A PbO2/AC asymmetric electrochemical capacitor (AEC) with energy density as high as 49.4 Wh kg(-1), power density of 433.2 W kg(-1) and specific capacitance of 135.2 F g(-1) was fabricated with PbO2 electrodeposited on three-dimensional porous titanium (3D-Ti/PbO2) and activated carbon. The high electrochemical active surface of 3D-Ti/PbO2 resulted in high specific capacity making it suitable for use as positive electrode in PbO2/AC AEC. The fabricated AEC demonstrated good power performance with an energy density conservation of 30 Wh kg(-1) at power density of 2078 W kg(-1). The fabricated AEC also showed excellent cycling stability with capacitance retention of 99.2% after 1000 cycles. Copyright (c) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.