From the table, it can be seen that the symmetric cells sintered at 800 °C exhibits the best electrochemical performance with the lowest value of ASR of 0.092 Ω cm2 at 750 °C and indicates Figures. 3(a) shows the impedance spectra of the STFP cathode with SDC as the electrolyte at 800 °C for sintering temperatures in air.that the material has the best ORR activity when sintered it at 800 °C.