There is a strong chemical reaction between magnesium and hydrogen. High hydrogen storage capacity: Magnesium is a light metal with low density and high hydrogen storage capacity. Each gram of metallic magnesium can store about 1.6 liters of hydrogen, which makes magnesium-based materials have high hydrogen storage capacity. There is a strong chemical reaction between magnesium and hydrogen to produce magnesium hydride (MgH2), which is reversible and can release the stored hydrogen under appropriate conditions.