Effect of SnO2 deposition sequence in SnO2 -modified PtRu/C catalyst preparation on catalytic activity for methanol electro-oxidation

Guoxiong Wang, Tatsuya Takeguchi, Yi Zhang, Ernee Noryana Muhamad, Masahiro Sadakane, Shen Ye, Wataru Ueda

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19 Citations (Scopus)


SnO2 -modified PtRu/C catalysts were prepared in a polyol process to investigate the effect of a SnO2 deposition sequence on the catalytic activity for methanol electro-oxidation. The structure, morphology, and chemical state of the prepared catalysts were characterized by X-ray diffraction, scanning transmission electron microscopy, and X-ray photoelectron spectroscopy. The electrochemical activities were evaluated by cyclic voltammetry, linear sweep voltammetry, and chronoamperometry measurements in combination with in situ IR reflection-absorption spectroscopy (IRRAS). Compared with those in the PtRu/C catalyst, a simultaneous deposition of PtRu and SnO2 particles or a deposition of SnO2 prior to PtRu improved the metal dispersion and decreased the alloyed Ru fraction. The deposition sequence of SnO2 did not alter the chemical-state distribution of Pt and Ru but resulted in a different surface atomic ratio of Pt, Ru, and SnO2. Electrochemical and in situ IRRAS measurements indicated that the SnO2 -modified PtRu/C catalyst prepared by the deposition of PtRu prior to SnO2 gave the best catalytic activity for COads and methanol electro-oxidation among the PtRu/C and SnO2 -modified PtRu/C catalysts. The roles of SnO2 deposited with different sequences in the SnO2 -modified PtRu/C catalysts were proposed.

Original languageEnglish
Pages (from-to)B862-B869
JournalJournal of the Electrochemical Society
Issue number7
Publication statusPublished - 2009 Jun 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry


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