Hydrogen and most metals can occur Combination reaction That is, most metals have the function of hydrogen storage. Among them, hydrogen, alkali metal and beryllium alkaline-earth metal The combination reaction of nickel (Ni) is generally carried out at a higher temperature, while the combination with some metals in zone d or f requires more special conditions, for example, nickel (Ni) can form stable hydride under high pressure. [1] In industrial production, Hydrogen storage material Most are alloys rather than pure metals. Successful research in the world Hydrogen storage alloy It can be roughly divided into: [2] (1) Rare earth La Ni alloy can store 153L hydrogen per kilogram; [2]
(2) Iron titanium alloy, with large hydrogen storage capacity and low price, can release hydrogen under normal temperature and pressure; [2]
(3) Magnesium alloy with the largest hydrogen absorption capacity Hydrogen storage material , but hydrogen can be released at 287 ℃, and hydrogen absorption is very slow; [2] （4） vanadium 、 niobium , lead and other multi-element systems. These metals themselves are rare and precious metals, so they are only suitable for certain special occasions. Compared with other hydrogen storage methods, metal hydride hydrogen storage has the advantages of stable pressure, simple hydrogen filling, safety and convenience. The density of hydrogen storage per unit volume can reach 1000 times of gaseous hydrogen under the same temperature and pressure. The existing problems of this hydrogen storage method are how to improve the hydrogen storage capacity of hydrogen storage materials, reduce material costs and save precious metals in large-scale applications. The standard of future new storage materials determined by the International Energy Agency is that the hydrogen storage capacity should be greater than 5Wt% and can absorb and release hydrogen under mild conditions. According to this standard, Hydrogen storage alloy Most of them cannot meet this performance requirement. [2] 
