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Even if a bimetallic catalyst is used in electro-oxidation of methanol the assumption was made that all adsorbates diffuse quickly to the interface between both catalysts. It can thus be considered that all reactions occur on the site kind of site. The methanol decomposition was investigated by Gokhale et al [24] who reported a mechanism for decomposition of methanol on copper. The mechanism needed to be adapted to the electro-chemical reaction that was studied. Original steps which form adsorbed hydrogen were considered as electrochemical. Consequently, they form a hydronium ion and an electron. The assumption that all these steps become electrochemical is certainly not true. However, it makes a good starting point. The mechanism contains twelve steps for OR1: s1: CH3OH CH3OHS s2: CH3OHS + H2O CH3OS + H3O+ + e- s3: CH3OS + H2O CH2OS + H3O+ + e- s4: CH2O+ H2O HCOS + H3O+ + e- s5: HCOS + H2O COS + H3O+ + e- s6: CH3OHS + H2O H2COHS + H3O+ + e- s7: H2COHS + H2O HCOHS + H3O+ + e- s8: HCOHS + H2O COHS + H3O+ + e- s9: COHS + H2O COS + H3O+ + e- s10: HCOHS + H2O COS + 2H3O+ + e- s11: H2COHS + H2O CH2OS + H3O+ + e- s12: COS CO + S Methanol is dehydrogenated to form different intermediates. For the same chemical formula, adsorbates can have different structures. All those steps are considered to occur on platinum. Fishtik et al [22] reported a mechanism for the Water-Gas Shift Reaction on copper. It was slightly changed to be adapted to the electro-oxidation that occurs in a methanol fuel cell. Steps which form adsorbed hydrogen were again considered as electrochemical. - 86 -PDF Image | Direct Methanol Fuel Cell (DMFC) Performance
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