ZnS/NiCo2S4 arrays on nickel foam as an energy storage for supercapacitor.

Ternary mixed metal sulfide is a potential pseudocapacitive material. In this work, ZnS nanowire and NiCo₂S₄ nanosheet were grown on nickel foam through hydrothermal method. As compared with NiCo₂S₄/NF and ZnS/NF, ZnS/NiCo₂S₄/NF has a significant supercapacitance. The surface capacitance is as high as 2604 mF cm⁻² at 1 mA cm⁻², and still keep 1020 mF cm⁻² with electric current density of 10 mA cm⁻². The ZnS/NiCo₂S₄/NF nanostructures have large capacitance retention rate of 90% after 6000 laps in condition of 8 mA cm⁻². The prepared ZnS/NiCo₂S₄/NF//ASC device displayed both high power density and energy density (725 W kg⁻¹ at 39.88 Wh kg⁻¹). [ABSTRACT FROM AUTHOR]