LaCoO3 is again a perovskite like LSM and possesses better electronic conductivity than LSM . The main problem, however, has been the stability of this material which has been tackled by doping the system with Sr which replaces Ln in the structure to give the strontium-substituted cobaltite perovskites (LSC: La1-xSrxCoO3-) . LSC is a mixed conductor material and has shown good ionic conductivity and ORR catalytic properties . The major issue with LSC, however, is its high TEC, of the order of 20 × 10 -6 K -1 . When this considerably high TEC is compared to the commonly used electrolytes like YSZ and CGO (12 × 10 -6 K -1 ), compatibility issues with other cell components come to the fore and render the material problematic .