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Thin films of Co3O4 and NiCo2O4 obtained by the method of chemical spray pyrolysis for electrocatalysis III. The electrocatalysis of oxygen evolution

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Abstract

The electrocatalytic properties of thin Co3O4 and NiCo2O4 films prepared on CdO-nonconductive glass by the method of chemical spray pyrolysis were investigated for oxygen evolution in varying KOH concentrations. The Tafel slopes were close to (2.3RT/F) V per decade for both oxides. The reaction order with respect to [OH−] was found to be approximately 1.3. It was observed that Co3O4 is more active than NiCo2O4 towards oxygen evolution. A mechanism for oxygen evolution involving the electrochemical adsorption of OH− as a fast step and the electrochemical desorption of OH forming an intermediate H2O2 as the rate-determining step has been suggested.

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Author notes

  1. R. -N. Singh

    Present address: Department of Chemistry, Banaras Hindu University, 221005, Varanasi, India

  2. J. L. Gautier

    Present address: Departamento de Quimica, Faculdad de Ciencia, Universidad de Santiago de Chile, Casilla 5659, Santiago 2, Chile

Authors and Affiliations

  1. Laboratoire d'Electrochimie et de Chimie-Physique du Corps Solide, U.R.A. au C.N.R.S. No 405, Université Louis Pasteur, 4 rue Blaise Pascal, 67000, Strasbourg, France

    R. -N. Singh, M. Hamdani, J. -F. Koenig, G. Poillerat, J. L. Gautier & P. Chartier

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  1. R. -N. Singh
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  2. M. Hamdani
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  5. J. L. Gautier
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Singh, R.N., Hamdani, M., Koenig, J.F. et al. Thin films of Co3O4 and NiCo2O4 obtained by the method of chemical spray pyrolysis for electrocatalysis III. The electrocatalysis of oxygen evolution. J Appl Electrochem 20, 442–446 (1990). https://doi.org/10.1007/BF01076053

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  • DOI: https://doi.org/10.1007/BF01076053

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