Abstract
To evaluate the exchange current I o of the oxygen electrode reaction at the O2 strontium-doped lanthanum manganite (LSM)/yttria stabilized zirconia (YSZ) composite/YSZ interface, the variation of the current I vs overvoltage η is measured at low cathodic and anodic polarizations (−50 to 30 mV). A linear behavior is observed within this potential domain with a unique slope. Taking into account of the dissociative adsorption of the oxygen molecule on the LSM electrocatalyst surface and the charge transferred at the triple-phase boundary, the exchange current is evaluated to 2.93 mA in air at 747 °C.
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Acknowledgements
The authors would like to thank Dr A.-L. Sauvet and Dr C. Roux for their support and their fruitful advice in the realization of this work. This work has been carried out in collaboration with the Laboratoire de Physique des Matériaux, Faculté des Sciences de Bizerte Zarzouna, Tunisia.