Jeong, Hui-Yun Kim, Dong-Gun Akpe, Shedrack G. Paidi, Vinod K. Park, Hyun S. Lee, Soo-Hyoung Lee, Kug-Seung Ham, Hyung Chul Kim, Pil Yoo, Sung Jong 2024-01-19T14:31:41Z 2024-01-19T14:31:41Z 2021-10-21 2021-06-02 1944-8244 https://pubs.kist.re.kr/handle/201004/116872 A simple wet-chemical route for the preparation of core-shell-structured catalysts was developed to achieve high oxygen reduction reaction (ORR) activity with a low Pt loading amount. Nickel nitride (Ni3N) nanoparticles were used as earth-abundant metal-based cores to support thin Pt layers. To realize the site-selective formation of Pt layers on the Ni3N core, hydrogen molecules (H-2) were used as a mild reducing agent. As H-2 oxidation is catalyzed by the surface of Ni3N, the redox reaction between H-2 and Pt(IV) in solution was facilitated on the Ni3N surface, which resulted in the selective deposition of Pt on Ni3N. The controlled Pt formation led to a subnanometer (0.5-1 nm)thick Pt shell on the Ni3N core. By adopting the core-shell structure, higher ORR activity than the commercial Pt/C was achieved. Electrochemical measurements showed that the thin Pt layer on Ni3N nanoparticle exhibits 5 times higher mass activity and specific activity than that of commercial Pt/C. Furthermore, it is expected that the proposed simple wet-chemical method can be utilized to prepare various transition-metal-based core-shell nanocatalysts for a wide range of energy conversion reactions. English American Chemical Society X-RAY-ABSORPTION CORE-SHELL CATALYST SURFACE SEGREGATION RECENT ADVANCEMENTS HIGH-PERFORMANCE IN-SITU PLATINUM ELECTROCATALYSTS ALLOY STABILITY Hydrogen-Mediated Thin Pt Layer Formation on Ni3N Nanoparticles for the Oxygen Reduction Reaction Article 10.1021/acsami.1c01544 1 ACS Applied Materials & Interfaces, v.13, no.21, pp.24624 - 24633 ACS Applied Materials & Interfaces 13 21 24624 24633 scie scopus 000659315800025 2-s2.0-85107711027 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article X-RAY-ABSORPTION CORE-SHELL CATALYST SURFACE SEGREGATION RECENT ADVANCEMENTS HIGH-PERFORMANCE IN-SITU PLATINUM ELECTROCATALYSTS ALLOY STABILITY fuel cell oxygen reduction reaction electrocatalyst core-shell structure platinum