Electrical and electrochemical properties of SrBiMTiO (M = Fe, Mn, Cr) as potential cathodes for solid oxide fuel cells.

A series of perovskite oxides SrBiMTiO (M = Fe, Mn, Cr) have been synthesized and characterized towards application as cathode materials for solid oxide fuel cells (SOFCs). X-ray diffraction (XRD) patterns reveal that all samples are stabilized in $$ \mathrm{Pm}\ \overline{3}\mathrm{m} $$ space group. Electrical conductivity, AC impedance characteristics, and thermal and chemical stability have been studied in order to assess their possible use as SOFC cathode materials. In comparison with other low electrical conductivity cathodes of SOFC, our results suggest that SrBiMnTiO, which has the highest electrical conductivity (4.02 S cm) and moderate polarization resistance (0.104 Ω cm) at 850 °C, is the most promising candidate among the three perovskite oxides for further study and optimization as a SOFC cathode material. [ABSTRACT FROM AUTHOR]