Enhanced activity and stability of Pt catalysts on functionalized graphene sheets for electrocatalytic oxygen reduction

Rong Kou, Yuyan Shao, Donghai Wang, Mark H. Engelhard, Ja Hun Kwak, Jun Wang, Vilayanur V. Viswanathan, Chongmin Wang, Yuehe Lin, Yong Wang, Ilhan A. Aksay, Jun Liu

Research output: Contribution to journalArticlepeer-review

525 Scopus citations

Abstract

Electrocatalysis of oxygen reduction using Pt nanoparticles supported on functionalized graphene sheets (FGSs) was studied. FGSs were prepared by thermal expansion of graphite oxide. Pt nanoparticles with average diameter of 2 nm were uniformly loaded on FGSs by impregnation methods. Pt-FGS showed a higher electrochemical surface area and oxygen reduction activity with improved stability as compared with the commercial catalyst. Transmission electron microscopy, X-ray photoelectron spectroscopy, and electrochemical characterization suggest that the improved performance of Pt-FGS can be attributed to smaller particle size and less aggregation of Pt nanoparticles on the functionalized graphene sheets.

Original languageEnglish (US)
Pages (from-to)954-957
Number of pages4
JournalElectrochemistry Communications
Volume11
Issue number5
DOIs
StatePublished - May 2009

All Science Journal Classification (ASJC) codes

  • Electrochemistry

Keywords

  • Cathode durability
  • Fuel cell
  • Functionalized graphene sheets
  • Pt

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