Wh Kg -1 in 1M TEABF4/AN was obtained at the working voltage of 2.5 V. AC-800 and AC-900 were found to be 301, 336, and 313 F g -1 at 1 A g -1 in 2M KOH aqueous solution, respectively. Among the three different samples, it was found that the AC-800 has got the larger SBET and pore volume of 3102 m 2 g -1 and 1.41 cm capacitance of 419 F g -1 at 1 A g -1 in 6 M KOH solution as it got the maximum SBET of 2968 m 2 g -1 as well as the higher content of oxygen ).