Hydrogen oxidation reaction activity of sub-monolayer Pt-shell/Pd-core nanoparticles

Title
Hydrogen oxidation reaction activity of sub-monolayer Pt-shell/Pd-core nanoparticles
Authors
박희영전태열장종현유성종이국승조윤환최광현조용훈정남기정영훈성영은
Keywords
연료전지; PtPd 합금촉매; 수소환원반응
Issue Date
2013-01
Publisher
Journal of the Electrochemical Society
Citation
VOL 160, NO 1, H62-H66
Abstract
The hydrogen oxidation reaction activity of sub-monolayer Pt-shell/Pd-core nanoparticles was investigated at a Pt surface concentration of 0 ~ 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%.
URI
http://pubs.kist.re.kr/handle/201004/44090
ISSN
00134651
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KIST Publication > Article
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