Nickel selenide is widely used in electrochemical applications due to its high electrical conductivity and catalytic activity. It serves as an effective electrode material in batteries, particularly in lithium-ion and sodium-ion systems, where it contributes to improved charge storage and cycling stability. It is also employed in supercapacitors for energy storage devices that require rapid charging and long cycle life.

In the field of renewable energy, nickel selenide acts as a catalyst in hydrogen evolution reactions (HER), making it valuable for water splitting and hydrogen production. Its performance rivals that of more expensive materials like platinum, offering a cost-effective alternative for clean fuel generation.

Additionally, nickel selenide is used in photovoltaic cells and optoelectronic devices because of its favorable semiconductor properties. Thin films of nickel selenide are applied in solar cells to enhance light absorption and electron transport.

It also finds use in sensors and electronic components due to its stable response to environmental changes and good sensitivity. Overall, its versatility in energy conversion, storage, and sensing technologies makes it a key material in advanced functional devices.