Activated carbon derived from rice husk by NaOH activation and its application in supercapacitor

Abstract

AbstractFour activated carbon (AC) samples prepared from rice husk under different activation temperatures have been characterized by N2 adsorption–desorption isotherms, thermogravimetric analysis (TGA–DTA), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The specific surface area of AC sample reached 2681m2g−1 under activation temperature of 800°C. The AC samples were then tested as electrode material; the specific capacitance of the as-prepared activated carbon electrode was found to be 172.3Fg−1 using cyclic voltammetry at a scan rate of 5mVs−1 and 198.4Fg−1 at current density 1000mAg−1 in the charge/discharge mode