A Nano-Architectured Metal-Oxide/Perovskite Hybrid Material as Electrocatalyst for the Oxygen Reduction Reaction in Aluminum–Air Batteries

A nanoarchitectured La2O2CO3–La0.7Sr0.3MnO3 hybrid catalyst is prepared by a facile hydrothermal method. The La2O2CO3 nanorods are well distributed on the regular hexagonal La0.7Sr0.3MnO3 nanosheet. The La2O2CO3–La0.7Sr0.3MnO3 catalyst has better catalytic activity to oxygen reduction reaction than that of La2O2CO3 or La0.7Sr0.3MnO3. The reaction kinetics result shows that La2O2CO3–La0.7Sr0.3MnO3 sample follows a four-electron transferred process during the oxygen reduction reaction. Furthermore, the stability of La2O2CO3–La0.7Sr0.3MnO3 is higher than that of Pt/C. By using La2O2CO3–La0.7Sr0.3MnO3 as the cathode catalysts for aluminum–air battery, the power densities can reach 223.8 mW cm–2. The high catalytic performance of the La2O2CO3–La0.7Sr0.3MnO3 can be attributed to the strong interaction between the La2O2CO3 material and La0.7Sr0.3MnO3 material.