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Electrochemical impedance spectroscopy investigation of spinel type cobalt oxide thin film electrodes in alkaline medium

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Abstract

Spinel type Co3O4 thin films, for the oxygen evolution reaction (OER) in 1 M KOH, have been prepared, on stainless steel supports, using the thermal decomposition method at 400 °C. The electrochemical behaviour of the oxide film/1 M KOH interface was investigated by cyclic voltammetry and impedance techniques. The impedance measurements were carried out at different positive potentials, from the open circuit potential to a potential in the OER region and the electrical equivalent circuit, L (R1Q1) (R2Q2) (R3Q3) was used to fit the experimental results. At each potential, a good correlation between experimental and simulated data is found, thereby validating the proposed equivalent circuit model. The roughness factor value determined in the potential region where the charge transfer reaction is negligible is similar to that obtained by cyclic voltammetry, with a value of 70 ± 2.

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Acknowledgements

The authors gratefully acknowledge support of this work by CNRST (Maroc) and GRICES (Portugal) under a Research Convention project.

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Authors and Affiliations

  1. Laboratoire de Chimie Physique, Faculté des Sciences, Université Ibn Zohr, Cité Dakhla, B.P. 8106, Agadir Maroc, Morocco

    E. Laouini, M. Hamdani, J. Douch & Y. Berghoute

  2. Centro de Ciências Moleculares e Materiais, Faculdade de Ciências da Universidade de Lisboa, Campo Grande Ed. C8, 1749-016, Lisboa, Portugal

    M. I. S. Pereira & M. H. Mendonça

  3. Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi, 221 005, India

    R. N. Singh

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  1. E. Laouini
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  2. M. Hamdani
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  3. M. I. S. Pereira
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  4. J. Douch
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  5. M. H. Mendonça
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  6. Y. Berghoute
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  7. R. N. Singh
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Correspondence to M. Hamdani.

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Laouini, E., Hamdani, M., Pereira, M.I.S. et al. Electrochemical impedance spectroscopy investigation of spinel type cobalt oxide thin film electrodes in alkaline medium. J Appl Electrochem 38, 1485–1494 (2008). https://doi.org/10.1007/s10800-008-9593-4

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  • DOI: https://doi.org/10.1007/s10800-008-9593-4

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