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

• DOI: 10.1016/j.scib.2017.08.014
• Publication Date: 2017-08-16T17:16:41Z
• Authors: Chenggang Wang; Kai Guo; Weidong He; Xiaolong Deng; Peiyu Hou; Fuwei Zhuge; Xijin Xu; Tianyou Zhai
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy; 01 natural sciences; 0104 chemical sciences

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 295.6mAhg-1 at 1Ag-1, which still maintained 220mAhg-1 even at the high current density of 40Ag-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 90Fg-1 at 1Ag-1 and the high energy density of 32Whkg-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 8Ag-1) and robust mechanical stability and flexibility, implying the huge potential of present hierarchical electrodes in energy storage devices.