In magnesium-based solid-state hydrogen storage technology, magnesium alloy is used as hydrogen storage material to store and release hydrogen by absorbing and releasing hydrogen. When magnesium alloy comes into contact with hydrogen, magnesium will absorb hydrogen and form magnesium hydride compound (MgH2). When the stored hydrogen needs to be released, magnesium hydride can be decomposed into magnesium and hydrogen by heating or pressurizing.
Magnesium matrix composites have the highest specific strength and modulus among similar metal matrix composites, and have good dimensional stability and excellent corrosion resistance in some media, so they have good application prospects. However, due to the high price, it is mainly used in aerospace and aviation departments.
Hydrogen storage characteristics of magnesium-based materials
1, high hydrogen storage density: magnesium-based solid-state hydrogen storage technology has high hydrogen storage density, and magnesium alloy can absorb and release a large amount of hydrogen to realize high-capacity hydrogen storage.
2. Relative safety: Compared with liquid hydrogen storage technology, magnesium-based solid hydrogen storage technology is relatively safe. Magnesium hydride compounds have high thermal stability and need to be decomposed at high temperature, which reduces the risk of hydrogen leakage and explosion.
3. Rich magnesium resources: Magnesium is one of the rich elements in the earth's crust, and the resources are relatively rich. Using magnesium as hydrogen storage material has the advantages of sustainability and economy.