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

Four activated carbon (AC) samples prepared from rice husk under different activation temperatures have been characterized by N-2 adsorption-desorption isotherms, thermogravimetric analysis (TGA DTA), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The specilic surface area of AC sample reached 2681 m(2) g(-1) under activation temperature of 800 degrees C. The AC samples were then tested as electrode material; the specific capacitance of the as-prepared activated carbon electrode was found to be 172.3 F g(-1) using cyclic voltammetry at a scan rate of 5 mV s(-1) and 198.4 F g(-1) at current density 1000 mA g(-1) in the charge/discharge mode. (c) 2014 Chinese Materials Research Society. Production and hosting by Elsevier B.V. All rights reserved.