MOF-derived sponge-like NiS2 with a hierarchical porous architecture for aqueous supercapacitors and Ni-Zn batteries

The development of high-performance supercapacitor electrodes relies on the rational design of material structures with optimized electrochemical properties. In this work, we report a two-dimensional sponge-like NiS 2 architecture synthesized via a MOF-derived sulfurization strategy. The unique hierarchical porous structure, featuring abundant mesopores and high specific surface area, facilitates efficient ion diffusion and provides numerous electroactive sites for redox reactions. The resulting NiS 2 electrode exhibits outstanding specific capacitance (1227.5 F g − 1 at 0.5 A g − 1 ) with good cycling stability in alkaline electrolyte. Moreover, the NiS 2 electrode demonstrates bifunctionality and can be effectively employed in aqueous Ni-Zn batteries, delivering high specific capacity and stable long-term performance. This study establishes NiS 2 as a promising electrode material for aqueous energy storage devices and provides a feasible synthetic pathway for designing high-performance transition metal sulfide electrodes.