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Electrochimica ActaVolume 54, Issue 4, 30 January 2009, Pages 1375-1382

Effect of chemisorbed carbon monoxide on Pt/C electrode on the mechanism of the hydrogen oxidation reaction(Article)

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  • aInstitute for Multidisciplinary Research, Belgrade, Serbia
  • bInstitute of Technical Sciences-SASA, Belgrade, Serbia
  • cNational Center for Electron Microscopy, LBLN University of California, Berkeley, United States
  • dFaculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia

Abstract

The influence of poisoning of Pt catalyst by CO on the kinetics and mechanism of H2 oxidation reaction (HOR) at Pt/C electrode in 0.5 mol dm-3 HClO4, saturated with H2 containing 100 ppm CO, was examined with rotating disc electrode (RDE) at 22 °C. Commercial carbon black, Vulcan XC-72 was used as support, while Pt/C catalyst was prepared by modified polyol synthesis method in an ethylene glycol (EG) solution. The kinetically controlled current (Ik) for the HOR at Pt/C decreases significantly at CO coverage (ΘCO) > 0.6. For ΘCO < 0.6 the HOR takes place through Tafel-Volmer mechanism with Tafel reaction as rate-determining step at the low CO coverage, while Volmer step controls the overall reaction rate at the medium CO coverage. When CO coverage is higher then 0.6, Heyrovsky-Volmer mechanism is operative for the HOR with Heyrovsky as the rate-determining step (rds). © 2008 Elsevier Ltd. All rights reserved.

Author keywords

CO adsorptionHydrogen oxidationMechanismPt nanosized catalystRDE

Indexed keywords

Engineering controlled terms:AdsorptionCarbon blackCatalysisCatalyst poisoningChemisorptionElectrolysisEthyleneEthylene glycolGas adsorptionGlycolsHydrogenOxidationPlatinumPlatinum alloysReaction kineticsReaction rates
Engineering uncontrolled terms:CO adsorptionCO coveragesHeyrovskyHydrogen oxidationHydrogen oxidation reactionsKinetics and mechanismsOverall reactionsOxidation reactionsPolyol synthesesPt catalystsPt nanosized catalystRDERotating disc electrodesStep controls
Engineering main heading:Carbon monoxide

Funding details

Funding sponsor Funding number Acronym
Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja142038MPNTR
Ministarstvo Prosvete, Nauke i Tehnološkog RazvojaMPNTR

  • 1

    This paper has been supported by the Ministry of Science, Republic of Serbia, under Contract No. 142038.

  • ISSN: 00134686
  • CODEN: ELCAA
  • Source Type: Journal
  • Original language: English
  • DOI: 10.1016/j.electacta.2008.08.067
  • Document Type: Article

  Krstajić, N.V.; Faculty of Technology and Metallurgy, University of Belgrade, Serbia;
© Copyright 2009 Elsevier B.V., All rights reserved.

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