Kabiraz, Mrinal Kanti Ruqia, Bibi Kim, Jeonghyeon Kim, Haesol Kim, Hee Jin Hong, Youngmin Kim, Mi Ji Kim, Young Kyoung Kim, Chan Lee, Won-Jae Lee, Wonkyun Hwang, Gyo Hyun Ri, Hyeong Cheol Baik, Hionsuck Oh, Hyung-Suk Lee, Young Wook Gao, Lei Huang, Hongwen Paek, Seung Min Jo, Youn-Jung Choi, Chang Hyuck Han, Sang Woo Choi, Sang-Il 2024-01-19T12:31:30Z 2024-01-19T12:31:30Z 2022-05-04 2022-03 2155-5435 https://pubs.kist.re.kr/handle/201004/115530 Grain boundaries (GBs) are defects in crystal structures, which are in general known to be highly active toward various electrocatalytic reactions. Herein, we identify the adverse behaviors of the GBs for bimetallic platinum-cobalt (Pt-Co) nanocatalysts in the oxygen reduction reaction (ORR). As model catalysts, GB-rich Pt-Co nanowires (Pt-Co GB-NWs) and single-crystalline Pt-Co nanowires (Pt-Co SC-NWs) are synthesized. They have very similar diameters, Pt-to-Co ratios, and Pt-rich surface structures, except for the GB populations, which can be precisely controlled by applying an external magnetic field during their synthesis. The presence of GBs in Pt-Co NWs promotes Co leaching at an applied electrochemical potential, inducing significant changes in the surface Pt-to-Co ratio. The resulting Pt-Co GB-NWs perform only half the ORR activity compared with the Pt-Co SC-NWs. As a result, it is revealed that the surface GB sites are deactivated by causing elemental leaching and may not act as an ORR promoter for the Pt-Co nanowire catalyst. English American Chemical Society Understanding the Grain Boundary Behavior of Bimetallic Platinum-Cobalt Alloy Nanowires toward Oxygen Electro-Reduction Article 10.1021/acscatal.1c05766 1 ACS Catalysis, v.12, no.6, pp.3516 - 3523 ACS Catalysis 12 6 3516 3523 N scie scopus 000778789200022 Chemistry, Physical Chemistry Article ELECTROCATALYSTS CATALYSTS EVOLUTION GROWTH platinum cobalt nanowire grain boundary oxygen reduction reaction