Hydrogen-storage properties of Mg–oxide alloys prepared by reactive mechanical grinding

Abstract The samples Mg–10 wt.% M (M = Fe 2 O 3 purchased, Fe 2 O 3 by spray conversion, MnO purchased, and SiO 2 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 2 O 3 using purchased Fe 2 O 3 . The activated Mg–10 wt.% Fe 2 O 3 by spray conversion has the highest hydriding rate ( H a  = 5.55 wt.% at 593 K, 12 bar H 2 for 60 min) of all the samples. The activated Mg–10 wt.% MnO has the highest dehydriding rate ( H d  = 1.94 wt.% at 593 K, 1.0 bar H 2 for 60 min). The equilibrium plateau pressure is about 1.5 bar H 2 . The effects of reactive mechanical grinding and hydriding–dehydriding cycling on the hydrogen properties of Mg were discussed.