Hierarchical Ni0.54Co0.46O2 nanowire and nanosheet arrays grown on carbon fiber cloth for high-performance supercapacitors

Abstract

Abstract Hierarchical Ni 0.54 Co 0.46 O 2 architectures composed by nanowires or nanosheets were successfully grown on bio-mass carbon fiber cloth (CFC) by hydrothermal method. The morphology of Ni 0.54 Co 0.46 O 2 can be effectively controlled by using different precipitators. The structural effects of the two kinds of morphologies were researched. the results suggest that the Ni 0.54 Co 0.46 O 2 nanosheet arrays grown on CFC (NCO-NSs/CFC) shows a higher Faradaic areal capacity of 438 μAh cm −2 (238.1 mAh g −1 ) at a current density of 1 mA cm −2 and still about 90.3% initial capacity retention even at the high current density of 50 mA cm −2 . Moreover, an all-solid-state flexible symmetric supercapacitor device has been successfully assembled. The optimized device delivers superior electrochemical performance with an outstanding energy density of 92.4 Wh kg −1 at a power density of 207.2 W kg −1 . Such hierarchical nanostructure composed by well-aligned uniform Ni 0.54 Co 0.46 O 2 nanosheet arrays grown on bio-mass carbon fiber cloth might hold great promise as battery-type electrode material for high-performance supercapacitor.