Fuming Zhang et al. reported the Metaplexis Japonica (MJ) shell derived activated porous carbon as a result of activation of caustic potash with pre-carbonized form of MJ in the mass proportion of 1:1, 3:1 and 5:1 at 400 °C for 1.5 h and 800 °C for 2 h via the flow of Ar followed by washing with 1 M HCl . Out of different samples, the sample MJ-5 submitted the maximum gravimetric capacitance of 423 F g -1 at 5 mA cm -2 in 6 M KOH aqueous solution because of the extraordinary SBET value of 3635 m 2 g -1 . It was found that with increase of content of KOH, the carbon content enhances while the content of oxygen reduces.