Journal
ELECTROCHIMICA ACTA
Volume 54, Issue 8, Pages 2203-2208Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.10.034
Keywords
Alkaline; Direct ethanol fuel cell (DEFC); Ethanol oxidation reaction (EOR); Mechanism; Palladium
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Funding
- Council of the Hong Kong Special Administrative Region, China [622706]
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In this work, the mechanism of the ethanol oxidation reaction (EOR) on a palladium electrode was studied using the cyclic voltammetry method. The dissociative adsorption of ethanol was found to proceed rather quickly and the rate-determining step was the removal of the adsorbed ethoxi by the adsorbed hydroxyl on the Pd electrode. The Tafel slope was found to be 130mV dec(-1) at lower potentials, which suggests that the adsorption of OH- ions follows the Temkin-type isotherm on the Pd electrode. In comparison, the Tafel slope increased gradually to 250 mV dec(-1) at higher potentials. The change in the Tafel slope indicated that, at higher potentials, the kinetics is not only affected by the adsorption of the OH- ions, but also by the formation of the inactive oxide layer on the Pd electrode. (C) 2008 Elsevier Ltd. All rights reserved.
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