One-step hydrothermal synthesis of TiO₂ nanowires-reduced graphene oxide nanocomposite for supercapacitor

Graphene oxide (GO) was prepared by a modified Hummers method. TiO₂ nanoparticles (TiO₂ NPs) and NaOH were added into the GO suspension to prepare TiO₂ nanowires-reduced GO (TiO₂ NWs-rGO) nanocomposite by one-step hydrothermal synthesis. Effects of the initial mass ratio of TiO₂ NPs and GO on the morphologies and electrochemical properties of the nanocomposite were investigated in detail. The results show that TiO₂ NWs with the length of ~ 10 μm and the diameter of ~ 50 nm are homogeneously distributed on the graphene nanosheets when the initial mass ratio of TiO₂ NPs and GO is 1:4. Its specific capacitance of the TiO₂ NWs-rGO nanocomposite can reach 572 F·g⁻¹ at 1 A·g⁻¹ in 6 M KOH. Moreover, the nanocomposite exhibits a long-term cycle stability, ~ 84% specific capacitance after 5000 cycles at 10 A·g⁻¹. It suggests that it has potential as an electrode material for high-performance electrochemical supercapacitors.