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New electrocatalytic materials based on mixed metal oxides: electrochemical quartz crystal microbalance characterization

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Abstract

An electrochemical Quartz Crystal Microbalance (EQCM) was used to characterize a mixed metal oxide electrocatalyst, Ir0.15Sn0.85O2, for the Oxygen Evolution Reaction (OER) in acidic medium in the potential range of the pseudo-capacitance reaction, from 0.4 to 1.2 V versus Reversible Hydrogen Electrode (RHE). The EQCM gold tip was characterized in H2SO4 0.05 M and HClO4 0.1 M. Subsequently, Ir0.15Sn0.85O2 powder, synthesized by a sol–gel route, was supported on the tip gold surface for investigations in the same media. The simultaneous measurements of mass variation and current density as functions of potential led to the identification of the chemical species involved in the mass transfer between the oxide and the acidic solution during the pseudo-capacitance reaction.

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Acknowledgements

The financial support by the Oronzio e Niccolò De Nora Foundation, MUR-The University of Milan (FIRST funds) and Fondazione Monte dei Paschi di Siena are gratefully acknowledged.

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Author notes

  1. L. Borgese

    Present address: Department of Mechanical and Industrial Engineering, The University of Brescia, Via Branze 38, 25123, Brescia, Italy

  2. C. Pezzoni

    Present address: Industrie De Nora SpA, Via Bistolfi 35, 20134, Milan, Italy

Authors and Affiliations

  1. Department of Physical Chemistry and Electrochemistry, University of Milan, via Golgi 19, 20133, Milan, Italy

    A. Vertova, L. Borgese, G. Cappelletti, C. Locatelli, A. Minguzzi, C. Pezzoni & S. Rondinini

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  1. A. Vertova
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  2. L. Borgese
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Correspondence to A. Vertova.

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Vertova, A., Borgese, L., Cappelletti, G. et al. New electrocatalytic materials based on mixed metal oxides: electrochemical quartz crystal microbalance characterization. J Appl Electrochem 38, 973–978 (2008). https://doi.org/10.1007/s10800-008-9510-x

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  • DOI: https://doi.org/10.1007/s10800-008-9510-x

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