▎ 摘　　要

Co3O4 nanocrystals grown on graphene nanosheets (GNSs) were synthesized through a facile microwave hydrothermal method. The morphological and crystalline changes of Co3O4 nanocrystals during the microwave hydrothermal treatment are characterized by FE-SEM and XRD. Different morphologies of Co3O4/GNSs are obtained by controlling the microwave hydrothermal temperatures and time. The particle-slice Co3O4/GNSs exhibits the specific capacitance of 736Fg(-1) at a current density of 9Ag(-1) and 659Fg(-1) at a high current density of 32Ag(-1) (similar to 97% capacitance retention at 4.5Ag(-1) and similar to 89% capacitance retention at 9Ag(-1)). Therefore, the anode material with high rate capability and excellent cycle stability could be promising for high-performance supercapacitor. Different morphologies of Co3O4 nanocrystals grown on commercial graphene nanosheets have been successfully prepared, particle-slice Co3O4/GNSs shows high specific capacitance with excellent rate capability and long cycle stability. [GRAPHICS] HighlightsGraphene nanosheets anchored with different morphologies of Co3O4 nanocrystals were explored for supercapacitor application.Microwave hydrothermal method was used to control the morphology of Co3O4.Particle-slice Co3O4/GNSs owns high rate capability and good cycle stability because of its special structure.