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Nanosized platinum–gold alloys clusters have been deposited on gas diffusion electrode by sputter deposition. The deposits were characterized by FE-SEM, TEM and XPS in order to verify the formation of alloy nanoparticles and to study the influence of deposition technique on the nanomorphology. The deposition by sputtering process allowed a uniform distribution of metal particles on porous surface of carbon supports. Typical island growth mode was observed with the formation of a dispersed metal nanoclusters (mean size about 5 nm). Cyclic voltammetry was used to determine the electrochemical active surface and the electrocatalytic performance of the PtAu electrocatalysts for methanol oxidation reaction. The data were re-calculated in the form of mass specific activity (MSA). The sputter-catalyzed electrodes showed higher performance and stability compared to commercial catalysts.
American Scientific Publishers
Publication date: 
1 Oct 2011

L Giorgi, R Giorgi, S Gagliardi, E Serra, M Alvisi, MA Signore, E Piscopiello

Biblio References: 
Volume: 11 Issue: 10 Pages: 8804-8811
Journal of nanoscience and nanotechnology