Iron-cobalt-based ABO3 perovskite oxides are promising cathode materials for intermediate temperature SOFCs because of their high electronic conductivity and high oxygen catalytic activity based on disorder-free oxygen ion migration mechanism. In this study, different perovskite structure materials, La0.6Sr0.44Co0.2Fe0.8O3 (LSCF), Ba0.5Sr0.5Co0.2Fe.08O3 (BSCF), and Sm0.5Sr0.5Co0.2Fe0.8O3 (SSCF), are studied at 600oC, 700oC and 800oC through an AISI 441 interconnect/cathode/yttria-stabilized zirconia electrolyte half-cell structure. At 600oC, BSCF cathode has the smallest polarization resistance. However, at 700oC and 800oC for 100 hrs respectively, LSCF cathode has the smallest polarization resistance. This indicates that SOFC needs to adapt different cathode materials for different uses. SrCrO4 phase forms on the LSCF and SSCF cathodes near the interconnect, while BaCr2O4 phase forms on the BSCF cathodes near the interconnect. To avoid Cr species interactions with these cathodes, new interconnect coating materials have also been studied.