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Kinetic and mechanistic study of methanol oxidation on a Pt(100) surface in alkaline media1
Authors:A.V. Tripković  K.Dj. Popović  J.D. Momčilović  D.M. Dražić
Affiliation:ICTM-Institute of Electrochemistry, University of Belgrade, P.O.B. 815, Belgrade, Yugoslavia
Abstract:A comparative study of methanol oxidation on a Pt(100) surface was carried out in bicarbonate, carbonate and different pH values of sodium hydroxide solutions. It was shown that Pt(100) adsorbs OH and `poisoning species'. The surface activity was directly correlated to the OHad species coverage. The `poisoning species', produced in methanol oxidation, participate in the reaction at higher potentials, but block the surface partially at lower potentials. A dual path reaction mechanism, common to all the alkaline solutions used, was proposed based on the assumptions that HCO is a reactive intermediate and that a formate is a reaction product in the main path, while CO2 is a product of `poisoning species' oxidation in a parallel reaction path.
Keywords:Pt(100) electrode  Methanol oxidation  Alkaline solutions  OH adsorption  Reaction mechanism
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