nRu⋅mPt⋅(Hx−3n−2mMoO3) composite prepared by surface redox reaction as a highly active electrocatalyst for carbon monoxide and methanol oxidation

Abstract

Abstract A new method for the synthesis of nRu⋅mPt⋅(Hx−3n−2mMoO3) composite based on the redox reaction between the reduced forms of molybdenum bronzes and the solution containing platinum and ruthenium species is proposed. The uniform distribution of Pt and Ru over the electrode surface was observed in the case of their codeposition from the solution containing both platinum and ruthenium compounds. The obtained composite contained platinum mainly in the metallic state, while ruthenium was found in both metallic and oxidized states. The manufactured electrodes were characterized by high catalytic activity in the reactions of carbon monoxide and methanol oxidation. The rate of the methanol oxidation reaction (MOR) on nRu⋅mPt⋅(Hx−3n−2mMoO3) was 4–5 times higher in comparison with that on nPt⋅(Hx−2nMoO3) and ∼30 times higher as compared with that on Pted/GC. On the basis of the obtained data, one can state the additive effect of ruthenium and molybdenum species on methanol electrooxidation.