Improvement of hydrogen-storage properties of Mg by reactive mechanical grinding with Fe2O3 prepared by spray conversion

Samples of Mg-10 wt.%Fe2O3 using nano-structured Fe2O3 synthesized by spray conversion were prepared by mechanical grinding under H2 (reactive mechanical grinding) under the optimum conditions for the preparation of the sample Mg-10 wt.%Fe2O3 using purchased Fe2O3. The sample Mg-10 wt.%Fe2O3 as milled absorbed 3.87 wt.% hydrogen at 593 K under 12 bar H2 for 60 min. Its activation was accomplished after two hydriding-dehydriding cycles. The activated sample absorbed 5.55 wt.% hydrogen at 593 K, 12 bar H2 for 60 min. Hydrogen-storage capacity is 6.67 wt.% under 12 bar H2 at 593 K (from P-C-T curve). The effects of reactive mechanical grinding and hydriding-dehydriding cycling on the hydrogen properties of Mg were discussed.