Hierarchical core-shelled CoMo layered double hydroxide@CuCoS nanowire arrays/nickel foam for advanced hybrid supercapacitors.

The development of core-shelled heterostructures with the unique morphology can improve the electrochemical properties of hybrid supercapacitors (HSC). Here, CuCoS nanowire arrays (NWAs) are vertically grown on nickel foam (NF) utilizing hydrothermal synthesis. Then, CoMo-LDH nanosheets are uniformly deposited on the CuCoS NWAs by electrodeposition to obtain the CoMo-LDH@CuCoS NWAs/NF electrode. Due to the superior conductivity of CuCoS (core) and good redox activity of CoMo-LDH (shell), the electrode shows excellent electrochemical properties. The electrode's specific capacity is 1271.4 C g at 1 A g, and after 10, 000 cycles, its capacity retention ratio is 92.2 % at 10 A g. At a power density of 983.9 W kg, the CoMo-LDH@CuCoS NWAs/NF//AC/NF device has an energy density of 52.2 Wh kg. This indicates that CoMo-LDH@CuCoS/NF has a great potential for supercapacitors.