Title: Evaluation of Potential Cathode Materials for SOFC Operation Between 500–800°C
Abstract: With the drive to lower operating temperatures for the solid oxide fuel cell, several critical components within each cell require further improvement. Arguably, the cathode requires the greatest improvement. Several very promising cathode materials are identified in this paper for use with electrolytes of either yttria-stabilized zirconia (YSZ) or gadolinia-doped ceria (CGO). An initial target areal resistance of <1 Ω · cm2 has been achieved at operating temperatures of 650°C and 800°C for CGO and YSZ electrolytes, respectively. Relatively stable Long-term performance has been demonstrated for the La0.8Sr0.2FeO3 cathode on YSZ. After current conditioning of the cathode, polarization curves for La0.8Sr0.2FeO3 operating at 800°C achieved values similar to those for the currently used cathode, La0.8Sr0.2MnO3, operating at 1000°C.