ENHANCED CAPACITIVE CHARACTERISTICS OF TIO2 NANOFLAKES BASED ELECTRODE MATERIAL FOR SUPERCAPACITOR

Abstract

This paper presents an experimental investigation of the enhanced capacitive characteristics of newly fabricated TiO2 based electrode material for supercapacitor. TiO2 particles have been synthesized by means of sol-gel method. The size, morphology and structural properties of TiO2 particles have been studied with the help of high resolution transmission electron microscope (HRTEM), field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD), respectively. The electrochemical properties of the TiO2 based electrode were determined by using cyclic voltammetry (CV) and galvanostatic charge-discharge tests. The results obtained from CV test show that maximum specific capacitance for TiO2 based electrodes has been evaluated as 164 F g-1 at the scan rate of 5 mV s-1 in 1M Na2SO4 electrolyte. The cycle stability of the TiO2 based electrodes has been probed with the help of the cyclic voltammetry and galvanostatic charge-discharge measurements. The cycle stability test reveals that after 2000 charge-discharge cycles, TiO2 based electrode has lost only 14% capacitance value of that of the initial value. Thus, the as synthesized TiO2 nanoflakes could be suggested to be the potential candidate as the electrode material for supercapacitor.