Structural and hydrogen storage properties of melt-spun Mg–Ni–Y alloys

Comparative investigations on the hydrogenation characteristics and hydrogen storage kinetics of melt-spun Mg10NiR (R = La, Nd and Sm) alloys

“…Generally, the amorphous or nanostructured MgeNieR alloys prepared by melt-spinning have faster hydrogen absorptionedesorption kinetics than the as-cast alloys [17e20]. The improvement of absorption kinetics can be ascribed to the nano-sized particles of rare earth metal hydrides and Mg 2 Ni embedded in Mg matrix after activation; and the enhancement of desorption kinetics is attributed to the nano-sized particles of rare earth metal hydrides and Mg 2 NiH 4 embedded in MgH 2 matrix after hydrogenation [9,10,21,22]. Recently a study on the in situ synchrotron X-ray diffraction of hydrogenated Mg 80 Ni 10 Y 10 during its vacuum thermal decomposition indicated that the dehydrogenation of YH 3 to YH 2 was much slower than the dehydrogenation transformations of MgH 2 to Mg and Mg 2 NiH 4 to Mg 2 Ni; and accordingly metallic Mg, intermetallic Mg 2 Ni, hydrides YH 2 and YH 3 coexisted in the sample after hydrogen desorption at 473 K for 1 h [23].…”

Severely deformed ZK60 + 2.5% Mm alloy for hydrogen storage produced by two different processing routes

“…Fine microstructures (preferably nanostructured) correspond to one of the most frequently used solutions to improve the hydrogen storage properties of magnesium [5]. This type of microstructures can be either obtained in the form of powders, by high-energy ball milling [6,7], or in the bulk form, by melt spinning [8,9] and severe plastic deformation techniques [10,11].…”

“…Catalysts such as Li [15], nanotubes [16], Ni [17] and rare earth elements [18,19] are especially effective at improving kinetics of hydrogen absorption/desorption. Nanocrystalline magnesium alloys can be prepared by rapid solidification methods such as melt spinning (MS) [9]. In some cases, MS also leads to the formation of an amorphous phase [20], which typically is crystallized to generate fine grains before hydrogenation.…”

“…In some cases, MS also leads to the formation of an amorphous phase [20], which typically is crystallized to generate fine grains before hydrogenation. Reports of good hydrogen storage properties have been published with several different systems like MgeNi [8] and MgeNieCu [20] and MgeNieY [9]. However, until the present moment, no research work has been published on MS of ZK60 alloy modified with mischmetal addition.…”

Effects of single- and co-substitution of Ti on dehydrogenation of Mg 2 NiH 4 : A first-principles study

“…It is found that co-substitution in MgH 2 exhibited a more remarkable improvement on the thermodynamic destabilizing and sorption kinetics of MgH 2 [29][30][31][32][33] dehydrogenation mechanism of simultaneous co-substitution of Ti for both Mg and Ni in Mg 2 NiH 4 would be valuable and necessary.…”