Lee, Byung-Seok Park, Hee-Young Cho, Min Kyung Jung, Jea Woo Kim, Hyoung-Juhn Henkensmeier, Dirk Yoo, Sung Jong Kim, Jin Young Park, Sehkyu Lee, Kwan-Young Jang, Jong Hyun 2024-01-20T05:00:31Z 2024-01-20T05:00:31Z 2021-09-04 2016-03 1388-2481 https://pubs.kist.re.kr/handle/201004/124356 The oxygen electrodes in unitized regenerative fuel cells (URFC) must have high activities towards oxygen reduction reaction (ORR) as well as oxygen evolution reaction (OER), thus requiring high loading of noble metal electrocatalysts. In this study, porous Pt/IrO2/carbon paper (CP) electrocatalysts were developed to reduce the metal loading. The Pt/IrO2/CP electrodes were fabricated by sequential formation of IrO2 layers (loading 0.1 mg cm(-2)) and porous Pt layers (0-0.3 mg cm(-2)) on CP substrates by electrodeposition and spraying techniques, respectively. The fuel cell (FC) performances increased linearly up to 0.69 A cm(-2)with increasing Pt loading (up to similar to 0.3 mg cm(-2)) at 0.6 V, whereas the water electrolysis (WE) activity was highest at Pt loading of 0.2 mg cm(-2). The current densities in the FC and WE modes and round-trip efficiency of the developed Pt/IrO2/CP electrodes with the oxygen electrocatalysts loadings of 0.3 and 0.4 mg cm(-2) were higher or comparable to previously reported values with higher loading (1.5-4.0 mg cm(-2)). These high performances with low loading are probably due to the facile oxygen and water transport through well-developed macropores originating from the open CP structures, providing effective utilization of the IrO2 and Pt electrocatalysts towards OER and ORR, respectively. (C) 2016 Elsevier B.V. All rights reserved. English Elsevier BV Development of porous Pt/IrO2/carbon paper electrocatalysts with enhanced mass transport as oxygen electrodes in unitized regenerative fuel cells Article 10.1016/j.elecom.2016.01.002 1 Electrochemistry Communications, v.64, pp.14 - 17 Electrochemistry Communications 64 14 17 N scie scopus 000371913500005 2-s2.0-84955454237 Electrochemistry Electrochemistry Article IRIDIUM OXIDE MEMBRANE PERFORMANCE CATALYST Unitized regenerative fuel cell Oxygen electrode Platinum Iridium oxide