Electrocatalytic Activity of Co-based Perovskite Oxides for Oxygen Reduction and Evolution Reactions

Cathode of aqueous Li-air batter requires high electrocatalytic activities for oxygen reduction reaction and oxygen evolution reaction. Pure Co-based perovskite oxide (LaCoO3) was prepared by an auto-combustion method at a relatively low calcination temperature (640 degrees C), and La of La1-xSrxCoO3 was partially substituted with Sr to enhance its electrocatalytic activities. La0.7Sr0.3CoO3 showed excellent catalytic activity for the oxygen evolution reaction, and its activity for the oxygen reduction reaction was increased with 5 wt% Pt loading. The electrochemical activity of perovskite was investigated by linear sweep voltammetry and electrochemical impedance spectroscopy.