▎ 摘　　要

TiO2 nanobelts (NBs) and nanoparticles (NPs) have been coupled with the chemically reduced graphene oxide (rGO) to form nanocomposites which are used as supercapacitor electrodes. The specific capacitance of rGO-TiO2 composites is higher than that of monolithic rGO, TiO2 NPs or NBs. The optimal electrochemical performance is achieved with the rGO-TiO2 composites at a rGO : TiO2 mass ratio of 7 : 3. In addition, the rGO-TiO2 NBs exhibit better performance than the rGO-TiO2 NPs in terms of specific capacitance, rate capability, energy density and power density. The specific capacitances of rGO-TiO2 NBs and rGO-TiO2 NPs with a mass ratio of 7 : 3 are 225 F g(-1) and 62.8 F g(-1) at a discharge current density of 0.125 A g(-1), respectively. The better performance of the rGO-TiO2 NBs is attributed to the nanobelt's unique shape, better charge transport property and larger area of contact with the rGO nanosheet.