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

Abstract

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.