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CO monolayer oxidation on Pt nanoparticles: Further insights into the particle size effects

2006; Elsevier BV; Volume: 599; Issue: 2 Linguagem: Inglês

10.1016/j.jelechem.2006.02.024

1873-2569

Frédéric Maillard, Elena R. Savinova, Ulrich Stimming,

Catalysis and Oxidation Reactions

This paper provides further insights into the particle size effects in CO monolayer oxidation. Strong particle size effects are confirmed in the size range from 1.8 to 5 nm. The discrepancies in the literature concerned with the particle size effects in CO monolayer oxidation are reconciled by exploring the influence of the experimental conditions on the stripping voltammograms and chronoamperograms. Evidence supporting the contribution of slow non-electrochemical step to the overall mechanism of CO oxidation is presented. The particle size effects in CO monolayer oxidation are attributed to the size-dependent COads + OHads interaction as well as to the size-dependent COads surface diffusion coefficient.