Evaluation of the metal-added Mg hydrogen storage material and comparison with the oxide-added Mg

A Mg–5 wt% Ni–2.5 wt% Fe–2.5 wt% Ti (named Mg–5Ni–2.5Fe–2.5Ti) hydrogen storage material was prepared by reactive mechanical grinding, and hydrogen absorption and desorption properties were then investigated by a Sievert's type volumetric apparatus. The activated Mg–5Ni–2.5Fe–2.5Ti sample absorbed 5.67 wt% H for 60 min at 573K under 12 bar H2 and desorbed 4.72 wt% H for 60 min at 573K under 1.0 bar H2. Mg–5Ni–2.5Fe–2.5Ti had a higher initial hydriding rate at 593K under 12 bar H2 and a higher dehydriding rate at 593K under 1.0 bar H2 than oxide-added Mg samples with Mg–xFe2O3–yNi compositions.