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Issue 4, 2009
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Temperature effects on the oscillatory electro-oxidation of methanol on platinum

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Abstract

We report in this paper the effect of temperature on the oscillatory electro-oxidation of methanol on polycrystalline platinum in aqueous sulfuric acid media. Potential oscillations were studied under galvanostatic control and at four temperatures ranging from 5 to 35 °C. For a given temperature, the departure from thermodynamic equilibrium does not affect the oscillation period and results in a slight increase of the oscillation amplitude. Apparent activation energies were also evaluated in voltammetric and chronoamperometric experiments and were compared to those obtained under oscillatory conditions. In any case, the apparent activation energies values fell into the region between 50 and 70 kJ mol−1. Specifically under oscillatory conditions an apparent activation energy of 60 ± 3 kJ mol−1 and a temperature coefficient q10 of about 2.3 were observed. The present findings extend our recently published report (J. Phys. Chem. A, 2008, 112, 4617) on the temperature effect on the oscillatory electro-oxidation of formic acid. We found that, despite the fact that both studies were carried out under similar conditions, unlike the case of formic acid, only conventional, Arrhenius, dynamics was observed for methanol.

Graphical abstract: Temperature effects on the oscillatory electro-oxidation of methanol on platinum

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Publication details

The article was received on 08 Jul 2008, accepted on 08 Sep 2008 and first published on 29 Oct 2008


Article type: Paper
DOI: 10.1039/B811636A
Citation: Phys. Chem. Chem. Phys., 2009,11, 665-670
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    Temperature effects on the oscillatory electro-oxidation of methanol on platinum

    E. A. Carbonio, R. Nagao, E. R. Gonzalez and H. Varela, Phys. Chem. Chem. Phys., 2009, 11, 665
    DOI: 10.1039/B811636A

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