Issue 40, 2007

On the influence of the metal loading on the structure of carbon-supported PtRu catalysts and their electrocatalytic activities in CO and methanol electrooxidation

Abstract

PtRu (1 : 1) catalysts supported on low surface area carbon of the Sibunit family (SBET = 72 m2 g−1) with a metal percentage ranging from 5 to 60% are prepared and tested in a CO monolayer and for methanol oxidation in H2SO4 electrolyte. At low metal percentage small (<2 nm) alloy nanoparticles, uniformly distributed on the carbon surface, are formed. As the amount of metal per unit surface area of carbon increases, particles start coalescing and form first quasi two-dimensional, and then three-dimensional metal nanostructures. This results in a strong enhancement of specific catalytic activity in methanol oxidation and a decrease of the overpotential for CO monolayer oxidation. It is suggested that intergrain boundaries connecting crystalline domains in nanostructured PtRu catalysts produced at high metal-on-carbon loadings provide active sites for electrocatalytic processes.

Graphical abstract: On the influence of the metal loading on the structure of carbon-supported PtRu catalysts and their electrocatalytic activities in CO and methanol electrooxidation

Article information

Article type
Paper
Submitted
21 May 2007
Accepted
23 Jul 2007
First published
16 Aug 2007

Phys. Chem. Chem. Phys., 2007,9, 5476-5489

On the influence of the metal loading on the structure of carbon-supported PtRu catalysts and their electrocatalytic activities in CO and methanol electrooxidation

A. N. Gavrilov, E. R. Savinova, P. A. Simonov, V. I. Zaikovskii, S. V. Cherepanova, G. A. Tsirlina and V. N. Parmon, Phys. Chem. Chem. Phys., 2007, 9, 5476 DOI: 10.1039/B707598G

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