The ionic current-overpotential characteristics of cathodes on ceria-based electrolytes have been evaluated by galvanostatic current-interruption measurements under fuel cell operating conditions. The effect of either mixed ionic electronic conductivity or high oxygen diffusivity on the oxygen reduction kinetics was investigated. La0.8Sr0.2MnO3 served as a model substance for cathodes with a high activity for oxygen reduction and a low oxygen ionic conductivity. The behaviour of La0.8Sr0.2MnO3 is compared to that of La0.84Sr0.16CoO3 which shows high activity for oxygen reduction and high oxygen diffusivity.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics