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Mechanistic study of C12 evolution at Ti-supported Co3O4 anodes

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Abstract

Co3O4 layers were prepared by thermal decomposition of Co(NO3)2 at various temperatures in the range 200–500° C on a Ti support with and without an interlayer of RuO2. Kinetic studies were carried out with and without dissolved Cl2 at various partial pressures in NaCl solutions of concentration in the range 0.5–5 mol dm−3. The effect of the solution pH was especially investigated. Kinetic measurements were carried out both close to and far from equilibrium. The following parameters were determined: transfer coefficient, Tafel slope, stoichiometric number, reaction orders with respect to Cl−, H+ and surface sites, activation energy. The most intriguing feature observed was the retarding effect of acidity on the anodic Cl2 reaction. This has been ascribed to the complex surface behaviour of oxides in solution. A detailed mechanistic scheme has been proposed and discussed. The stability of the oxide surface was monitored by measuring the voltammetric charge in alkaline solution after sets of experiments.

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Author notes

  1. A. Carugati

    Present address: Assoreni, San Donato Milanese, Milan, Italy

  2. G. Lodi

    Present address: Chemical Institute, University of Ferrara, Ferrara, Italy

Authors and Affiliations

  1. Department of Physical Chemistry and Electrochemistry, University of Milan, Via Venezian 21, 20133, Milan, Italy

    R. Boggio, A. Carugati, G. Lodi & S. Trasatti

Authors
  1. R. Boggio
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  2. A. Carugati
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  3. G. Lodi
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  4. S. Trasatti
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Boggio, R., Carugati, A., Lodi, G. et al. Mechanistic study of C12 evolution at Ti-supported Co3O4 anodes. J Appl Electrochem 15, 335–349 (1985). https://doi.org/10.1007/BF00615986

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  • DOI: https://doi.org/10.1007/BF00615986

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