Nickel-Cobalt hydroxide microspheres are electrodepositioned on the films of NiCo2O4 nanowires grown on the current collector through a facile approach and the hierarchical structures are then investigated as an electrode material for high-performance supercapacitors. Owing to the superior electrical conductivity of NiCo2O4 nanowires, the porous structure of the (Ni-Co)(OH)(2) microspheres and the synergic effect of the multi-components, the electrode can deliver a high areal capacitance of 6 F cm(-2) and a corresponding specific capacitance of 1132 F g(-1) at a current density of 2 mA cm(-2), as well as a good rate capability (61.8% capacitance retention from 2 mA cm(-2) to 50 mA cm(-2)), and excellent cycling stability (90% capacitance retention after 2000 cycles). The results suggest that our research opens up the possibility for the fabrication of high-performance energy-storage devices of binder-free electrodes. (C) 2014 Elsevier B.V. All rights reserved.