nPt~0 (H_(x-2n)MoO_3) as a promising catalyst for the oxidation of methanol. Synthesis and electrocatalytic properties

摘要

A new method for the synthesis of the catalyst systems Pt-Mo was suggested. nPt~0(H_(x-2n)MoO_3)/GC electrodes were prepared by a redox reaction between the hydrogen-containing molybdenum bronzes and potassium tetrachloroplatinate (Ⅱ) in acid solutions at open circuit potential. The electrodes were characterized by CVA, SEM, X-ray microanalysis, XRD, XPS and ICP-AES. Pt~0conglomerates formation with nonuniform distribution over the molybdenum bronzes surface has been revealed. nPt~0(H_(x-2n)MoO_3)/GC electrodes showed high catalytic activity (not inferior to Pt-Ru-catalyst) in the oxidation of carbon monoxide and methanol as compared with Pt/GC-electrodes. Catalytic effect is apparently achieved by effective oxidation of strongly chemisorbed species (CO_(ads), HCO_(ads)), which occurs at boundaries platinum - molybdenum oxide. Therefore nPt~0(H_(x-2n)MoO_3) can be considered as one of perspective catalysts for DMFC.