Effect of oleylamine concentration on the structure and oxygen reduction activity of carbon-supported surface-Pt-enriched Pt<inf>3</inf>Au electrocatalysts

Kug Seung Lee, Hee Young Park, Young Hoon Chung, Sung Jong Yoo, SukWoo Nam, Docheon Ahn, Nark Eon Sung, Jong Hyun Jang

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

For carbon-supported Pt-enriched Pt<inf>3</inf>Au nanoparticles (Pt<inf>3</inf>Au/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 Pt<inf>3</inf>Au 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 Pt<inf>3</inf>Au/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.

Original languageEnglish
Pages (from-to)130-135
Number of pages6
JournalJournal of Power Sources
Volume290
DOIs
Publication statusPublished - 2015 May 10

Keywords

  • Bulk CO oxidation
  • OH adsorption
  • Oxygen reduction reaction
  • Pt<inf>3</inf>Au nanoparticle electrocatalyst
  • Surfactant concentration

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

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