Copper Oxides Nanowires Arrays Composited Electrode And Their Capacitive Performance

Copper oxides,including CuO and Cu₂ O,have been widely used in Li-ion battery,water-splitting and catalysis.In this paper,the copper oxides nanowires arrays are composited with cobalt and nickel oxides to improve the capacitance through a facile chemical bath deposition progress.Meanwhile,assembling with activated carbon negative electrode,asymmetric supercapacitors show robust performance.The main results are summarized as follows:?1?The copper oxides nanowires arrays are directly grown on the surface of Cu foil through anodizing and calcination.At 1 mA cm^-2,the areal capacitance of substrate can reach 96 mF cm^-2.Through chemical bath deposition and calcination in argon,the CoO nanoplates are deposited on substrate.Under the condition of 5 mmol L-1,the as-obtained samples have the best capacitance,approaching 280 mF cm^-2.?2?The CuO/Cu₂O@NiCo₂O₄ is synthesized by chemical bath deposition and calcination in argon.At 0.5 mA cm^-2,the areal capacitance of electrode is 435 mF cm^-2.After 10000 cycles at 5 mA cm^-2,the capacitance retains 93.6% of initial capacitance.?3?The NiCo₂O₄@CuO/Cu₂ O is immersed into glucose solution of 15 g L-1 and calcinated in argon subsequently.The as-prepared CuO/Cu₂O@NiCo₂O₄-C electrode manifests 655 mF cm^-2 at 0.5 mA cm^-2 and 97% of initial capacitance after 10000 cycles.?4?The CuO/Cu₂O@Ni Co₂O₄-C positive electrode and activated carbon negative electrode are assembled.The cell voltage of asymmetric supercapapcitor is 1.5 V.The maximum energy density and power density are 36.9 ?Wh cm^-2(at 2.3 mW cm^-2)and 15 mW cm^-2(at 26.25?Wh cm^-2).After 4000 cycles,the asymmetric supercapacitor retains 91% of its initial capacitance.