Solid oxide fuel cells (SOFC) directly convert fuel into electricity hence it received a great deal of interest as alternative high performance and environmentally friendly power generation systems. The high operating temperature limits technological development of solid oxide fuel cell. Intermediate temperature solid oxide fuel cells (IT-SOFCs) overcome these limitations because of its intermediate operating temperature. Reducing the operating temperature, however, decreases the cathode kinetics resulting in the large interfacial polarization resistances. Perovskite and related oxides are extensively explored for applications in IT-SOFC electrodes. Recently, K₂NiF₄-type structure materials are investigated for cathode materials as they exhibit oxygen over-stoichiometry.

Keywords: SOFC, IT-SOFC, Cathode, Perovskite Materials, MIEC, K₂NiF₄.