Journal of Applied Electrochemistry

, Volume 13, Issue 3, pp 395–400 | Cite as

Hysteresis effects with ZrO2 oxygen sensors exposed to non-equilibrium oxygen-hydrocarbon mixtures

  • J. E. Anderson
  • Y. B. Graves


Hysteresis effects are reported for ZrO2 oxygen sensors exposed to non-equilibrium oxygen/hydrocarbon gas mixtures. With oxygen/toluene at 800° C, voltage-composition curves differ following composition changes (a) from excess oxygen to excess toluene and (b) from excess toluene to excess oxygen. A catalysis model is developed to account for this behaviour: the Thiele modulus of the catalyst/electrode is presumed to differ under (a) net oxidizing and (b) net reducing conditions. Large scale voltage fluctuations, sometimes exceeding 400 mV, were observed in experiments with oxygen/isobutane mixtures at 600° C. This behaviour is analysed in terms of a kinetic model involving stochastic variations of relative mass transfer coefficients of oxygen and isobutane.


Mass Transfer Catalysis Transfer Coefficient Kinetic Model Mass Transfer Coefficient 
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Copyright information

© Chapman and Hall Ltd. 1983

Authors and Affiliations

  • J. E. Anderson
    • 1
  • Y. B. Graves
    • 1
  1. 1.Research Ford Motor CompanyDearbornUSA

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