Kim, Dong Kyu Lee, Chulki Kim, Taikjin Lee, Minah Seo, Jaebin Choi, Young Min Jhon, Deok Ha Woo, Seok Lee, Seok Hwan Kim, Hyuk-Jae Lee, Seong Chan Jun, Hyun Seok Song, Tai Hyun Park, Jae Hun Kim, “Artificial Rod and Cone Photoreceptors with Human-like Spectral Sensitivities”, Adv. Mater., 1706764 (2018).
Yoon Jun Son, Jin Soo Kang, Jungjin Yoon, Jin Kim, Juwon Jeong, Jiho Kang, Myeong Jae Lee, Mansoo Choi, Hyun S. Park*, Yung-Eun Sung, “Influence of TiO2 particle size on dye-sensitized solar cells employing organic sensitizer and cobalt (ii/iii) redox electrolyte”, J. Phys. Chem. C, (122) 7051-5060 (2018).
Min Kyung Cho, Hee-Young Park, Hye Jin Lee, Hyoung-Juhn Kim, Ahyoun Lim, Dirk Henkensmeier, Sugn Jong Yoo, Jin Young Kim, So Young Lee, Hyun S. Park*, Jong Hyun Jang, “Alkaline Anion Exchange Membrane Water Electrolysis: Effects of Electrolyte Feed Method and Electrode Binder Content”, J. Power Sources, (382) 22-29 (2018).
Seunghoe Choe, Byung-Seok Lee, Min Kyung Cho, Hyoung-Juhn Kim, Dirk Henkensmeier, Sung Jong Yoo, Jin Young Kim, So Young Lee, Hyun S. Park, Jong Hyun Jang, “Electrodeposited IrO2/Ti electrodes as durable and cost-effective anodes in high-temperature polymer-membrane-electrolyte water electrolyzers”, Applied Catalysis B: Environmental, (226) 289-294 (2018).
Jin Soo Kang, Jin Kim, Myeong Jae Lee, Yoon Jun Son, Dong Young Chung, Subin Park, Juwon Jeong, Ji Mun Yoo, Heeman Choi, Hyun S. Park*, Yung-Eun Sung*, “Electrochemical Synthesized nanoporous molybdenum carbide as a durable electrocatalyst for hydrogen evolution reaction”, Adv. Sci. (5) 1700601 (2018). –Inside Cover
Heung Chan Lee, Hyun S. Park, Sung Ki Cho, Kimin Nam, Allen J. Bard, “Direct photoelectrochemical characterization of photocatalytic H, N, doped TiO2 powder suspensions”, J. Electroanal. Chem., (819) 38-45 (2018).
Euiyoung Jung, Hee Young Park, Ahyoung Cho, Jong Hyun Jang, Hyun S. Park*, Taekyung Yu*, “Aqueous-synthesis of metal hydroxide nanoplates and platinum/nickel hydroxide hybrid nanostructures for enhancing the electrocatalytic properties”, Applied Catalysis B: Environmental, (225) 238-242 (2018).
Ahyoun Lim, Min Kyung Cho, So Young Lee, Hyoung-Juhn Kim, Sung Jong Yoo, Yung-Eun Sung, Jong Hyun Jang, Hyun S. Park*, “A Review on Industrially Developed Components and Operation Conditions for Anion Exchange Membrane Water Electrolysis”, J. Electrochem. Sci. Technol., (8) 265-273 (2017).
Youngjin Kim, Hanhyeong Choi, Hyun S. Park, Moon Sung Kang, Keun-Young Shin, Sang-Soo Lee, Jong Hyuk Park, “Reliable Multi-State Data Storage with Low-Power Consumption by Surface Oxidation of Pyramid-Structured Resistive Memory”, ACS Appl. Mater. Interfaces, (9) 38643-38650 (2017).
Haeri Kim, Hyun S. Park, Yun Jeong Hwang, Byoung Koun Min, “Surface morphology dependent electrolyte effects on gold-catalyzed electrochemical CO2 reduction”, J. Phys. Chem. C, (121) 22637-22643 (2017).
Jimin Kong, Ahyoun Lim, Changwon Yoon, Jong Hyun Jang, Hyung Chul Ham, Jong Hee Han, Sukwoo Nam, Yung-Eun Sung, Jungkyu Choi, Hyun S. Park*, “Electrochemical Synthesis of Ammonia in Anion Exchange Membrane Electrolyzer Using Iron Oxide Catalyst at Low Temperature and Atmospheric Pressure”, ACS Sustain. Chem. & Eng., (5) 10986-10995 (2017).-invited
Kyung Jin Lee, Dong Yun Shin, Ayeong Byeon, Ahyoun Lim, Young Suk Jo, Alina Begley, Dong-Hee Lim, Yung-Eun Sung, Hyun S. Park, Keun Hwa Chae, Suk Woo Nam, Kwan-Young Lee, Jin Young Kim, “Hierarchical cobanlt-nitride and –oxide co-doped porous carbon nanostructures for highly efficient and durable bifunational oxygen reaction electrocatalysts”, Nanoscale, (9) 15846-15855 (2017).
Hyunmi Doh, Hyo Young Kim, Ghun Sik Kim, Junyoung Cha, Hyun S. Park, Hyung Chul Ham, Sung Pil Yoon, Jonghee Han, Suk Woo Nam, Kwang Ho Song, Chang Won Yoon, “Influence of Cation Substitutions Based on ABO3 Perovskite Materials, Sr1-xYxTi1-yRuyO3-d on Ammonia Dehydrogenation”, ACS Sustain. Chem. Eng., (5) 9370-9379 (2017).
Min Kyung Cho, Ahyoun Lim, So Young Lee, Hyoung-Juhn Kim, Sung Jong Yoo, Yung-Eun Sung, Hyun S. Park*, Jong Hyun Jang, “A Review on Membrane Electrode Assembly Components and Evaluation Method for Alkaline Anion Exchange Membrane Water Electrolysis”, J. Electrochem. Sci. Technol., (8) 183-196 (2017).
Heung Chan Lee, Sung Ki Cho, Hyun S. Park, Kimin Nam, Allen J. Bard, “Visible light photoelectrochemical properties of PbCrO4, Pb2CrO5, and Pb5CrO8”, J. Phys. Chem. C, (121) 17561-17568 (2017).
Jin Soo Kang, Jin Kim, Myeong Jae Lee, Yoon Jun Son, Juwon Jeong, Dong Young Chung, Ahyoun Lim, Heeman Choi, Hyun S. Park*, Yung-Eun Sung*, “Electrochemical Synthesis of nanoporous tungsten carbide and its application as electrocatalysts for photoelectrochemical cells”, Nanoscale, (9) 5413-5424 (2017). –Front Cover
Min Kyung Cho, Hee-Young Park, Seunghoe Choe, Sung Jong Yoo, Jin Young Kim, Hyoung-Juhn Kim, Dirk Henkensmeier, So Young Lee, Yung-Eun Sung, Hyun S. Park*, Jong Hyun Jang, “Factors in Catalyst Layer Fabrication for Enhanced Performance in Anion Exchange Membrane Water Electrolysis”, J. Power Sources, (347) 283-290 (2017).
Min Jung Park, S. Joon Kwon, Hyun S. Park, Sung Jong Yoo, Jong Hyun Jang, Hyoung-Juhn Kim, Suk Woo Nam, Jin Young Kim, ”Urchin-Shaped Hollow Iron-Nitrogen-Doped Carbon Microspheres as High-Performance Electrocatalysts for Oxygen Reduction", J. Electrochem. Soc., (164) F224-F228 (2017).
Hyun S. Park*, Jong Hyun Jang, “Applications of scanning electrochemical microscopy (SECM) coupled with atomic force microscopy with a sub-micrometer spatial resolution to the development and discovery of electrocatalysts”, J. Electrochem. Sci. Technol., (7) 316-326 (2017).
Min Kyung Cho, Hee-Young Park, So Young Lee, Byung-Seok Lee, Hyoung-Juhn Kim, Dirk Henkensmeier, Sung Jong Yoo, Jin Young Kim, Jonghee Han, Hyun S. Park*, Yung-Eun Sung*, Jong Hyun Jang*, “Effect of Catalyst Layer Ionomer Content on Performance of Intermediaate Temperature Proton Exchange Membrane Fuel Cells (IT-PEMFCs) under Reduced Humidity Conditions”, Electrochim. Acta, (224) 228-234 (2017).
Jin Hee Lee, Jinwon Cho, Mina Jeon, Muhammad Ridwan, Hyun S. Park, Sun Hee Choi, Suk-woo Nam, Jonghee Han, Tae-Hoon Lim, Hyung Chul Ham, Chang Won Yoon, “Experimental and Computational Studies of Formic Acid Dehydrogenation over PdAu: Influence of Ensemble and Ligand Effects on Catalysis”, J. Mater. Chem. A, (4) 14141-14147 (2016).
Min Goo Kang, Chang-Whan Lee, Han Sae Dong, Seong-Cheol Jang, Shin Ae Song, Hyun S. Park, Sun Hee Choi, Hyung Chul Ham, Jonghee Han, Suk Woo Nam, Sung Hyun Kim, Sung Pil Yoon, “Effects of Vibrations in marine environments on performance of molten carbonate fuel cells”, Int. J. Hydrogen Energy, (41) 18732-18738 (2016).
Mina Jeon, Da Jung Han, Kug-Seung Lee, Sun Hee Choi, Jonghee Han, Suk Woo Nam, Seong Chul Jang, Hyun S. Park*, Chang Won Yoon*, “Electronically Modified Pd Catalysts Supported on N-doped Carbon for the Dehydrogenation of Formic Acid”, Int. J. Hydrogen Energy, (41) 15453-15461 (2016).
Semin Kim, Lindy K. Jang, Hyun S. Park, Jae Young Lee, “Electrochemical deposition of conductive and adhesive polypyrrole-dopamine films”, Scientific Reports, 6:30475 (2016).
Young-Hoon Chung, Kapil Gupta, Jue-Hyuk Jang, Hyun S. Park, Injoon Jang, Jong Hyun Jang, Yong-Kel, Lee, Seung-Cheol Lee, Sung Jong Yoo, “Rationalization of Electrocatalysis of Nickel Phosphide Nanowires for Efficient Hydrogen Production”, Nano Energy, (26) 496-503 (2016).
Min Goo Kang, Hyun S. Park*, Hyung Chul Ham, Seong-Cheol Jang, Chang Won Yoon, Jonghee Han, Suk Woo Nam, Sung Hyun Kim*, Sung Pil Yoon, “Effect of Cs2CO3 in Li/K and Li/Na Carbonate on the Oxygen Reduction Reaction for MCFC”, J. Electrochem. Soc., (163) F962-F967 (2016).
Chung-Yong Lee, Hyun S. Park, Juan C. Fontecilla-Camps, Erwin Reisner, “Photoelectrochemical H2 Evolution with a Hydrogenase Immobilized on a TiO2-protected Silicon Electrode”, Angew. Chem. Int. Ed., (55) 5971-5974 (2016).
(Book Chapter) Candace K. Chan, Harun Tüysüz, Artur Braun, Chinmoy Ranjan, Fabio La Mantia, Benjamin K. Miller, Liuxian Zhang, Peter A. Crozier, Joel A. Haber, John M. Gregoire, Hyun S. Park, Adam S. Batchellor, Lena Trotochaud, Shannon W. Boettcher, Advanced and In-situ Analytical Methods for Solar Fuel Materials, Top. Curr. Chem., (371) 253-324 (2015).
Yi-Hsuan Lai†, Hyun S. Park†, Jenny Zhang, Peter D. Matthews, Dominic S. Wright, Erwin Reisner, “A Si Photocathode Protected and Activated with a Catalytic Ti and Ni Composite Film for Solar Hydrogen Production in Water”, Chem. Eur. J., (21) 3919-3923 (2015). (†These authors contributed equally to this work.)
Hyun S. Park, Chong-Yong Lee, Erwin Reisner, “Photoelectrochemical Reduction of Aqueous Protons with a CuO|CuBi2O4 Heterojunction Under Visible Light Irradiation”, Phys. Chem. Chem. Phys., (16) 22462-22465 (2014).
Hyun S. Park, Hyung-Wook Ha, Rodney S. Ruoff, Allen J. Bard, “On the Improvement of Photoelectrochemical Performance and Finite Element Analysis of Reduced Graphene Oxide-BiVO4 Composite Electrodes”, J. Electroanal. Chem., (716) 8-15 (2014).
Sung Ki Cho, Hyun S. Park, Heung Chang Lee, Ki Min Nam, Allen J. Bard, “Metal Doping of BiVO4 by Composite Electrodeposition with Improved Photoelectrochemical Water Oxidation”, J. Phys. Chem. C, (117) 23048-23056 (2013).
(Book Chapter) Allen J. Bard, Heung Chan Lee, Kevin Leronard, Hyun S. Park, Shijun Wang, “Rapid Screening Methods in the Discovery and Investigation of New Photocatalyst Compositions,” in Photoelectrochemical Water Splitting: Materials, Processes and Architectures; H-J. Lewerenz and L. Peter, Eds.; Royal Society of Chemistry: Cambridge, UK, 2013; Chapter 6, 132-153.
Ki Min Nam, Hyun S. Park, Heung Chan Lee, Benjamin H. Meekins, Kevin C. Leonard, Allen J. Bard, “Compositional Screening of the Pb-Bi-Mo-O System. Spontaneous Formation of a Composite of p-PbMoO4 and n-Bi2O3 with Improved Photoelectrochemical Efficiency and Stability”, J. Phys. Chem. Lett., (4) 2707-2710 (2013).
Hyun S. Park, Heung Chan Lee, Kevin C. Leonard, Guanjie Liu, Allen J. Bard, “Unbiased Photoelectrochemical Water Splitting in Z-scheme Device Using W/Mo-BiVO4 and ZnxCd1-xSe”, ChemPhysChem, (14) 2277-2287 (2013).
Kevin C. Leonard, Ki Min Nam, Heung Chan Lee, Soon Hyung Kang, Hyun S. Park, Allen J. Bard, “ZnWO4/WO3 Composite for Improving Photoelectrochemical Water Oxidation”, J. Phys. Chem. C, (117) 15901-15910 (2013).
Hyun S. Park, Kevin C. Leonard, Allen J. Bard, “Surface Interrogation Scanning Electrochemical Microscopy (SI-SECM) of Photoelectrochemistry at a W/Mo-BiVO4 Semiconductor Electrode – Quantification of Hydroxyl Radicals During Water Oxidation”, J. Phys. Chem. C, (117) 12093-12102 (2013).
Jun Hui Park, Aliaksei Boika, Hyun S. Park, Heung Chan Lee, Allen J. Bard, “Single Collision Events of Conductive Nanoparticles Driven by Migration”, J. Phys. Chem. C, (117) 6651-6657 (2013).
Hoang X. Dang, Nathan T. Hahn, Hyun S. Park, Allen J. Bard, C. Buddie Mullins, “Nanostructured Ta3N5 Films as Visible-Light Active Photoanodes for Water Oxidation”, J. Phys. Chem. C, (116) 19225-19232 (2012).
Yanging Cong†, Hyun S. Park†, Shijun Wang, Hoang X. Dang, Fu-Ren F. Fan, C. Buddie mullins, Allen J. Bard, “Synthesis of Ta3N5 Nanotube Arrays Modified with Electrocatalysts for Photoelectrochemical Water Oxidation”, J. Phys. Chem. C, (116) 14541-14550 (2012). (†These authors contributed equally to this work.)
Yanqing Cong, Hyun S. Park, Hoang X. Dang, Fu-Ren F. Fan, Allen J. Bard, C. Buddie Mullins, “Tantalum Cobalt Nitride Photocatalysts for Water Oxidation under Visible Light”, Chem. Mater., 24 (3) 579-586 (2012).
Hyun S. Park, Kyoung Eun Kwon, Heechang Ye, Eunsu Paek, Gyeong S. Hwang, Allen J. Bard, “Factors in the Metal Doping of BiVO4 for Improved Photoelectrocatalytic Activity as Studied by Scanning Electrochemical Microscopy (SECM) and First-Principles Density-Functional Calculation”, J. Phys. Chem. C, (115) 17870-17879 (2011).
Heechang Ye, Hyun S. Park, Allen J. Bard, “Screening of Electrocatalysts for Photoelectrochemical Water Oxidation on W-Doped BiVO4 Photocatalysts by Scanning Electrochemical Microscopy”, J. Phys. Chem. C, (115) 12464-12470 (2011).
Heechang Ye, Hyun S. Park, Vahid A. Akhavan, Brian W. Goodfellow, Matthew G. Panthani, Brian A. Korgel, Allen J. Bard, “Photoelectrochemical characterization of CuInSe2 and Cu(In1-xGax)Se2 thin films for solar cells”, J. Phys. Chem. C, (115) 234-240 (2011).
Suk Ho Bhang, Nayoun Won, Tae-Jin Lee, Ho Jin, Jutaek Nam, Junhyuck Park, Hyokyun Chung, Hyun S. Park, Yung-Eun Sung, Sei Kwang Hahn, Byung-Soo Kim, Sungjee Kim, "Hyaluronic Acid - Quantum Dot Conjugates for In vivo Lymphatic Vessel Imaging", ACS Nano, 3(6), 1389-1398 (2009).
Y.-H. Cho, Hyun S. Park, J. Kim, Y.-Hw. Cho, S. W. Cha, Y.-E. Sung, “The operation characteristics of MEA with pinhole for polymer electrolyte membrane fuel cell”, Electrochem. Solid-State Lett., 11 (8) B153-B155 (2008).
Y.-H. Cho, Hyun S. Park, Y.-Hw. Cho, I.-S. Park, Y.-E. Sung, “The improved methanol tolerance using Pt/C in cathode of direct methanol fuel cell”, Electrochim. Acta, 53 (20) 5909-5912 (2008).
Y.-H. Cho, S. J. Yoo, Y.-Hw. Cho, Hyun S. Park, I.-S. Park, J. K. Lee, Y.-E. Sung, “Enhanced performance and improved interfacial properties of polymer electrolyte membrane fuel cells fabricated using sputter-deposited Pt thin-layers”, Electrochim. Acta, 53 (21) 6111-6116 (2008).
Hyun S. Park, Y.-H. Cho, Y.-Hw. Cho, I.-S. Park, N. Jung, M. Ahn, Y.-E. Sung, “Modified decal method and its related study of microporous layer in PEM fuel cells”, J. Electrochem. Soc., 155 (5) B455-B460 (2008).
S. J. Yoo, Y.-H. Cho, Hyun S. Park, J. K. Lee, Y.-E. Sung, “High utilization of Pt nanocatalysts fabricated using a high-pressure sputtering technique”, J. Power Sources, 178 (2) 547-553 (2008).
Hyun S. Park, Y.-H. Cho, Y.-Hw. Cho, C. R. Jung, J. H. Jang, Y.-E. Sung, “Performance enhancement of PEMFC through temperature control in catalyst layer fabrication", Electrochim. Acta, (53) 763–767 (2007).
Y.-H. Cho, Hyun S. Park, Y.-Hw. Cho, D.-S. Jung, H.-Y. Park, Y.-E. Sung, "Effect of platinum amount in carbon supported platinum catalyst on performance of polymer electrolyte membrane fuel cell", J. Power Sources, (172) 89–93 (2007).
1. Y.-H. Cho, B. Choi, Y.-Hw. Cho, Hyun S. Park, Y.-E. Sung, "Pd-based PdPt(19:1)/C electrocatalyst as an electrode in PEM fuel cell", Electrochem. Commun., (9) 378–381 (2007).