| 초록 |
We report the synthesis of nitrogen- and sulfur-doped three-dimensional (3D) graphene architectures further treated by steam activation to increase the surface area. Tetraethylammonium tetrafluoroborate (TEABF4) in propylene carbonate as an organic electrolyte is used to enlarge the voltage range of a supercapacitor (SC) for high energy density. The 3D nitrogen- and sulfur-doped, steam activated, reduced graphene oxides (N-SRGO and S-SRGO) contained 7.84% and 6.93% of N and S heteroatoms. As shown in the galvanic charge/discharge curves, a range of 0-2.5 V in the 3D N-SRGO architectures showed the highest capacitance of 23.1 F g-1, delivering maximum energy and power densities of up to 20 Wh kg-1 and 6190 W kg-1. |
