Hydrothermal Synthesis of TiO₂ Nanowires‐Reduced Graphene Oxide Nanocomposite to Enhance Electrochemical Performance in Supercapacitor

Abstract

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 À 1 at 1 A⋅g À 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 À 1 , an energy density of 9.08 Wh⋅kg À 1 at a power density of 598 W⋅kg À 1 .[a] Prof.

Preparation of Graphene Oxide/La2Ti2O7 Composites with Enhanced Electrochemical Performances for Supercapacitors

“…Bokhari et al 28 synthesized a hybrid composite of reduced graphene oxide (rGO)/TiO 2 with 334 F g −1 at 0.1 A g −1 . Yue et al 29 reported a hydrothermal method to develop TiO 2 nanowire/rGO nanocomposites and a high capacitance of 202.5 F•g −1 at 1 A•g −1 was obtained. Cheng et al 30 synthesized amorphous Co 2 SiO 4 nanobelts by a template method.…”

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“…Thus, by annealing the H 2 TiO 3 NWs at 450 °C in air for 2 h, they were converted into TiO 2 NWs. Studies have reported the growth mechanism of TiO 2 NWs in the following manner. − Curving and wrapping nanosheets (NSTs) to NWs. For the curving of NSTs, Zhang et al suggested that an asymmetrical chemical surrounding is induced by the imbalance of H + or Na + ion concentration on the various titanate NST sites.…”

Construction of Functionalized Carbon Nanofiber–g-C3N4 and TiO2 Spheres as a Nanostructured Hybrid Electrode for High-Performance Supercapacitors

“…In the meanwhile, the electrolyte can be balancing and transferring charges between the plates. This type of supercapacitor is used in many areas, such as transportation, electronic devices, and satellites, owing to their high stability, fast charge and discharge proficiency, and high power density. − …”