Lim, Ahyoun Lee, Ju Sung Lee, Suji Lee, So Young Kim, Hyoung-juhn Yoo, Sung Jong Jang, Jong Hyun Sung, Yung-Eun Park, Hyun S. 2024-01-19T13:30:42Z 2024-01-19T13:30:42Z 2021-10-21 2021-11-15 0926-3373 https://pubs.kist.re.kr/handle/201004/116130 Unitized regenerative fuel cells (URFCs) are electrochemical devices operating as both fuel cells (FCs) or water electrolysis (WE). For practical efficiency in both FC and WE operations, a substantial amount of platinum and iridium, up to 3 mg cm(-2), is often employed in URFCs. The main obstacle in catalysis of the URFC is oxygen reduction or water oxidation reactions for FC or WE operation, respectively. The electrode also requires different affinities for water, that is, hydrophobicity and hydrophilicity for gas and water transport, respectively. In this study, the water flux of the anode and cathode electrodes is systematically controlled by manipulating the relative humidity of the supplied gas and altering the selection of the electrode in amphiphilic membrane electrode assembly. By investigating the operation factors of URFC, 51 % of high round trip efficiency (@ 0.4 A cm(-2)) was achieved with only 0.65 mg((Pt+Ir)) cm(-2) of the noble catalyst. English ELSEVIER GAS-DIFFUSION LAYER OXYGEN-ELECTRODE WATER-ELECTROLYSIS MASS-TRANSPORT SUPPORTED IRO2 ELECTROCATALYSTS ANODE PERFORMANCE STABILITY TECHNOLOGIES Polymer electrolyte membrane unitized regenerative fuel cells: Operational considerations for achieving high round trip efficiency at low catalyst loading Article 10.1016/j.apcatb.2021.120458 1 APPLIED CATALYSIS B-ENVIRONMENTAL, v.297 APPLIED CATALYSIS B-ENVIRONMENTAL 297 scie scopus 000700112900003 2-s2.0-85109403551 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article GAS-DIFFUSION LAYER OXYGEN-ELECTRODE WATER-ELECTROLYSIS MASS-TRANSPORT SUPPORTED IRO2 ELECTROCATALYSTS ANODE PERFORMANCE STABILITY TECHNOLOGIES Unitized regenerative fuel cell Electrodeposition Relative humidity Catalysts Operation mode for unitized regenerative fuel cell