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Ionics

, Volume 1, Issue 5–6, pp 504–513 | Cite as

Oxygen electrodes of zirconia electrolytes: fundamentals and application to analysis of oxygen containing gases

  • G. Reinhardt
  • V. Baitinger
  • W. Göpel
Article

Abstract

The kinetics of the oxygen exchange reaction and the reduction of NO at La0.8Sr0.2CoO3−, La0.8Sr0.2MnO3− and Ag-electrodes on stabilized zirconia (8mol% Y203=YSZ) has been studied by means of electrochemical methods (impedance, I-U characteristics). For La0.8Sr0.2CoO3 electrodes the oxygen exchange was found to proceed via the bulk of the electrode with a rate limiting oxygen exchange at the electrode surface. Electrodes based on La0.8Sr0.2MnO3 change their electrode characteristics with the applied potential. At low cathodic polarization the electrode reaction is limited to the three-phase boundary electrode/YSZ/gas. At high cathodic potentials oxygen vacancies are created and consequently additional oxygen is exchanged via the electrode bulk. Furthermore, a significant NO reduction was observed which indicate a reaction with the oxygen vacancies at the electrode surface. For Ag a rate limiting transport of oxygen atoms through the bulk of the electrode was found. As a consequence the oxygen concentration at the electrode surface remains nearly constant. In this context, the observed inactivity for the NO reduction of Ag-electrodes may be explained.

Keywords

Zirconia Oxygen Atom Electrode Surface Oxygen Vacancy Electrode Reaction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© IfI - Institute for Ionics 1995

Authors and Affiliations

  • G. Reinhardt
    • 1
  • V. Baitinger
    • 1
  • W. Göpel
    • 1
  1. 1.Institute of Physical and Theoretical Chemistry University of TübingenTübingenGermany

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