Hierarchical core-shelled CoMo layered double hydroxide@CuCo₂S₄ 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, CuCo₂S₄ nanowire arrays (NWAs) are vertically grown on nickel foam (NF) utilizing hydrothermal synthesis. Then, CoMo-LDH nanosheets are uniformly deposited on the CuCo₂S₄ NWAs by electrodeposition to obtain the CoMo-LDH@CuCo₂S₄ NWAs/NF electrode. Due to the superior conductivity of CuCo₂S₄ (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⁻¹ at 1 A g⁻¹, and after 10, 000 cycles, its capacity retention ratio is 92.2 % at 10 A g⁻¹. At a power density of 983.9 W kg⁻¹, the CoMo-LDH@CuCo₂S₄ NWAs/NF//AC/NF device has an energy density of 52.2 Wh kg⁻¹. This indicates that CoMo-LDH@CuCo₂S₄/NF has a great potential for supercapacitors.