Preparation and electrochemical performance of CNT electrode with deposited titanium dioxide for electrochemical capacitor

Abstract

To reduce polarization of electrochemical capacitor based on carbon nanotube, titanium oxide nanoparticles were deposited by ultrasound. The pore distribution of TiO2/CNT nanoparticle exhibited surface area of 341 m2g-1 when TiO2 content was 4 wt %, which was better than that of pristine CNT with surface area of 188 m2g -1. The analyses indicated that titanium oxide (particle diameter < 20 nm) was deposited on the CNT surface. The electrochemical performance was evaluated by using cyclic voltammetry (CV), impedance measurement, and constant-current charge/discharge cycling techniques. The TiO2/CNT composite electrode showed relatively better electrochemical behaviors than CNT electrode by increasing the specific capacitance from 22 Fg-1 to 37 Fg-1 in 1 M H2SO4 solution. A symmetric cell assembled with the composite electrodes showed the specific capacitance value of 11 F-1 at a current loading of 0.5 mAcm-2 during initial cycling.