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

Frédéric Maillard (1) , Elena R. Savinova (2) , Ulrich Stimming (3)

1 LEPMI - Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces
2 Boreskov Institute of Catalysis
3 Physik Department E19

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 CO_ads + OH_ads interaction as well as to the size-dependent COads surface diffusion coefficient.

Mots clés: Pt nanoparticles; CO monolayer electrooxidation; Particle size effects; CO_ads surface mobility; Cyclic voltammetry; Chronoamperometry

Domaines: Matériaux

Frédéric Maillard, Elena R. Savinova, Ulrich Stimming. CO monolayer oxidation on Pt nanoparticles: Further insights into the particle size effects. Journal of electroanalytical chemistry and interfacial electrochemistry, 2007, 599 (2), pp. 221-232. ⟨10.1016/j.jelechem.2006.02.024⟩. ⟨hal-00333785⟩