1. A method of treating carbon as a positive electrode in an asymmetric supercapacitor, comprising: treating the carbon by cyclic voltammetric scan cycles; and treating the carbon by charging-discharging cycles, wherein the carbon has an activation threshold larger than 1400 and the activation threshold (AT) is obtained from the following formula: 
 AT=L a *( A a /A c ), L a is an in-plane correlation length of the carbon, A a is an area of amorphous peak of the carbon analysed by X-ray diffraction in Gaussian distribution graph, and A c is an area of crystalline peak of the carbon analysed by X-ray diffraction in Gaussian distribution graph.