Nanostructure PtRu/MWNTs as anode catalysts prepared in a vacuum for direct methanol oxidation

Yan Juan Gu, Wing Tak Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

147 Citations (Scopus)

Abstract

Platinum and ruthenium nanoparticles that are uniformly dispersed on multiwalled carbon nanotubes (MWNTs) were synthesized by vacuum pyrolysis using Pt(acac)2and Ru(acac)3as the metal precursors. The resulting nanocomposites were characterized by transmission electron microscopy and X-ray diffraction. The Pt, Pt45Ru55, and Ru nanoparticles had mean diameters of 3.0 ± 0.6, 2.7 ± 0.6, and 2.5 ± 0.4 nm and the same mole number as their metal precursors at 500°C. The electrocatalytic activity of the Pt/MWNTs and PtRu/MWNTs was investigated at room temperature by cyclic voltammetry and chronoamperometry. All of the electrochemical results showed that the PtRu/MWNTs exhibited a high level of catalytic activity for methanol oxidation as a result of the large surface area of the supporting carbon nanotubes and the wide dispersion of the Pt and Ru nanoparticles. Compared with the Pt/MWNTs, the onset potential for methanol oxidation of the PtRu/MWNTs was significantly lower, and the ratio of the forward anodic peak current to the reverse anodic peak current during methanol oxidation was somewhat higher. The Pt45Ru55/MWNTs displayed the best electrocatalytic activity of all of the carbon-nanotube- supported Pt and PtRu catalysts.
Original languageEnglish
Pages (from-to)11447-11452
Number of pages6
JournalLangmuir
Volume22
Issue number26
DOIs
Publication statusPublished - 19 Dec 2006
Externally publishedYes

ASJC Scopus subject areas

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

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