Reduced Graphene Oxide/black (001) TiO₂ Composites for Supercapacitor Electrodes

Oxided graphite with higher oxidation was designed according to the well-established Hummers’ method, and then uniform graphene oxide obtained by ultrasonic method. The single 001black titanium dioxide、graphene and graphene/001black titanium dioxide composites are prepared from hydrothermal reaction in the temperature of 200 ℃. The materials are characterized via XRD、SEM to analyze the morphology and structure. The electronic properties of supercapacitors are tested when the 001black titanium dioxide composites、graphene and the single 001black titanium dioxide are used for eletrode materials. The study found that electronic properities of composites are superior to the single materials. The test results reflect that when the composites with the ratio of 7:3, supercapacitor shows the better performance, the specific capacitance is 60 F/g at current density of 0.125 A/g and the electrochemical impedance spectroscopy test shows that the internal resistance of this composites is 0.3 Ω.