High mass loading Co3O4/CoS-based composites are constructed on Co foam through a one-pot hydrothermal process. Most importantly, when a Ni foam acting as counterpart support is introduced, components, morphologies and structures of composite on Co substrate significantly change: Micro-sized Co3O4/CoS transforms into hierarchical Co3O4/CoS/Ni(OH)(2) nanocomposite. In addition, the areal loading of Ni counterpart-induced Co3O4/CoS/Ni(OH)(2) nanocomposite reaches 14.72mg cm(-2), and it exhibits excellent electrochemical performances: Its electrode possesses an areal capacitance of 14768 mF cm(-2) at a current density of 10 mA cm(-2) and 95.8% capacitance retention after 10000 cycles, while its asymmetric supercapacitor successfully delivers an energy density of 25.4 Wh kg(-1) at a power density of 81.8 W kg(-1) (or 12.34 Wh kg(-1) at a power density of 1632.9 W kg(-1)) and 90.8% capacitance retention after 20000 cycles at a current density of 200 mA cm(-2). Furthermore, two asymmetric supercapacitor devices connected in series easily drive a red light emitting diode. This work opens a new strategy in preparing ultrahigh areal capacitance supercapacitor electrodes. (c) 2018 Elsevier Ltd. All rights reserved.