Hydrogen Oxidation Reaction Activity of Sub-Monolayer Pt-Shell/Pd-Core Nanoparticles

被引：2
作者：
Park, Hee-Young [1 ,2 ,3 ]
Jeon, Tae-Yeol [1 ,2 ]
Jang, Jong Hyun [3 ]
Yoo, Sung Jong [3 ]
Lee, Kug-Seung [1 ,2 ]
Cho, Yoon-Hwan [1 ,2 ]
Choi, Kwang-Hyun [1 ,2 ]
Cho, Yong-Hun [4 ]
Jung, Namgee [1 ,2 ]
Chung, Young-Hoon [1 ,2 ]
Sung, Yung-Eun [1 ,2 ]
机构：
[1] Seoul Natl Univ, IBS, Ctr Nanoparticle Res, Seoul 151744, South Korea
[2] Seoul Natl Univ, Sch Chem & Biol Engn, Seoul 151744, South Korea
[3] Korea Inst Sci & Technol, Fuel Cell Res Ctr, Seoul 136791, South Korea
[4] Kookmin Univ, Sch Adv Mat Engn, Seoul 136702, South Korea
来源：
JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2013年 / 160卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
PLATINUM-MONOLAYER ELECTROCATALYSTS; OXYGEN REDUCTION REACTION; BIMETALLIC CORE; O-2; REDUCTION; FUEL-CELL; PD ALLOY; ELECTROOXIDATION; CARBON; SURFACES; KINETICS;
D O I：
10.1149/2.058301jes
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
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.
引用
收藏
页码：H62 / H66
页数：5
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