title: 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 (S(BET) = 72 m(2) g(-1)) with a metal percentage ranging from 5 to 60% are prepared and tested in a CO monolayer and for methanol oxidation in H(2)SO(4) 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.
authors.affiliation: Moscow State University, Russian Federation.
authors.forename: Alexei N
authors.initials: AN
authors.lastname: Gavrilov
authors.forename: Elena R
authors.initials: ER
authors.lastname: Savinova
authors.forename: Pavel A
authors.initials: PA
authors.lastname: Simonov
authors.forename: Vladimir I
authors.initials: VI
authors.lastname: Zaikovskii
authors.forename: Svetlana V
authors.initials: SV
authors.lastname: Cherepanova
authors.forename: Galina A
authors.initials: GA
authors.lastname: Tsirlina
authors.forename: Valentin N
authors.initials: VN
authors.lastname: Parmon