Choi, Juhyuk Cho, Jinwon Roh, Chi-Woo Kim, Beom-Sik Choi, Min Suk Jeong, Hojin Ham, Hyung Chul Lee, Hyunjoo 2024-01-19T20:00:36Z 2024-01-19T20:00:36Z 2021-09-02 2019-06-15 0926-3373 https://pubs.kist.re.kr/handle/201004/119883 Proton exchange membrane fuel cells (PEMFCs) are promising mobile power supply systems, and operate without noise or polluting emissions. Because the oxygen reduction reaction (ORR) at the cathode suffers from high overpotential and sluggish kinetics, many catalysts have been developed in efforts to enhance activity and durability for the ORR. However, most of them have complicated synthetic procedures which cannot be scaled up easily, and have only been tested in a half-cell. High activity in a half-cell does not necessarily guarantee better performance in a single-cell. In this work, we synthesized an Au-doped PtCo/C catalyst using a simple method of gas-phase reduction and subsequent galvanic replacement, and its activity and durability were tested in a single-cell. When current densities were compared at 0.6 V after a durability test of 30,000 cycles in 0.6-1.0 V, the values were 1.40, 0.81, and 0.63 A cm(-2) for the Au-doped PtCo/C, acid-treated PtCo/C, and commercial Pt/C catalysts, respectively. Co leaching was much less in the Au-doped PtCo/C. Density functional theory (DFT) calculations confirmed that surface oxygen species bound more weakly at the catalyst surface and migration of a Co atom (Co segregation) to the surface was suppressed in the presence of Au. This facile method can provide a more realistic strategy to design better ORR catalysts for PEMFC application. English ELSEVIER OXYGEN REDUCTION REACTION ENHANCED ACTIVITY MONOLAYER ELECTROCATALYSTS NANOPARTICLE CATALYSTS SURFACE SEGREGATION ALLOY CATALYSTS O-2 REDUCTION PT-NI STABILITY NANOSTRUCTURES Au-doped PtCo/C catalyst preventing Co leaching for proton exchange membrane fuel cells Article 10.1016/j.apcatb.2019.02.002 1 APPLIED CATALYSIS B-ENVIRONMENTAL, v.247, pp.142 - 149 APPLIED CATALYSIS B-ENVIRONMENTAL 247 142 149 scie scopus 000460715100014 2-s2.0-85061155372 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article OXYGEN REDUCTION REACTION ENHANCED ACTIVITY MONOLAYER ELECTROCATALYSTS NANOPARTICLE CATALYSTS SURFACE SEGREGATION ALLOY CATALYSTS O-2 REDUCTION PT-NI STABILITY NANOSTRUCTURES PEMFC Leaching Durability Cobalt Gold