Used as a catalyst in hydrogenation and dehydrogenation reactions, including the production of hydrogen from ammonia and the synthesis of methane from carbon monoxide and hydrogen, especially in organic synthesis and petrochemical processes.

Employed in the production of batteries, particularly as the positive electrode in nickel-based rechargeable systems like nickel-cadmium (Ni-Cd) and nickel-metal hydride (Ni-MH).

Serves as a pigment for ceramics and glasses, imparting green, gray, or black coloration depending on the firing conditions and proportions used.

Applied in the electronics industry for manufacturing thermistors and other ceramic components due to its semiconducting properties.

Utilized in fuel cells as an electrode material because of its electrochemical stability.

Found in gas sensors due to its ability to change resistance upon exposure to certain gases, in magnetic materials, and in the production of nickel metal from ores as an intermediate in chemical reactions.

Also used in the coating of certain metal surfaces for corrosion resistance.