▎ 摘　　要

The highly uniform and single crystalline Co3O4 nanocubes were synthesized and strongly anchored on the surface of graphene nanosheets via a one-step hydrothermal strategy. Owing to the negatively charged surface, graphene oxide can preferably adsorb Co2+ in the initial solution, subsequently inducing the in-situ nucleation and growth of the Co3O4 nanocubes at the elevated hydrothermal temperature. During this process, the graphene oxide is reduced to graphene, thus the fabrication of the Co3O4/G composite is finished. Compared with the Co3O4 irregular particles, the Co3O4/G composite shows enhanced electrocatalytic performance for oxygen evolution, resulting from more active sites and higher charge-transfer efficiency. (C) 2016 Elsevier B.V. All rights reserved.