Hierarchical CuCo2O4@nickel-cobalt hydroxides core/shell nanoarchitectures for high-performance hybrid supercapacitors

Ni0.5Co0.5(OH)(2) nanosheets coated CuCo2O4 nanoneedles arrays were successfully designed and synthesized on carbon fabric. The core/shell nanoarchitectures directly served as the binder-free electrode with a superior capacity of 295.6 mAh g(-1) at 1 A g(-1), which still maintained 220 mAh g(-1) even at the high current density of 40 A g(-1), manifesting their enormous potential in hybrid supercapacitor devices. The as-assembled CuCo2O4@Ni0.5Co0.5(OH)(2)//AC hybrid supercapacitor device exhibited favorable properties with the specific capacitance as high as 90 F g(-1) at 1 A g(-1) and the high energy density of 32 Wh kg(-1) at the power density of 800Wkg(-1). Furthermore, the as-assembled device also delivered excellent cycling performance (retaining 91.9% of the initial capacitance after 12,000 cycles at 8 A g(-1)) and robust mechanical stability and flexibility, implying the huge potential of present hierarchical electrodes in energy storage devices. (C) 2017 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.