Abstract: SnO₂-TiO₂ thin films were deposited on the activated glassy carbon electrodes by vacuum coating method. Au-Pt/SnO₂-TiO₂/GC composite electrode was prepared by reducing HAuCl₄ and H₂PtCl₆ mixture solution and sediment Au-Pt bimetallic nanoparticles successively on the SnO₂-TiO₂/GC.The effect of SnO₂-TiO₂ film support on the electrocatalytic properties of Au-Pt nanoparticles was characterized via cyclic voltograme method. The morphological and structural properties of Au-Pt nanoparticles self-assembled on SnO₂-TiO₂ film were characterized via Scanning Electron Microscope and X-ray Photoelectron Spectroscopy. The results show that the compact and uniformed 10 nm Au-Pt nanoparticles were self-assembled on SnO₂-TiO₂ film. The ability of anti-CO poisoning was enhanced with the function of SnO₂-TiO₂ support. The form of Au-Pt alloy enhanced the electrocatalytic oxidation of methanol in acidic system. Furthermore, the increase of d vacancy with the function of SnO₂-TiO₂ support improved the stability and catalytic property of Au-Pt bimetallic nanoparticles.

Key words: Au-Pt nanoparticles, SnO₂-TiO₂ film, Anti-CO poisoning, Oxidation of methanol