Abstract: Activated porous carbon (aHPC) with large surface area is fabricated by the KOH activation method,and the porous aHPC supported polyaniline nanocomposite (aHPC@PANI) is fabricated by the in-situ chemical oxidation method.The organic asymmetric supercapacitor is further designed using aHPC as negative electrode and aHPC@PANI as positive electrode in the Et₄NBF₄-AN electrolyte.The electrochemical tests show that aHPC@PANI and aHPC deliver the specific capacitance of 256.7 F/g(-0.6~0.8 V) and 152.4 F/g(-2~-0.6 V) at the current density of 1 A/g,respectively.The as-synthesized organic asymmetric supercapacitor achieves wide potential window (2.8 V),high energy density (56.2 W·h/kg at the power density of 0.75 kW/kg),and excellent cycling stability (the specific capacitance retention is 92.4% after 5 000 cycles).