Enhanced activity of Pt-based electrocatalysts for oxygen reduction via a selective Pt deposition process

Tae Yeol Jeon, Nicola Pinna, Sung Jong Yoo, Seung-Ho Yu, Sang Kyung Kim, Seongyop Lim, Donghyun Peck, Doo Hwan Jung, Yung Eun Sung

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Carbon-supported Pt nanoparticles with various loading of Pt are prepared by a novel seed-mediated growth method using hydroquinone (HQ) assisted selective deposition. The structural and morphological dependence of the Pt nanoparticles on the catalytic activity in oxygen reduction reaction (ORR) is investigated. The analysis of core-level X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) cannot elucidate the origin of the large enhancement of the ORR activity. In contrast, electrochemical measurements of the CO-displacement charge and the concomitant CO adlayer oxidation behavior prove that the selective deposition of additional Pt contributed to the decrease of surface defects and to the increase of the onset potential for OH adsorption.

Original languageEnglish
Pages (from-to)70-79
Number of pages10
JournalJournal of Electroanalytical Chemistry
Volume662
Issue number1
DOIs
Publication statusPublished - 2011 Nov 1
Externally publishedYes

Keywords

  • Electrocatalyst
  • Oxygen reduction reaction
  • Pt nanoparticle
  • Surface defect

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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