Microwave synthesized nanostructured TiO 2 -activated carbon composite electrodes for supercapacitor

Abstract

Electrochemical properties of a supercapacitor based on nanocomposite electrodes of activated carbon with TiO <inf>2</inf> nano particles synthesized by a microwave method have been determined. The TiO <inf>2</inf> /activated carbon nanocomposite electrode with a composition of 1:3 showed a specific capacitance 92 Fg -1 . The specific capacitance of the electrode decreased with increase in titanium dioxide content. The p/p symmetrical supercapacitor fabricated with TiO <inf>2</inf> /activated carbon composite electrodes showed a specific capacitance of 122 Fg -1 . The electrochemical behavior of the neat TiO <inf>2</inf> nanoparticles has also been studied for comparison purpose. The galvanostatic charge-discharge test of the fabricated supercapacitor showed that the device has good coulombic efficiency and cycle life. The specific capacitance of the supercapacitor was stable up to 5000 cycles at current densities of 2, 4, 6 and 7 mA cm -2 . © 2012 Elsevier B.V.