Journal
ELECTROCHIMICA ACTA
Volume 54, Issue 26, Pages 6140-6147Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.05.066
Keywords
Electrochemical incineration; Theoretical model; Anodic organics oxidation; Metal oxide anodes; Oxygen evolution; DSA
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Funding
- Universita di Palermo and Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR)
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The electrochemical oxidation of organics in water at metal oxide electrodes was investigated with the aim to discuss the correlations between the instantaneous current efficiency ICE and operative conditions by considering both the hypothesis of a direct oxidation process and of an indirect process mediated by adsorbed hydroxyl radicals or chemisorbed oxygen, in order to explicit the main differences expected between these cases. Thus, a simple theoretical model was discussed, as an extension of previous studies of Comnnellis and co-workers which were focused on indirect oxidation paths [C. Comninellis, Electrochim. Acta 39 (1994) 1857; O. Simond, V. Schaller, Ch. Comninellis, Electrochim. Acta, 42 (1997) 20091, concerning both the cases of mass transfer control and oxidation reaction control and mixed kinetic regimes. A very good agreement, between theoretical predictions and experimental data pertaining to the electrochemical oxidation of oxalic and formic acid at IrO(2)-Ta(2)O(5), was observed. (C) 2009 Elsevier Ltd. All rights reserved.
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