Nickel selenide is widely used in electronic and optoelectronic devices due to its semiconductor properties. It serves as an efficient electrode material in solar cells and thin-film transistors. The compound is also employed in catalytic applications, particularly in hydrogen evolution reactions for water splitting, making it valuable in renewable energy systems. In addition, nickel selenide finds use in thermoelectric materials, where it helps convert waste heat into electrical energy. Its high thermal and chemical stability enhances performance in harsh operating conditions. Research is ongoing into its application in lithium-ion batteries and supercapacitors as an active material for improved energy storage.