Cathode Materials for Reduced-Temperature SOFCs

James M. Ralph (1) , Cécile Rossignol (1) , Romesh Kumar (1)

1 Electrochemical Technology Program, Chemical Engineering Division

The progress toward a commercial solid oxide fuel cell (SOFC) continues to be a slow struggle due to materials, stacking, and system challenges. One long-term challenge has been the search for suitable cathode materials for use on intermediate (650-800°C) yttria-stabilized zirconia (YSZ) electrolytes and low-temperature (500-650°C) gadolinia-doped ceria (CGO) electrolytes. The present study has identified La(Sr)FeO3 and possibly Pr(Sr)FeO3 as potential cathode materials for YSZ. A La-deficient La(Sr)FeO3 cathode has achieved an area-specific resistance of 0.1 cm2 at 800°C, with stable long-term performance. On CGO, Pr(Sr)CoO3, Gd(Sr)CoO3, and Sr(Co/Fe)1.5O3.25 have all achieved an area-specific resistance close to 0.1 cm2 at 650°C, with relatively stable long-term performance, but further reduction in temperature to 600°C is necessary for efficient CGO operation.

Mots clés: solid oxide fuel cells; electrochemical electrodes

Domaines: Matériaux

James M. Ralph, Cécile Rossignol, Romesh Kumar. Cathode Materials for Reduced-Temperature SOFCs. Journal of The Electrochemical Society, 2003, 150 (11), pp. A1518-A1522. ⟨10.1149/1.1617300⟩. ⟨hal-00418034⟩