Oxygen Reduction at a Stabilized Zirconia Interface with Y1−xCaxMnO3 or La1−xSrxMnO3 Cathode Materials
Open Access
- 1 January 1993
- journal article
- Published by The Electrochemical Society in ECS Proceedings Volumes
- Vol. 1993-4 (1) , 585-597
- https://doi.org/10.1149/199304.0585pv
Abstract
Impedance spectroscopy, combined with an unbonded interface cell, has been used to assess oxygen reduction behavior at interfaces between an yttria-stabilized zirconia electrolyte and perovskite or platinum cathode materials. Intrinsic oxygen reduction specific activities of Y1−xCaxMnO3 (x = 0.5, 0.6 and 0.7) and La1−xSrxMnO3 (x = 0.1 and 0.3) were determined as a function of temperature and oxygen partial pressure, independent of the interface morphology. The overall cathodic interfacial polarization consists of two or more fundamental processes. In the temperature range of 900–1000°C and in air, the operating conditions for a solid oxide fuel cell, charge transfer and oxygen dissociation processes were approximately equivalent relative to the overall oxygen reduction kinetics.Keywords
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