Choi, D. Jung, J.Y. Lee, M.J. Kim, S.-H. Lee, S. Lee, D.W. Kim, D.-G. Kim, N.D. Lee, K.-S. Kim, P. Yoo, S.J. 2024-01-19T13:03:02Z 2024-01-19T13:03:02Z 2022-01-10 2021-12-17 2155-5435 https://pubs.kist.re.kr/handle/201004/115931 In Pt-based alloy structures, selective leaching out of the non-Pt metal component (known as dealloying)improves catalytic activity during operation due to an increase in the electrochemically active surface area. This indicates that in Pt-based alloy structures, an electrochemical stimulus induces structural change, and the non-Pt component plays an important role in determining the catalytic performance. In this study, we prepared highly active and durable Pd@Cu@Pt core-shell catalysts for an acidic oxygen reduction reaction by a facile method and elucidated the correlation between performance improvement and repetitive potential cycling beyond a simple dealloying effect. Electrochemical activation induces the formation of a localized PtCu alloy, which is strongly correlated with excellent catalytic activity and durability (mass activity after durability test: 2.6 A mg-1Pt), on the surface and subsurface via atomic rearrangement. The origin of such catalytic activity and durability is determined by synchrotron X-ray spectroscopy, electrochemical analysis, and density functional theory calculations. ？ English American Chemical Society Atomic Rearrangement in Core-Shell Catalysts Induced by Electrochemical Activation for Favorable Oxygen Reduction in Acid Electrolytes Article 10.1021/acscatal.1c03879 1 ACS Catalysis, v.11, no.24, pp.15098 - 15109 ACS Catalysis 11 24 15098 15109 scie scopus 000751835200041 2-s2.0-85120897804 Chemistry, Physical Chemistry Article PLATINUM-MONOLAYER ELECTROCATALYSTS NANOPARTICLES STABILITY EFFICIENT STRAIN ALLOYS PD/C atomic rearrangement electrochemical activation green synthesis localized alloy formation oxygen reduction reaction