What is a Nickel hydroxide (Ni(OH)₂)?

Nickel hydroxide (Ni(OH)₂) is a green or dark green powder, which is the hydroxide of nickel. It is an inorganic compound composed of nickel(II) ions and hydroxide ions. Nickel hydroxide is soluble in alkaline solutions but stable in acidic conditions. It is an essential material in electrochemical applications, particularly in rechargeable batteries such as nickel-metal hydride (NiMH) and nickel-cadmium (NiCd) batteries, where it plays a crucial role in energy storage and release through electrochemical reactions.

In industry, nickel hydroxide is used in nickel plating and surface treatment processes. It also finds applications in wastewater treatment for removing metal ions. Nickel hydroxide is relatively stable at high temperatures and is used in processes requiring such stability. However, as with most nickel compounds, it is toxic and should be handled with care, including using appropriate protective equipment.

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