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Effect of microstructure on the electrochemical behavior of Pt/YSZ electrodes

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Two types of O2,Pt/YSZ electrode preparation (Pt/YSZ cermet and sputtered platinum film) have been characterized by SEM and by cyclic voltammetry and chronoamperometry at 450 °C in 20 kPa oxygen. Cyclic voltammetry on the cermet and on the as-sputtered non-porous film electrode evidenced the characteristics of the PtO x /Pt couple. The corresponding redox reaction occurs at the metal/electrolyte interface and it manifests itself by an anodic wave and one of more cathodic peaks in the voltammogram. Heat treatment of the sputtered electrode at 700 °C in oxygen atmosphere resulted in a porous structure by coalescence of the film. Cyclic voltammetry of the porous film electrode featured the characteristics of the O2/O2− couple, i.e. the redox reaction of gaseous oxygen occurring at the tpb. Chronoamperometry at anodic potentials showed similar features for both electrode preparations: an initial inhibition, a current peak and a slow activation, the latter being related to the phenomenon of electrochemical promotion of catalysis.

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Authors and Affiliations

  1. Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland

    A. Jaccoud, G. Fóti & Ch. Comninellis

  2. Institute of Manufacturing Systems and Robotics, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland

    R. Wüthrich

  3. Institute of Physics of the Complex Matter, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland

    H. Jotterand

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  1. A. Jaccoud
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  2. G. Fóti
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  3. R. Wüthrich
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  5. Ch. Comninellis
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Correspondence to G. Fóti.

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Jaccoud, A., Fóti, G., Wüthrich, R. et al. Effect of microstructure on the electrochemical behavior of Pt/YSZ electrodes. Top Catal 44, 409–417 (2007). https://doi.org/10.1007/s11244-006-0133-3

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