Improvement of hydrogen-storage properties of Mg by reactive mechanical grinding with Fe 2O 3 prepared by spray conversion

Abstract

Samples of Mg–10 wt.%Fe 2O 3 using nano-structured Fe 2O 3 synthesized by spray conversion were prepared by mechanical grinding under H 2 (reactive mechanical grinding) under the optimum conditions for the preparation of the sample Mg–10 wt.%Fe 2O 3 using purchased Fe 2O 3. The sample Mg–10 wt.%Fe 2O 3 as milled absorbed 3.87 wt.% hydrogen at 593 K under 12 bar H 2 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 H 2 for 60 min. Hydrogen-storage capacity is 6.67 wt.% under 12 bar H 2 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.