Impedance and Voltage Relaxation Studies of the Oxygen Sensor Systems Pt/O2/YSZ, Pt/O2/TiO2 and Pt/O2/δ-Bi2O3

  • B. Leibold
  • N. Nicoloso
Part of the NATO ASI Series book series (ASIC, volume 276)


The oxygen sensor systems Pt/O2/YSZ, Pt/O2/TiO2 and Pt/O2/δ-Bi2O3 have been investigated by impedance and voltage relaxation measurements. Mainly single crystal and thin film oxide materials were used.

In the case of single crystal YSZ, the oxygen exchange reaction involves at least two interrelated reaction steps at the Pt or YSZ interface. Dissociative adsorption and incorporation of O or O are believed to account for this behaviour. However, no final reaction model can be given on the basis of the electrochemical data. Polycrystalline TZP can be described by a barrier layer model with grain boundary layers ≪ 100 Å. Current fractal models are not suited to describe the Pt/O2/YSZ system. In this context, recent results on the CPE behaviour of the impedance and its possible fractal origin are briefly reviewed. In addition, a short introduction to impedance spectroscopy is given.

For single crystal TiO2 the surface excess conductivity follows a <inline>1</inline> dependence which indicates adsorption and incorporation of mono-atomic oxygen species like O or O. Thin polycrystalline films (300 ≤ d ≤ 104 Å) show no significant surface contribution. Probably, the surface and bulk defect structure is dominated by the same kind of defects (VO¨, Ti<Stack><Subscript>i</Subscript><Superscript>4</Superscript></Stack>), whose concentrations or mobilities appear to differ within only one order of magnitude.

In the case of Pt/O2/δ-Bi2O3, preliminary voltage relaxation studies indicate that the diffusion coefficient of the minority carriers exceeds the ionic diffusion coefficient by several orders of magnitude. This is the same behaviour as seen in the YSZ system.


Fractal Dimension Equivalent Circuit Impedance Spectrum Solid State Ionic Constant Phase Element 
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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • B. Leibold
    • 1
  • N. Nicoloso
    • 1
  1. 1.Max-Planck-Institut Für FestkörperforschungStuttgart 80Germany

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