Lattice gas model for CO electrooxidation on Pt-Ru bimetallic surfaces

M.T.M. Koper, J.J. Lukkien, A.P.J. Jansen, R.A. Santen, van

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

148 Citaten (Scopus)
5 Downloads (Pure)


We propose a lattice gas model for the carbon monoxide oxidation on platinum-ruthenium electrode surfaces. The kinetic model includes the main mechanistic "bifunctional" features as they are generally agreed upon in the literature. The CO stripping voltammetry is solved by dynamic Monte Carlo simulations. For a randomly dispersed alloy of Ru and Pt, the model gives a satisfactory semiquantitative agreement with the experimental CO stripping results of Gasteiger et al. [J. Phys. Chem. 1994, 98, 617]. It is shown how the bifunctional mechanism cannot operate if CO is not mobile on the surface, and a simple Tafel-type experiment with a low concentration of active Pt-Ru sites is suggested to check quantitatively the CO mobility rate. On a surface with large Ru islands, the overpotential for CO oxidation increases, and two CO stripping peaks may appear if the CO mobility is sufficiently low. A mean-field model of the system reproduces the DMC results for high CO mobility but breaks down for a system with large Ru islands and a comparatively low CO surface diffusion constant.
Originele taal-2Engels
Pagina's (van-tot)5522-5529
Aantal pagina's8
TijdschriftJournal of Physical Chemistry B
Nummer van het tijdschrift26
StatusGepubliceerd - 1999


Duik in de onderzoeksthema's van 'Lattice gas model for CO electrooxidation on Pt-Ru bimetallic surfaces'. Samen vormen ze een unieke vingerafdruk.

Citeer dit