NiS2

Nickel disulfide (NiS₂) is a layered transition metal dichalcogenide semiconductor with a pyrite crystal structure, belonging to the family of materials increasingly explored for electronic and energy storage applications. It is primarily investigated in research and emerging technology contexts for use in catalysis, particularly electrochemical water splitting and hydrogen evolution reactions, as well as in next-generation battery and supercapacitor electrodes where its tunable electronic properties and layered structure offer advantages over conventional materials. The material's weak interlayer bonding (evidenced by readily exfoliable layers) makes it particularly interesting for creating two-dimensional nanostructures and heterostructures in nanoscale devices, though industrial-scale deployment remains limited compared to more established semiconductors.