In general, hydrophilic nature was incorporated in the carbon materials by two different strategies such as plasma treatment and chemical activation . It was reported that the enhanced wettability was observed in the nanocarbon was attributed to the increased capacitance in KOH solution compared to acidic and neutral electrolyte . It is also illustrated that the capacitance of oxygen plasma treated bio char is higher than that obtained with chemical activation suggesting that the augmented wettability of the surface permits effective interaction as well as fast movement of ions from the electrolyte to the electrode that diminishes the charge transfer resistance leading to the enriched EDLC behaviour . On the other hand, these oxygen functionalities raise the capacitance by imparting pseudocapacitance via redox processes. The mathematical relation between the oxygen and the capacitance is represented with the below expression .