Supercapacitor composite electrode containing predominantly (81 wt.%) poly(3,4-ethylene-dioxythiophene):polystyrenesulfonate (PEDOT-PSS) conducting polymer (CP) and graphite oxide (GO; 16 wt.%) and carbon nanotube (CNT; 3 wt.%) has been prepared by a solution casting method. The stacking between these carbon additives having very different dimensionality provides a unique skeletal structure that allows for enlarged polymer/electrolyte interface for high-capacitance and for enhanced electronic and ionic conductivities needed for high-power performance. The resulting ternary electrode exhibits nearly ten-fold increase in energy and power performance as compared with pure CP electrode. It possesses a specific capacitance of 365 F g(-1)-electrode over an operating potential window of 2.0 V, and exhibits a specific energy greater than 100 Wh kg(-1)-electrode at the power of nearly 200 kW kg(-1)-electrode with good cycle stability. Given the processing simplicity and outstanding power performance, the present PEDOT-PSSCP-C composite active material is considered possessing great potential for large-scale supercapacitor applications. (C) 2013 Elsevier B.V. All rights reserved.