Abstract
Methanol electro-oxidation reaction is a widely studied system due to its applicability in electrochemical devices for energy conversion, such as direct methanol fuel cells. Nevertheless, the effect of some kinetic parameters on the overall reaction rate is still unclear and the reaction mechanism is controversial. Herein we investigate the electro-oxidation of methanol on platinum by means of a micro-kinetic approach using the mean-field approximation. The resulting model, c.f. Figure 1, is based on data, namely spectroscopic and electrochemical, available in the literature, and translated into a set of ordinary differential equations. Simulations are carried out in comparison with experimental results, including cyclic voltammetry, chronamperometry and potential oscillations under galvanostatic control. The numerical simulations agree satisfactorily with the experimental results with a set of realistic reaction rates in the elemental reaction steps for the electrooxidation of methanol in platinum. The values of the rate coefficients show the adsorption of methanol and the first steps after the formation of formic acid as the fastest, while the desorption of bridge adsorbed formic acid and the chemical adsorption and desorption of methylformate as the fastest steps. Figure 1
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