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Journal of the Serbian Chemical SocietyVolume 78, Issue 11, 2013, Pages 1703-1716

Electrochemical oxidation of methanol on Pt/(RuxSn 1-x)O2 nanocatalyst(Article)(Open Access)

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  • aFaculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia
  • bInstitute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia
  • cVinča Institute of Nuclear Sciences, University of Belgrade, P. O. Box 522, 11001 Belgrade, Serbia
  • dInstitute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11030 Belgrade, Serbia

Abstract

Ru-doped SnO2 powder, (RuxSn1-x)O 2, with a Sn:Ru atomic ratio of 9:1 was synthesized and used as a support for Pt nanoparticles (30 mass % loading). The (RuxSn 1-x)O2 support and the Pt/(RuxSn 1-x)O2 catalyst were characterized by X-ray diffraction measurements, energy dispersive X-ray spectroscopy and transmission electron microscopy (TEM). The (RuxSn1-x)O2 was found to be a two-phase material consisting of probably a solid solution of RuO 2 in SnO2 and pure RuO2. The average Pt particle size determined by TEM was 5.3 nm. Cyclic voltammetry of Pt/(Ru xSn1-x)O2 indicated good conductivity of the support and displayed the usual features of Pt. The results of the electrochemical oxidation of COads and methanol on Pt/(Ru xSn1-x)O2 were compared with those on commercial Pt/C and PtRu/C catalysts. Oxidation of COads on Pt/(RuxSn1-x)O2 starts at lower positive potentials than on PtRu/C and Pt/C. Potentiodynamic polarization curves and chronoamperometric curves of methanol oxidation indicated higher initial activity of the Pt/(RuxSn1-x)O2 catalyst compared to PtRu/C, but also a greater loss in current density over time. A potentiodynamic stability test of the catalysts revealed that deactivation of Pt/(RuxSn1-x)O2 and Pt/C was primarily caused by poisoning of the Pt surface by residues of methanol oxidation, which mostly occurred during the first potential cycle. In the case of PtRu/C, the poisoning of the surface was minor and deactivation was caused by surface area loss of the PtRu. ©2013 SCS.

Author keywords

CO oxidationElectrocatalysisFuel cellMethanol oxidationPlatinum
  • ISSN: 03525139
  • CODEN: JSCSE
  • Source Type: Journal
  • Original language: English
  • DOI: 10.2298/JSC130718091K
  • Document Type: Article
  • Publisher: Serbian Chemical Society

  Gojković, S.Lj.; Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Serbia;
© Copyright 2021 Elsevier B.V., All rights reserved.

Cited by 2 documents

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(2024) Industrial and Engineering Chemistry Research
Hang, H. , Altarawneh, R.M. , Brueckner, T.M.
Pt/Ru-Sn Oxide/Carbon Catalysts for Ethanol Oxidation
(2020) Journal of the Electrochemical Society
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