Effect of oleylamine concentration on the structure and oxygen reduction activity of carbon-supported surface-Pt-enriched Pt3Au electrocatalysts

Title
Effect of oleylamine concentration on the structure and oxygen reduction activity of carbon-supported surface-Pt-enriched Pt3Au electrocatalysts
Authors
이국승박희영정영훈유성종남석우안도천성낙원장종현
Keywords
Pt3Au nanoparticle electrocatalyst; Surfactant concentration; Oxygen reduction reaction; Bulk CO oxidation; OH adsorption
Issue Date
2015-09
Publisher
Journal of power sources
Citation
VOL 290, 130-135
Abstract
For carbon-supported Pt-enriched Pt3Au nanoparticles (Pt3Au/C), the effect of oleylamine (OA) concentration during nanoparticle synthesis is investigated. When the OA concentration is increased from 0.12 mM to 1.2 mM, the particle size of Pt3Au gradually decreased from 5.1 nm to 3.3 nm, whereas the crystal structure and surface Pt concentration are not significantly influenced. With higher OA concentration, the oxygen reduction reaction activity of the Pt3Au/C is largely enhanced, which can be explained by the combined effect of increased specific activity and electrochemical surface area of Pt. It is experimentally confirmed using a bulk CO-oxidation technique that smaller particle size (larger OA concentration) leads to decreased OH adsorption strength, which originates from the double layer overlapping effect of closely adjacent nanoparticles.
URI
http://pubs.kist.re.kr/handle/201004/49706
ISSN
03787753
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KIST Publication > Article
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