Di(1-aminopyrene)quinone (DAQ) as a quinone-containing conducting additive was synthesized from a solution reaction of 1-aminopyrene and hydroquinone. To utilize the conductive property of DAQ and its compatibility with activated carbon, a composite electrode for a supercapacitor was also prepared by blending activated carbon and DAQ (3:1 w/w), and its supercapacitive properties were characterized based on the cyclic voltammetry and galvanostatic charge-discharge. As a result, a composite electrode adopting DAQ exhibits superior electrochemical properties such as a higher specific capacitance of up to 160 F g^-1 at 100 mV s^-1, an excellent high-rate capability of up to 1000 mV s^-1, and a higher cycling stability with a capacitance retention ratio of 82% for the 1,000th cycle.