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Oxygen ion conductivity of platinum-impregnated stabilized zirconia in bulk and microporous materials

Authors

  • Dr. Andreas Ziehfreund,

    1. Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1, D-45470 Mülheim a. d. Ruhr (Germany)
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  • Dr. Ulrich Simon,

    1. Institut für Anorganische Chemie Universität Essen Schützenbahn 70, D-45127 Essen (Germany)
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  • Prof. Wilhelm F. Maier

    Corresponding author
    1. Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1, D-45470 Mülheim a. d. Ruhr (Germany)
    • Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1, D-45470 Mülheim a. d. Ruhr (Germany)
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  • We wish to thank Prof. G. Schön for access to his impedance spectrometer, Dr. H. Wiggers for the performance of measurements, and the BMFT, grant No. 03C257B, for financial support.

Abstract

The effect of platinum impregnation on the ionic conductivity of yttria stabilized zirconia (YSZ) has been determined using complex impedance measurements in the frequency range 101–107Hz. Ionic conductivities and the corresponding activation enthalpies are reported for the temperature range 200–600°C. Platinum agglomerated at the grain boundaries of polycrystalline samples reduces ion transport across the intergranular zone. The evaporation and recondensation of YSZ and the addition of Pt results in porous materials with improved oxygen ion conductivity.

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