One-step hydrothermal synthesis of TiO2 nanowires-reduced graphene oxide nanocomposite for supercapacitor
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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.
KeywordsTiO2 nanowires Reduced graphene oxide Supercapacitor One-step hydrothermal synthesis
This work is supported by the Natural Science Foundation of Heilongjiang Province (LC2015020), Technology Foundation for Selected Overseas Chinese Scholar, Ministry of Personnel of China (2015192), the Innovative Talent Fund of Harbin city (2016RAQXJ185), and Science Funds for the Young Innovative Talents of HUST (201604).
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