Used primarily in rechargeable battery systems, especially in nickel-based batteries such as nickel-cadmium (NiCd) and nickel-metal hydride (NiMH) batteries, where it serves as the active material in the positive electrode. It participates in electrochemical reactions during charging and discharging, enabling efficient energy storage. Its good electrochemical stability and reversible redox behavior make it suitable for long-cycle-life battery applications. Also explored in supercapacitors and electrocatalysis due to its favorable charge transfer properties and layered structure that supports ion intercalation. Additionally, it is used in the production of other nickel-containing chemicals, such as catalysts for organic synthesis, and as a precursor for nickel compounds in surface coating and electronics industries.