Preparation of Mo03/Pt electrodes by electrodeposition or a direct methanol fuel cell

摘要

Mo0_3/Pt binary catalysts with various Mo/Pt ratios were prepared byan ectrodeposition method for use as the anode in a direct methanol fuel cell. Pt was ectrodeposited onto indium tin oxide (ITO) substrate, and then MoO_3 was elecodeposited from an Mo-peroxo electrolyte on the top of Pt with different depotion times. The crystallinity of synthesized films was analyzed by X-ray diffraction (KRD), and the oxidation state of both the platinum and molybdenum were deterined by X-ray photoelectron spectroscopy (XPS) analyses. Scanning electron icroscopy—energy dispersive X-ray spectroscopy ( SEM/EDS) was employed to vestigate the surface morphology and composition. The catalytic activity and ability for methanol oxidation were measured using cyclic voltammetry and nronoamperometry in a mixture of 0.5 M H_2SO_4 and 0.5 M CH_3OH aqueous elution. Electrocatalytic activity for CO oxidation was also evaluated in a 0.5-M C_2SO_4 solution. The addition of a proper amount of MoO_3 was found to signifiintly improve both the catalyt