Preparation And Electrochemical Properties Of TiO₂NT/C/Mn_xO_y Composites

Super capacitor is a new type of energy storage device having a green, high efficiency, excellent properties, in new energy technologies, electric vehicles and other fields have broad application prospects. In this paper, anodic oxidation/Gas penetration/composite electrochemical deposition prepared TiO₂NT/C and TiO₂NT/C/Mn_xO_y electrode material. The use of XRD, SEM, RAMAN and XPS structure and morphology of the electrode material for analysis. The use of AC impedance, cyclic voltammetry and constant current charge-discharge test study the electrochemical properties of the Na2SO4 solution.Prepared by anodization TiO₂ NTs resistance value of 2×104Ω, poor conductivity, capacitance value 9.17F/m2, electrochemical performance is not very good. Gas penetration method utilizing methanol prepared TiO₂ NT carbon load on the penetration TiO₂NTs/C composites, the effects of infiltration dose and temperature on the penetration of the composite structure and electrochemical properties. Increase the dose infiltration, composites rutile and anatase TiO₂ content increased; nanotubes with penetration of crystal phase transition temperature from anatase to rutile TiO₂, high temperature nanotube structure collapse and fall off. With the increase in the dose of infiltration or penetration of the temperature increase, reducing the relative content after the first composite material of carbon increased after resistance decreases and then increases, then decreases to increase the capacitance value. Thermal diffusion to achieve a carbon load, which greatly reduces the resistance of the nanotubes to improve the electrochemical properties: When infiltration dose of 300 mL, temperature of 450°C maximum capacitance value of 377.6F/g, the resistance value of 9.731Ω. 300 mL of infiltration dose, temperature of 550°C composite charge-discharge 1000 times, no attenuation capacitance value, the charge and discharge stability of the material is very good.In KMnO4 solution, by electrochemical reduction method TiO₂NT/C/Mn_xO_y composites, the effects of the electrochemical reduction of the number of cycles and the scan rate of the composite structure and electrochemical properties. The number of cycles increases with scan rate will be reduced to increase the content TiO₂NT/C manganese elements. XPS analysis showed, Mn mainly in the form MnO₂ and Mn3O4 existence. With the increase of the number of cycles in TiO₂NT/C on the deposited manganese oxide in an amount more than the electrochemical performance increases. Scan rate of 100 m V s, the number of cycles is 300 times the capacitance value of the composite material 648F/g, compared to TiO₂NT/C increases the value of the capacitance 455.5F/g; The scan rate of 20mV/s, when the cycle for 100 times the capacitance value of the composite material 960F/g, compared to TiO₂NT/C increases the value of the capacitance 709.2F/g. Scan rate of 20 mV s, cycle times of 100 times 1000 times composites constant current charge and discharge, the capacitance value of no attenuation, charge and discharge stability of the material is very good. In MnSO4 solution, prepared electrochemical oxidation TiO₂NT/C/Mn_xO_y electrode material, the influence of the number of cycles and the scan rate of the composite structure and electrochemical properties. Loops of 300 times the maximum capacitance value of 106.2F/g, a scan rate of 40mV/s time maximum capacitance value of 98.4F/g. Scan rate of 80mV/s, cycle times of 100 times 1000 times composites constant current charge and discharge, the capacitance value is less attenuation, good charge and discharge stability of the material.