Specifically, magnesium-based materials usually refer to compounds formed by magnesium and other elements or compounds, such as magnesium alloy, magnesium-aluminum alloy, magnesium-manganese alloy and so on. When these materials store hydrogen, their magnesium atoms can react with hydrogen atoms to produce magnesium and hydrogen compounds, that is, magnesium hydride.
The chemical formula of magnesium hydride is MgH2, and its hydrogen storage capacity is as high as 7.6 wt% (that is, 0.076 g hydrogen can be stored per gram of magnesium hydride), which is one of the metal hydrides with the highest hydrogen storage capacity at present.
In addition to high hydrogen storage capacity, magnesium-based materials also have the advantages of good reaction kinetics. The reaction speed of magnesium and hydrogen is fast, and the reaction is exothermic, which can accelerate the reaction speed and improve the hydrogen storage efficiency. In addition, magnesium-based materials are renewable and environmentally friendly materials, and the hydrogen produced in the process of hydrogen storage can be released through regeneration reaction to achieve the purpose of recycling.
In a word, magnesium-based materials have become an important hydrogen storage material with broad application prospects because of their high hydrogen storage capacity, good reaction dynamics, good reproducibility and environmental friendliness.
Problems needing attention in using magnesium-based materials
1, Prevention of oxidation: Magnesium-based materials are easy to react with oxygen in the air to generate oxides, so attention should be paid to preventing oxidation when using and storing, such as using sealed packaging and surface coating.
2. Anti-corrosion: Magnesium-based materials are easily corroded by chemicals such as acid, alkali and salt. Therefore, attention should be paid to anti-corrosion during use and storage, such as using anti-corrosion packaging and selecting suitable storage environment.
3. Prevention of hot cracking: Magnesium-based materials are prone to hot cracking at high temperature, and attention should be paid to temperature control and measures during processing and use, such as using cooling liquid and reducing processing speed.
4. Avoid collision: Magnesium-based materials are fragile and easily affected by external shocks and vibrations. Therefore, attention should be paid to prevent collision during use and transportation, such as taking cushioning measures and choosing appropriate packaging methods.
5. Pay attention to fire prevention: Magnesium-based materials are easy to burn at high temperature. Pay attention to fire prevention when using and storing, such as avoiding contact with fire sources and choosing suitable storage environment.