STUDY ON THE ROLE OF CNTs AND GRAPHENE TO THE ELECTRICAL PROPERTIES OF COMPOSITE TiO2 APPLICATIONS FOR SUPERCAPACITOR

Abstract

In this study, the composite of TiO2 with carbon nanotubes (CNTs) and graphene (Gr) including TiO2/CNTs,
TiO2/Gr and TiO2/CNTs-Gr was prepared by hydrothermal method from precursor titanium alkoxide, with
the goal of application as electrodes in electrochemical supercapacitors. The results of analysis of
structural, morphological, specific surface area, and chemical composition of the materials were analyzed
by methods of X-ray diffraction (XRD), scanning electron microscope (SEM), N2 adsorption-desorption
isotherm (BET) showed that the composite material of TiO2 formed had anatase phase with polydisperse
in particle size. The electrochemical properties were analyzed by electrochemical impedance (EIS), cyclic
potential scanning (CV) method, showing that the TiO2/CNTs-Gr composite material with the combined
effect of the two conductive carbons enhances the ability to electron conduction capacity in the material
structure thereby improving the capacitance value to 350 F/g (1 mV/s scan rate). Besides, the asymmetric
supercapacitor model of TiO2/CNTs-Gr material with AC activated carbon also achieves high capacitance ~366 F/g (current density 1 A/g) and maintains durability. in 1000 discharge cycles.