Thereby, different perovskite-type oxides, such as Ba1–xSrxCo1–yFeyO3−δ (BSCF),10−12 La0.6Ba0.4CoO3−δ (LBC),13 La0.6Sr0.4CoO3−δ (LSC),13 La1–xSrxCo1–yFeyO3−δ (LSCF),8,14 La0.6Sr0.4FeO3−δ (LSF),15 Sm1–xSrxCoO3−δ (SSC),8 SrFeO3−δ (SFO),16 and SrTi1–yFeyO3−δ (STF),16 have been investigated as promising cathode candidates for SOFCs.