Single-step hydrothermal synthesis of wrinkled graphene wrapped TiO2 nanotubes for photocatalytic hydrogen production and supercapacitor applications

Abstract Herein, we discuss the synthesis of reduced graphene oxide and TiO 2 (rGO-TiO 2 ) nanocomposites with varying ratios of rGO to TiO 2 by hydrothermal method. Photocatalytic ability of the nanocomposites was assessed for H 2 production under natural sunlight. At 5 wt% GO loading, the rGO-TiO 2 exhibited 24,880 μmol/g/h H 2 , 12.9 times to commercial P25-TiO 2 (1920 μmol/g/h). The symmetric supercapacitor device fabricated using rGO-TiO 2 demonstrated 160 F/g specific capacitance with 99% retention. The efficient charge carrier separation and transportation between TiO 2 nanotubes and rGO resulted high photocatalytic activity. The synergistic double layer pseudo capacitor behavior of rGO-TiO 2 is the reason for improved specific capacitance.