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Issue 44, 2008
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Autocatalysis in the open circuit interaction of alcohol molecules with oxidized Pt surfaces

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Abstract

We studied the open circuit interaction of methanol and ethanol with oxidized platinum electrodes using in situ infrared spectroscopy. For methanol, it was found that formic acid is the main species formed in the initial region of the transient and that the steep decrease of the open circuit potential coincides with an explosive increase in the CO2 production, which is followed by an increase in the coverage of adsorbed CO. For ethanol, acetaldehyde was the main product detected and only traces of dissolved CO2 and adsorbed CO were found after the steep potential decay. In both cases, the transients were interpreted in terms of (a) the emergence of sub-surface oxygen in the beginning of the transient, where the oxide content is high, and (b) the autocatalytic production of free platinum sites for lower oxide content during the steep decay of the open circuit potential.

Graphical abstract: Autocatalysis in the open circuit interaction of alcohol molecules with oxidized Pt surfaces

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Article information


Submitted
10 Jul 2008
Accepted
19 Aug 2008
First published
30 Sep 2008

Phys. Chem. Chem. Phys., 2008,10, 6686-6692
Article type
Paper

Autocatalysis in the open circuit interaction of alcohol molecules with oxidized Pt surfaces

B. C. Batista, E. Sitta, M. Eiswirth and H. Varela, Phys. Chem. Chem. Phys., 2008, 10, 6686
DOI: 10.1039/B811787J

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