The progress toward a commercial solid oxide fuel cell ͑SOFC͒ 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°C͒ yttria-stabilized zirconia ͑YSZ͒ electrolytes and low-temperature ͑500-650°C͒ gadolinia-doped ceria ͑CGO͒ electrolytes. The present study has identified La͑Sr͒FeO 3 and possibly Pr͑Sr͒FeO 3 as potential cathode materials for YSZ. A La-deficient La͑Sr͒FeO 3 cathode has achieved an area-specific resistance of 0.1 ⍀ cm 2 at 800°C, with stable long-term performance. On CGO, Pr͑Sr͒CoO 3 , Gd͑Sr͒CoO 3 , and Sr͑Co/Fe) 1.5 O 3.25 have all achieved an area-specific resistance close to 0.1 ⍀ cm 2 at 650°C, with relatively stable long-term performance, but further reduction in temperature to 600°C is necessary for efficient CGO operation.

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