Furthermore, MJ-5 derived symmetric cell displayed the enhanced energy density of 76 Wh Kg -1 in EMIMBF4 electrolyte at the operating voltage of 3.5 V along with 84% of capacitance retained after 5000 cycles. This study apparently suggested that eventhough the content of oxygen is less, the electrochemical performance of carbon materials is enhanced to the greater extent due to increment in the porous network as well as specific surface area owing to the increment in content of KOH during activation. Ganesh dhakal et al. fabricated the porous carbon via the activation of dried lotus calyx with caustic potash in the mass ratio of 1:2 at 750