Kang, Yun Sik Yoo, Sung Jong Lee, Myeong Jae Kim, Mi-Ju Lee, Stanfield Youngwon Lee, Kug-Seung Sung, Yung-Eun 2024-01-20T02:33:20Z 2024-01-20T02:33:20Z 2021-09-04 2016-12-28 0360-3199 https://pubs.kist.re.kr/handle/201004/123299 We have synthesized carbon-supported Pt and PtM (Au, Pd) nanoparticles (NPs) by using an aluminum (Al) metal foil as a reducing agent and conducted post heat treatments to investigate the relationship between oxygen reduction reaction (ORR) activity and surface crystalline/electronic structures of electrocatalysts. The as-prepared Pt and PtM (Au, Pd) NPs received the post heat treatment to induce structural modifications to improve ORR activity. From structural characterizations, well-synthesized carbon-supported Pt and PtM (Au, Pd) NPs were confirmed and the post heat treatment has the effect of inducing the alteration of surface crystalline structure and results in higher ORR activity. Furthermore, based on electrochemical characterizations, it is proved that after the heat treatment, the surface reconstruction brought about the increased fraction of Pt (111) and electrochemical active surface area of PtAu/C CO sample. And, the downshift of Pt d-band center of PtPd/C CO sample, which decreases the affinity of Pt to oxygen species, occurred resulting in more favorable kinetics of ORR. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD GALVANIC DISPLACEMENT SURFACE SEGREGATION CATALYTIC-ACTIVITY METHANOL OXIDATION PT-SKIN SHELL ENHANCEMENT DEPOSITION STABILITY POLYCRYSTALLINE Facile synthesis of platinum alloy electrocatalyst via aluminum reducing agent and the effect of post heat treatment for oxygen reduction reaction Article 10.1016/j.ijhydene.2016.09.147 1 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.41, no.48, pp.22952 - 22962 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 41 48 22952 22962 scie scopus 000391077400036 2-s2.0-84990852967 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article GALVANIC DISPLACEMENT SURFACE SEGREGATION CATALYTIC-ACTIVITY METHANOL OXIDATION PT-SKIN SHELL ENHANCEMENT DEPOSITION STABILITY POLYCRYSTALLINE Oxygen reduction reaction Pt alloy nanoparticle Aluminum reducing agent Surface structure Pt d-band center