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Methanol oxidation at platinum electrodes in acid solution: Comparison between model and real catalysts

Tripković A.V. (IHTM-Centar za elektrohemiju, Beograd)
Gojković S.LJ. (Tehnološko-metalurški fakultet, Beograd)
Popović K.Đ. (IHTM-Centar za elektrohemiju, Beograd)
Lović J.D. (IHTM-Centar za elektrohemiju, Beograd)

Methanol oxidation in acid solution was studied at platinum single crystals, Pt(hkl), as the model catalyst, and at nanostructural platinum supported on high surface area carbon, Pt/C, as the real catalyst. The linear extrapolation method was used to determine the beginning of hydroxyl anion adsorption. Structural sensitivity of the adsorption was proved and a correlation with the onset of the methanol oxidation current was established at all catalysts. Bisulfate and chloride anions were found to decrease the methanol oxidation rate, but probably did not influence the reaction parth. The specific activity for the reaction increased in the sequence Pt(110)

Keywords: methanol oxidation, Pt(hkl), Pt supported catalyst, acid solution