Synthesis, electrical conductivity and electrochemical properties of SrFe_(1-x)Sb_xO_(3-δ) as cathode materials for IT-SOFCs

摘要

Fe-based perovskite oxides SrFe_(1-x)Sb_xO_(3-δ) (SFS, x = 0.05-0.15) have been prepared by a solid-state reaction and studied as novel cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). As SOFC cathodes, the highest electrical conductivity of 100 S cm~(-1) at 425°C in air was obtained for the x = 0.05 sample. The area-specific resistances of the SFS (x = 0.05) cathode on the LSGM electrolyte where at 700°C is 0.17Ω cm~2. All these results demonstrates that Sb-substituted SFS perovskites materials are promising cheaper alternative cathodes for an IT-SOFC.