Effect of microstructure on the electrochemical behavior of Pt/YSZ electrodes |
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| Authors: | A Jaccoud G Fóti R Wüthrich H Jotterand Ch Comninellis |
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| Affiliation: | (1) Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland;(2) Institute of Manufacturing Systems and Robotics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland;(3) Institute of Physics of the Complex Matter, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland |
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| Abstract: | 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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| Keywords: | Pt/YSZ cermet electrode Pt film electrode microstructure cyclic voltammetry chronoamperometry |
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