Hydrogen storage properties of pure Mg

摘要

The hydrogen storage properties of pure Mg are investigated at 573 K under 12 bar H_2. In addition, in order to increase the hydriding and dehydriding rates of pure Mg, it is ground under hydrogen (reactive mechanical grinding, RMG), and its hydrogen storage properties are investigated. The pure Mg absorbs hydrogen very slowly. At n = 1, the pure Mg absorbs 0.05 wt.% H for 5 min, 0.08 wt.% H for 10 min, and 0.29 wt.% H for 60 min at 573 K under 12 bar H_2. The hydriding rate decreases as the number of cycles increases from n = 7. At n = 7, the pure Mg absorbs 0.96 wt.% H for 5 min, 1.29 wt.% H for 10 min, and 2.20 wt.% H for 60 min. At n = 1, the pure Mg after RMG does not absorb hydrogen. The hydriding rate of pure Mg after RMG increases as the number of cycles increases from n=lton=ll. The pure Mg after RMG absorbs 1.91 wt.% H for 5 min, 2.61 wt.% H for 10 min, and 3.65 wt.% H for 60 min at n = 11. The reactive mechanical grinding of the pure Mg and the hydriding-dehydriding cycling of the pure Mg after RMG are believed to create defects on the surface and in the interior of Mg particles and to form cracks in Mg particles.