Comparison of oxygen exchange kinetics of the IT-SOFC cathode materials La0.5Sr0.5CoO3 − δ and La0.6Sr0.4CoO3 − δ

► Electrochemical characterization of perovskite cobaltites LSC55 and LSC64. ► Investigation between 525°C and 725°C and at 0.1, 0.01 and 0.001 bar pO2. ► Electronic conductivities of LSC64 are higher than those of LSC55. ► Oxygen exchange kinetics and transport properties of LSC55 superior to LSC64.