Shape-dependent electrocatalysis: CO monolayer oxidation at platinum nanoparticles

J. Solla-Gullón*, F. J. Vidal-Iglesias, P. Rodríguez, E. Herrero, J. M. Feliu, A. Aldaz, Paramaconi Rodriguez

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

CO monolayer oxidation at Pt nanoparticles with different shape has been studied. A clear relationship between CO oxidation and surface structure/shape of the nanoparticles can be demonstrated. Whereas quasi-spherical small Pt nanoparticles show only a single, broad main oxidation peak, the employ of preferentially oriented Pt(100) nanoparticles originates peak multiplicity in the CO oxidation process. As a consequence of the increase of bidimensionally ordered domains, the appearance of a new sharp oxidation peak at 0.77-0.78 V is more and more evidenced. Thus, CO monolayer oxidation is revealed as a shape dependent reaction for the case of nanoparticles. The influence of the electrochemical surface disordering by oxidation-reduction cycles on the CO oxidation reaction on the different Pt nanoparticles was also studied. After the disordering process, the sharp CO oxidation peak at 0.77-0.78 V disappears, thus agreeing its initial assignment to the CO oxidation on bidimensionally ordered surface domains.

Original languageEnglish
Title of host publicationProceedings - Electrochemical Society
Pages1-11
Number of pages11
VolumePV 2005-11
Publication statusPublished - 2005
Event207th Meeting of The Electrochemical Society Spring 2005 - Quebec City, QC, Canada
Duration: 15 May 200520 May 2005

Conference

Conference207th Meeting of The Electrochemical Society Spring 2005
Country/TerritoryCanada
CityQuebec City, QC
Period15/05/0520/05/05

Keywords

  • CO monolayer oxidation
  • Pt nanoparticles
  • Shape and size effects in electrocatalysis
  • Surface disorder

ASJC Scopus subject areas

  • General Engineering

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