Also, the AV-700 got the enhanced SBET of 1890 m 2 g -1 which also contributed the augmented capacitance in aqueous electrolyte. Moreover, the AV-700 derived all-solid-state with PVA-H2SO4 gel electrolyte as well as symmetric supercapacitor in with EMIMBF4 in Swagelok-cell delivered an increased energy density of 22 and 40 Wh Kg -1 , respectively. Interestingly, the fabricated symmetric supercapacitor lighted the red LED about 0.5 h after charging for 20 s and displayed in Fig. . Importantly, the flexible device has got the excellent mechanical stability that was revealed from Fig. that the CV profile remains unaltered even if the device was folded in different bending angles. The same group reported the gravimetric capacitance of corn cob derived activated carbon was found to be 390 F g -1 at 0. electrolyte which is higher than that formed by natural cooling (AC-2: 65.26 F g -1 ). Moreover, the SBET of AC-1 found to be 1176.34 m 2 g -1 which is lower than AC-2 (578.2 m 2 g -1 ). It has been suggested that hydroxyl groups and carboxylic acid groups were reduced during natural cooling while the chances of reduction of same groups are negligible during rapid cooling.