In-situ vibrational spectroscopy on Pt electrocatalysts

K. A. Friedrich, F. Henglein, U. Stimming, W. Unkauf

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

CO adsorption on structurally very different electrocatalysts, namely carbon supported Pt catalysts and adsorbed colloids on surfaces (a model system), has been studied. From a comparison of the spectra of CO monolayers on these disparate electrocatalysts, conclusions can be derived regarding the structure of the particles. A correlation between CO vibrational frequency and structural properties, e.g. isolated particles versus agglomerated particles, is found. A dependence of vibrational frequency on the particle coverage is assigned to an increasing agglomeration with increasing Pt-coverage. The spectra of the technical electrocatalysts can be explained in terms of the simpler model systems.

Original languageEnglish
Pages (from-to)689-694
Number of pages6
JournalElectrochimica Acta
Volume47
Issue number5
DOIs
StatePublished - 3 Dec 2001

Keywords

  • CO adsorption
  • Colloids
  • Electrocatalysts

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