Porous perovskite CaMnO₃/rGO hybrid as an efficient electrocatalyst in lithium-oxygen batteries

In this work, we demonstrate a facile route for synthesizing a novel CaMnO₃/reduced graphene oxide (CaMnO₃/rGO) nanohybrid as a cathode catalyst in Li-O₂ batteries. The experimental results show that the CaMnO₃/rGO hybrid exhibits superior electrochemical properties compared to bare CaMnO₃ perovskite oxide. Li-O₂ batteries assembled with a CaMnO₃/rGO cathode catalyst show a remarkable initial discharge capacity of 19 000 mA h g^-1 at a high current density of 1000 mA g^-1. Excellent cycling stability is achieved within 200 cycles at a restricted charge/discharge capacity of 2000 mA h g^-1. The enhanced catalytic performance proposes the hybrid of mesoporous CaMnO₃ perovskite oxide and rGO nanosheets as a potential electrocatalyst for next-generation Li-O₂ batteries.