Nickel sulfide is primarily used in the production of catalysts for hydrotreating processes in petroleum refining, where it helps remove sulfur and other impurities from crude oil fractions. It is also employed in certain types of rechargeable batteries, particularly in nickel-based systems, due to its electrochemical properties. In materials science, nickel sulfide finds use in semiconductor applications and as a component in some high-temperature ceramics. Additionally, it is utilized in the synthesis of other nickel compounds and in specialized pigments for ceramics and glass, where it contributes to color development. Its role in solar energy materials is being explored due to its ability to absorb light efficiently in photovoltaic systems.