Development of Magnesium-Based Material with Hydrogen-Storage Capacity of 7 wt

TiCl₃ was chosen as an additive to increase hydriding and dehydriding rates of Mg. In our previous works, we found that the optimum percentage of additives that improved the hydriding and dehydriding features of Mg was approximately ten. Specimens consisting of 90 wt% Mg and 10 wt% TiCl₃ (named Mg-10TiCl₃) were prepared by high-energy ball milling in hydrogen. The specimens' hydriding and dehydriding properties were then studied. Mg-10TiCl₃ had an effective hydrogenstorage capacity (the quantity of hydrogen absorbed in 60 min) of approximately 7.2 wt% at 593 K under 12 bar H₂ at the second cycle. After high-energy ball milling in hydrogen, Mg-10TiCl₃ contained Mg, β-MgH₂, and small amounts of γ-MgH₂ and TiH_1.924. TiH_1.924 remained undercomposed even after dehydriding at 623 K in a vacuum for 2 h. The hydriding and dehydriding properties of Mg-10TiCl₃ were compared with those of other specimens such as Mg-10Fe₂O₃, Mg-10NbF₅, and Mg-5Fe₂O₃-5Ni, for which the hydrogen-storage properties were previously reported.