Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1288443 | Journal of Power Sources | 2012 | 5 Pages |
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 °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 °C.
► Graphene with different reduction levels is produced through thermal reduction of GO. ► Oxygen content increases and interlayer spacing of pyrolysis GO decreases with temperature. ► Raising reduction temperature results in a lower ID/IG ratio and red-shift of G peak in Raman spectra. ► GO prepared at 200 °C delivers the highest specific capacitance of 260.5 F g−1. ► Oxygen content is shown to be a main factor influencing the EDL capacitor of pyrolysis graphene.