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ECN publication
Title:
Development of cathode materials for low temperature SOFC
 
Author(s):
 
Published by: Publication date:
ECN 1996
 
ECN report number: Document type:
ECN-RX--96-034 Other
 
Number of pages: Full text:
9 Download PDF  

Abstract:
Electrochemical techniques have been used to evaluate the performance ofporous La0.6Sr0.4Co0.2Fe0.8O3-_delta electrodes when used in conjunction with Ce0.9Gd0.1O1.95 electrolytes at 700C in air. Two very distinct regimes of behavior have been identified. At low electrode overpotential a poor performance was observed, and at higher electrode overpotential a transition to a very significantly higher performance regime occurred. Variations in electrode microstructure had the most significant effect on electrode performance in the high performance regime, where the electrodes with the smallest particles exhibited the lowest resistances. Impregnation of the oxide electrode with microcrystalline particles of platinum significantly enhanced the electrode performance. A qualitative interpretation of the results suggest that the onset of the high performance regime at high overpotentials is due to enhanced oxygen transport through the bulk of the electrode. 5 figs., 1 tab., 7 refs.


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