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Huỳnh Lê Thanh Nguyên, Nguyễn Thị Như Quỳnh, Hoàng Minh Nhật, Nguyễn Hoàng Anh(1), Nguyễn Thái Hoàng, Lê Viết Hải(2), Pham Thị Năm, Nguyễn Thị Thơm, Nguyễn Thị Thu Trang, Trần Đại Lâm, Lê Trọng Lư

NGHIÊN CỨU VAI TRÒ CỦA ỐNG THAN NANO VÀ GRAPHENE ĐẾN TÍNH CHẤT ĐIỆN HÓA CỦA VẬT LIỆU COMPOSITE TiO2 ỨNG DỤNG CHO SIÊU TỤ ĐIỆN HOÁ

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

Tạp chí Phân tích Hóa, Lý và Sinh học

2023

2

52

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.

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.

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