▎ 摘　　要

Integrating carbonaceous materials with metal oxides to construct a robust 3D network is a powerful yet challenging option to improve the performance of Li-O-2 batteries. Herein, a facile bottom-up method was developed to prepare N-doped graphene strengthened by cross-linked uniform cobalt oxide nanoparticles. This distinctive structure provided essential properties for oxygen cathodes, including an intrinsically high catalytic activity, inherently open active sites, large accessible surface areas, and a continuous porous nature for the accommodation of discharge products. Consequently, it was observed that this interesting nanostructure manifested a satisfying oxidation activity towards Li2CO3 and LiOH within the stability window of the electrolyte, which outperformed the commercial Ru/C (5%) catalyst. Also, cell measurements revealed that a superior capacity and comparable cycling performance were achieved with the discussed complex electrode in pure O-2, N-2, CO2 and even ambient air. As such, the present study rationalized the great potential of the fabricated N-enriched graphene-dispersed catalyst in the transition from Li-O-2 to Li-air batteries.