Effect of heat treatment on structure and electrochemical performance of TiO2/AC electrode material

Abstract:

To explore the effect of different heat treatment temperature on structure and electrochemical performance of electrode material(TiO₂/AC) prepared by sol-gel method, Scanning Electron Microscopy (SEM), thermal gravimetric analysis (TG-DTG), Brunauer-Emmett-Teller gas adsorption method (BET), X-ray diffraction (XRD) and electrochemical workstation are introduced to analyses the micro-structure and electrochemical performance. The results show that the crystal anatase TiO₂ nanoparticles were attached to the surface and pores in the activated carbon by heat treatment. With the increase of temperature, the specific surface area increased first and then decreased. Moreover, the crystal form changed from anatase to rutile and grain size increasing gradually, and the specific capacitance of corresponding electrode increased first and then decreased. When the temperature was 450 ℃, crystal form was anatase ; the grain size, effective specific surface area and electrochemical performance were the best.