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An EQCM investigation of charging RuO2 thin films prepared by the polymeric precursor method

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Abstract

An electrochemical quartz crystal microbalance (EQCM) study of RuO2 thin films, prepared by the sol-gel precursor method, is presented. The X-ray diffraction (XRD) analysis demonstrates that RuO2 films were crystallized in the rutile phase and scanning electron microscopy investigations indicated the formation of a smooth surface. Cyclic voltammetry and EQCM studies were performed simultaneously in order to investigate the charging processes of the RuO2 films in 0.1 M HClO4. The voltammetric and mass versus potential responses present three well-defined regions associated with the RuO2 redox couples. Based on these results and on the mass-charge relationships, the corresponding charging mechanisms are proposed. In the potential region governed by the Ru3+/Ru4+ redox couple, the mass-charge relation can be associated with the double-injection of protons and electrons. The other regions correspond to water release and oxyhydroxide species formation during charging.

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Acknowledgements

The authors thank the Brazilian research funding institutions, CNPq and FAPESP.

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Authors and Affiliations

  1. Laboratório Interdisciplinar de Eletroquímica e Cerâmica, Centro Multidisciplinar para o Desenvolvimento de Materiais Cerâmicos, Departamento de Química, Universidade Federal de São Carlos Rodovia Washington Luiz, CEP: 13565–905, São Carlos, SP, Brazil

    M. C. Santos, A. J. Terezo, V. C. Fernandes, E. C. Pereira & L. O. S. Bulhões

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  1. M. C. Santos
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  2. A. J. Terezo
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  3. V. C. Fernandes
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  4. E. C. Pereira
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  5. L. O. S. Bulhões
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Correspondence to L. O. S. Bulhões.

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Santos, M.C., Terezo, A.J., Fernandes, V.C. et al. An EQCM investigation of charging RuO2 thin films prepared by the polymeric precursor method. J Solid State Electrochem 9, 91–95 (2005). https://doi.org/10.1007/s10008-004-0512-2

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  • DOI: https://doi.org/10.1007/s10008-004-0512-2

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