Hydrogen-Storage Properties of Li_3N, OBH_4, Fe and/or li-Added Mg or MgH_2

摘要

In order to increase the hydrogen storage performance of Mg or MgH_2-based materials, Li_3N, LiBH_4, Fe, and/or Ti were added. Mixtures with compositions of 50MgH_2-50Li_3N, 40Mg-10MgH_2-50Li_3N, 68MgH_2-17LiBH_4-15Fe, and 70MgH_2-17LiBH_4-13Ti were prepared by reactive mechanical grinding, and their hydrogen-storage properties were examined. 68MgH_2-17LiBH_4-15Fe and 70MgH_2-17LiBH_4-13Ti had higher hydriding rates than the Li_3N-containing samples, 50MgH_2-50Li_3N and 40Mg-10MgH_2-50Li_3N, at 573 K under 12 bar H_2. However, the dehydriding rates of 68MgH_2-17LiBH_4-15Fe and 70MgH_2-17LiBH_4-13Ti were as low as those of the Li_3N-containing samples at 573 K under 1.0 bar H_2.