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

A nanoarchitectured La₂O₂CO₃–La_0.7Sr_0.3MnO₃ hybrid catalyst is prepared by a facile hydrothermal method. The La₂O₂CO₃ nanorods are well distributed on the regular hexagonal La_0.7Sr_0.3MnO₃ nanosheet. The La₂O₂CO₃–La_0.7Sr_0.3MnO₃ catalyst has better catalytic activity to oxygen reduction reaction than that of La₂O₂CO₃ or La_0.7Sr_0.3MnO₃. The reaction kinetics result shows that La₂O₂CO₃–La_0.7Sr_0.3MnO₃ sample follows a four-electron transferred process during the oxygen reduction reaction. Furthermore, the stability of La₂O₂CO₃–La_0.7Sr_0.3MnO₃ is higher than that of Pt/C. By using La₂O₂CO₃–La_0.7Sr_0.3MnO₃ 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–La_0.7Sr_0.3MnO₃ can be attributed to the strong interaction between the La₂O₂CO₃ material and La_0.7Sr_0.3MnO₃ material.