Room-temperature synthesis of NiS hollow spheres on nickel foam for high-performance supercapacitor electrodes

- NiS hollow spheres were electrodeposited directly on Ni foam at room temperature.
- The NiS@NF composite showed high specific capacitance: 1553 F g−1 at 2.35 A g−1.
- The NiS@NF composite exhibited good cycling stability: 95.7% after 2000 cycles.

NiS hollow spheres were synthesized directly on the surface of Ni foam (NiS@NF) at room temperature via a simple electrodeposition in a KOH/thiourea solution without any Ni precursors. Morphological analysis revealed the formation of NiS hollow spheres, which consisted of nanoparticles. The NiS@NF nanocomposite exhibited a very high specific capacitance of 1553 F g−1 (2.64 F cm−2) at a current density of 2.35 A g−1 (4 mA cm−2) in 6 M KOH electrolyte. The NiS@NF nanocomposite also demonstrated excellent cycling stability (95.7% specific capacitance retention after 2000 cycles).

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