▎ 摘　　要

Novel nanoflake-like and nanobelt-like alpha-MoO3/graphene nanocomposites were synthesized by a facile hydrothermal method through tailoring the content of Mo source. The formation mechanisms of alpha-MoO3/graphene nanocomposites with different morphologies has been investigated. As a model, the alpha-MoO3/graphene nanocomposites were studied for electrochemical energy storage supercapacitor devices. The results showed that alpha-MoO3 nanoflakes/graphene displayed better supercapacitive performances than that of alpha-MoO3 nanobelts/graphene, arising from the structural superiority and optimum compositions. The best composite exhibited a high specific capacitance (up to 360 F g(-1)) at a current density of 0.2 A g(-1), good rate capability, and a nearly 100% long-term cycle stability. This study provided a facile and optimal experimental design to prepare alpha-MoO3/graphene composite materials which act as promising electrode materials for high-performance supercapacitors.