Park, Hee-Young Jeon, Tae-Yeol Jang, Jong Hyun Yoo, Sung Jong Lee, Kug-Seung Cho, Yoon-Hwan Choi, Kwang-Hyun Cho, Yong-Hun Jung, Namgee Chung, Young-Hoon Sung, Yung-Eun 2024-01-20T13:04:58Z 2024-01-20T13:04:58Z 2021-09-01 2013-01 0013-4651 https://pubs.kist.re.kr/handle/201004/128521 The hydrogen oxidation reaction activity of sub-monolayer Pt-shell/Pd-core nanoparticles was investigated at a Pt surface concentration of 0 similar to 5.7%. The nanoparticles were prepared using a colloidal approach. The combination of electrochemical measurements and high resolution-X-ray photoelectron spectroscopy revealed a significant decrease in oxidized Pd atoms (23.4%) with a Pt surface concentration of 1.7% compared with that of Pd/C. X-ray absorption spectroscopy of the Pt LIII edge suggested preferred Pt deposition, which led to more oxidized Pt atoms during Pt shell growth. The exchange current density of the hydrogen oxidation reaction on the electrocatalyst with a Pt surface concentration of 4.9% was 3.5 times higher than that on Pd/C and was comparable with that on Pt surfaces. The changes in hydrogen oxidation reaction apparent enthalpy due to Pt shell growth suggested a rate determining step (RDS) change (Volmer reaction -> Tafel reaction) at a Pt surface concentration of 1.7%. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.058301jes] All rights reserved. English ELECTROCHEMICAL SOC INC PLATINUM-MONOLAYER ELECTROCATALYSTS OXYGEN REDUCTION REACTION BIMETALLIC CORE O-2 REDUCTION FUEL-CELL PD ALLOY ELECTROOXIDATION CARBON SURFACES KINETICS Hydrogen Oxidation Reaction Activity of Sub-Monolayer Pt-Shell/Pd-Core Nanoparticles Article 10.1149/2.058301jes 1 JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.160, no.1, pp.H62 - H66 JOURNAL OF THE ELECTROCHEMICAL SOCIETY 160 1 H62 H66 scie scopus 000313578400071 2-s2.0-84875954832 Electrochemistry Materials Science, Coatings & Films Electrochemistry Materials Science Article PLATINUM-MONOLAYER ELECTROCATALYSTS OXYGEN REDUCTION REACTION BIMETALLIC CORE O-2 REDUCTION FUEL-CELL PD ALLOY ELECTROOXIDATION CARBON SURFACES KINETICS 연료전지 PtPd 합금촉매 수소환원반응