Wh Kg -1 in 1 M Na2SO4 at the operating voltage of 1.8 V in two-electrode system. This is because of the fact that WW-KOH 9 got the maximum oxygen content of 11.27 at% along with boosted SBET of 2793 m 2 g -1 . From this study, it was found that the oxygen content, specific surface area and specific capacitance increases with rise in the quantity of KOH during activation. Hence it was proposed that wettability of the electrode as well as the overall capacitive performance were boosted to the greater extent due to the pseudocapacitive reaction of oxygen functional groups with ions of the electrolyte as a result of higher oxygen content.