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Among (La 0.8 Sr 0.2 ) 0.95 MnO 3-δ (LSM) based cathodes LSM-(Er 0.2 Bi 0.8 ) 2 O 3 (LSM-ESB) composite shows promising performance and is one of potential cathodes for low temperature solid oxide fuel cells (LT-SOFCs). The high conductivity ESB exhibits oxygen-ordering at temperatures ≤600°C, resulting in an ordered super-lattice with low oxygen mobility. Here the electrochemical performance of LSM-ESB was investigated using electrochemical impedance spectroscopy (EIS). The cathode area specific resistance (ASR) of LSM-ESB is a function of LSM/ESB ratio, suggesting that the importance of co-existence of electronic and ionic conducting phases. Under cathodic polarization, ASR of cell decreases as a function of bias while ASR remains almost the same under anodic polarization. Also, the high temperature reactivity between LSM and ESB solid phases is studied. Our finding shows that A site deficiency of LSM ABO 3 perovskite structure is important to prevent the formation of strontium bismuth oxide.

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