Hydrothermal Synthesis of TiO 2 Nanowires‐Reduced Graphene Oxide Nanocomposite to Enhance Electrochemical Performance in Supercapacitor

In this paper, uniform TiO 2 nanowires (TiO 2 NWs) on reduced graphene oxide (RGO) nanosheets were successfully synthesized by a simple and low‐cost hydrothermal method. The high capacitance (202.5 F⋅g −1 at 1 A⋅g −1 ) and excellent cyclic stability (81.9% capacity retention after 5000 cycles) were achieved for TiO 2 NWs‐RGO nanocomposite as supercapacitor electrode. The excellent electrochemical performance is due to the synergistic effect of one‐dimensional TiO 2 NWs with chemical stability and RGO with excellent conductivity. Moreover, TiO 2 NWs can effectively avoid agglomeration, shorten the ion diffusion length and greatly facilitate the charge transfer both at the contact interfaces and within the electrode materials during the electrochemical process. A symmetric supercapacitor was successfully assembled using the TiO 2 NWs‐RGO nanocomposite. It possesses a remarkable performance with a specific capacitance of 45.7 F⋅g −1 , an energy density of 9.08 Wh⋅kg −1 at a power density of 598 W⋅kg −1 .