The performance of solid oxide fuel cells (SOFCs) is considerably influenced by the microstructure and chemical composition of cathode materials. Porous La 0.85 Sr 0.15 FeO 3 – Ce 0.9 Gd 0.1 O 2 composite electrodes were infiltrated by La 0.6 Sr 0.4 CoO 3 and La 0.6 Sr 0.4 FeO 3 . The effects of infiltration loading, calcination temperature of infiltrated material and co-infiltration of LSC and LSF were investigated using electrochemical impedance measurement, microstructural analysis, and high-temperature X-ray diffraction (HT-XRD). A symmetrical cell two-electrode configuration was used to examine the electrochemical performance of the electrodes. The electrochemical results revealed that the polarization resistance of the cathodes significantly was decreased by infiltration from 2.59 to 0.034 Ω cm 2 measured at 670 °C. The best electrode performance was achieved at a calcination temperature of 770 °C. It was also found that infiltration of LSC improved the stability of the electrodes during 145 h of testing at 620 °C in air at open circuit voltage (OCV).