nikkelhydrid

Nikkelhydrid, also known as nickel hydride, is a chemical compound with the formula NiH2. It is a solid material that is notable for its ability to absorb and release hydrogen gas, making it a useful material in hydrogen storage and battery applications. Nikkelhydrid is typically synthesized by reacting nickel with hydrogen gas at high temperatures and pressures.

The compound crystallizes in a hexagonal close-packed structure, similar to that of metallic nickel. It is a dark gray powder that is stable under normal conditions but can decompose upon heating, releasing hydrogen gas. Nikkelhydrid has a high hydrogen storage capacity, with one mole of NiH2 containing two moles of hydrogen.

One of the primary applications of nikkelhydrid is in nickel-metal hydride (NiMH) batteries. These batteries use a hydrogen-absorbing alloy, typically nikkelhydrid, as the negative electrode material. During charging, hydrogen is absorbed by the alloy, and during discharging, hydrogen is released. NiMH batteries are known for their high energy density, long cycle life, and relatively low cost compared to lithium-ion batteries.

Nikkelhydrid is also used in hydrogen storage systems, where it can absorb and release hydrogen gas reversibly. This property makes it a potential candidate for hydrogen fuel cell applications, where a reliable and efficient hydrogen storage system is crucial.

In summary, nikkelhydrid is a versatile material with applications in hydrogen storage and battery technology. Its ability to absorb and release hydrogen gas makes it a valuable component in the development of clean energy technologies.