Effects of ball-milling conditions on dehydrogenation of Mg(NH2)2–MgH2

Comparisons between MgH2- and LiH-containing systems for hydrogen storage applications

“…it has been shown that reaction (11) can proceed at room temperature after high-energy ball milling [16], and so can reaction (12) [29,37]. For reaction (13) it can take place at temperatures above 175 1C [12,29,32,37]. Therefore, there is no doubt that, for dehydrogenation of the ð2LiNH 2 þ MgH 2 Þ mixture at 210 1C, reactions (11)-(13) can occur simultaneously, as supported by all the evidence gathered in this study.…”

“…These studies include the mixtures of ð2LiNH 2 þ CaH 2 Þ [22], ð3MgðNH 2 Þ 2 þ 8LiHÞ [12,26,27], ðMgðNH 2 Þ 2 þ 4LiHÞ [20,[28][29][30][31], ðMgðNH 2 Þ 2 þ 3LiH or LiHÞ [24], ðMgðNH 2 Þ 2 þ MgH 2 Þ [29,32,33], and ðMgðNH 2 Þ 2 þ 2MgH 2 Þ [29]. However, all of these Li-Mg-N-H systems either exhibit higher hydrogen sorption and desorption temperatures or possess lower hydrogen storage capacities than ðMgðNH 2 Þ 2 þ 2LiHÞ and ð2LiNH 2 þ MgH 2 Þ systems.…”

Direct synthesis of MgH2 nanofibers at different hydrogen pressures

“…The activation barrier of MgH 2 makes it unfit for the practical use as a hydrogen storage material or as a starting material for the synthesis of other hydrogen storage materials. However, MgH 2 has been used as the starting chemical with an amide to produce lightweight metal-based hydrogen storage materials [13][14][15]. MgH 2 can also be used in portable fuel cells, wherein it undergoes hydrolysis with pure water to produce 15.2 mass% of hydrogen [16,17].…”

Novel hydrogen storage materials: A review of lightweight complex hydrides

“…Instead of the expected interaction between amide and hydride, they only observed the self-decomposition of Mg(NH 2 ) 2 [274]. However, Hu et al [278,279] showed that hydrogen desorption from Mg(NH 2 ) 2 and MgH 2 (at either a 1:1 or 1:2 molar ratio) can occur under a mechanochemical reaction condition, i.e. energetic ball milling, as shown by the reactions [278,279]:…”