Low loading platinum nanoparticles on reduced graphene oxide-supported tungsten carbide crystallites as a highly active electrocatalyst for methanol oxidation

Chun'an Ma*, Weiming Liu, Meiqin Shi, Xiaoling Lang, Youqun Chu, Zhaoyang Chen, Di Zhao, Wenfeng Lin, Christopher Hardacre

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

In this study, low loading platinum nanoparticles (Pt NPs) have been highly dispersed on reduced graphene oxide-supported WC nanocrystallites (Pt-WC/RGO) via program-controlled reduction-carburization technique and microwave-assisted method. The scanning electron microscopy and transmission electron microscopy results show that WC nanocrystallites are homogeneously decorated on RGO, and Pt NPs with a size of ca. 3 nm are dispersed on both RGO and WC. The prepared Pt-WC/RGO is used as an electrocatalyst for methanol oxidation reaction (MOR). Compared with the Pt/RGO, commercial carbon-supported Pt (Pt/C) and PtRu alloy (PtRu/C) electrocatalysts, the Pt-WC/RGO composites demonstrate higher electrochemical active surface area and excellent electrocatalytic activity toward the methanol oxidation, such as better tolerance toward CO, higher peak current density, lower onset potential and long-term stability, which could be attributed to the characterized RGO support, highly dispersed Pt NPs and WC nanocrystallites and the valid synergistic effect resulted from the increased interface between WC and Pt. The present work proves that Pt-WC/RGO composites could be a promising alternative catalyst for direct methanol fuel cells where WC plays the important role as a functional additive in preparing Pt-based catalysts because of its CO tolerance and lower price. 

Original languageEnglish
Pages (from-to)133-141
Number of pages9
JournalElectrochimica Acta
Volume114
DOIs
Publication statusPublished - 30 Dec 2013

Keywords

  • Tungsten carbide
  • Platinum
  • Reduced graphene oxide
  • Electrocatalyst
  • Methanol oxidation
  • FUEL-CELLS
  • CARBON NANOTUBES
  • ANODE CATALYSTS
  • PERFORMANCE
  • REDUCTION
  • ELECTROOXIDATION
  • COMPOSITE
  • SHEETS
  • FILMS
  • STABILITY

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

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