Supercapacitor performances of thermally reduced graphene oxide

In this paper, graphene sheets with different reduction levels have been produced through thermal reduction of graphene oxide in the temperature range of 200-900 degrees C. The effects of interlayer spacing, oxygen content, BET specific surface area and disorder degree on their specific capacitance were explored systematically. The variation of oxygen-containing groups was shown to be a main factor influencing the EDL capacitor performances of the pyrolytic graphene. The highest capacitance of 260.5 F g(-1) at a charge/discharge current density of 0.4 A g(-1) was obtained for the sample thermally reduced at about 200 degrees C. (C) 2011 Elsevier By. All rights reserved.