Characterization of carbon-supported AuPt nanoparticles for electrocatalytic methanol oxidation reaction

Jin Luo, Peter N. Njoki, Yan Lin, Derrick Mott, Lingyan Wang, Chuan Jian Zhong

Research output: Contribution to journalArticlepeer-review

258 Citations (Scopus)

Abstract

In view of the recent finding that the bimetallic AuPt nanoparticles prepared by molecular-capping-based colloidal synthesis and subsequent assembly on carbon black support and thermal activation treatment exhibit alloy properties, which is in sharp contrast to the bimetallic miscibility gap known for the bulk counterparts in a wide composition range, there is a clear need to assess the electrocatalytic properties of the catalysts prepared with different bimetallic composition and different thermal treatment temperatures. This paper reports recent results of such an investigation of the electrocatalytic methanol oxidation reaction (MOR) activities of the carbon-supported AuPt nanoparticle catalysts with different bimetallic composition and thermal treatment temperatures. Au mPt 100-m nanoparticles of 2-3 nm core sizes with different atomic compositions ranging from 10% to 90% Au (m = 10∼90) have been synthesized by controlling the feeding of the metal precursors used in the synthesis. The electrocatalytic MOR activities of the carbon-supported AuPt bimetallic catalysts were characterized in alkaline electrolytes. The catalysts with 65% to 85% Au and treated at 500 °C were found to exhibit maximum electrocatalytic activities in the alkaline electrolytes. The findings, together with a comparison with some well-documented catalysts as well as recent experimental and theoretical modeling results, have revealed important insights into the participation of CO ad and OH ad on Au sites in the catalytic reaction of Pt in the AuPt alloys with ∼75% Au. The insights are useful for understanding the correlation of the bifunctional electrocatalytic activity of the bimetallic nanoparticle catalysts with the bimetallic composition and the thermal treatment temperatures.

Original languageEnglish
Pages (from-to)2892-2898
Number of pages7
JournalLangmuir
Volume22
Issue number6
DOIs
Publication statusPublished - 2006 Mar 14
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Fingerprint Dive into the research topics of 'Characterization of carbon-supported AuPt nanoparticles for electrocatalytic methanol oxidation reaction'. Together they form a unique fingerprint.

Cite this