Hydrogen desorption kinetics of melt-spun and hydrogenated Mg90Ni10 and Mg80Ni10Y10 using in situ synchrotron, X-ray diffraction and thermogravimetry

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

“…Such a kinetic property is much better than that for Mg 90 Ni 10 alloy and equivalent to that for Mg 80 Ni 10 Y 10 alloy [23]. This indicates that the contribution to the enhancement in the hydrogen absorptionedesorption kinetics is actually from both the rare earth metal hydrides and Mg 2 NiH 0.3 (or Mg 2 NiH 4 ) [10,23]. Fig.…”

“…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]. This raises the question as to whether different rare earth metal hydrides have the same catalytic effect on the hydrogen absorptionedesorption in MgeNieR alloys.…”

Hydrogen storage properties of Mg–Ce–Ni nanocomposite induced from amorphous precursor with the highest Mg content

“…The melt-spun alloy exhibits much faster kinetics than the induction-melt one; it releases 4.1 wt.%-H within 10 min even at 513 K. In Zhang's study, the melt-spun Mg 12 YNi alloy desorbed only 2 wt.%-H in 10 min at 523 K [16]. From literatures, the more Mg means the more hydrogenation capacity, but at the expense of kinetic deterioration [27]. However, we can obtain decent hydrogen storage properties through reasonable alloying and efficient processing and avoid the capacity loss to less than 5 wt.%-H. Fig.…”

High glass forming ability correlated with microstructure and hydrogen storage properties of a Mg–Cu–Ag–Y glass

“…The proper addition of rear earth (Y, La, Ce) to Mg and Mg-Ni alloys by the RQ technique facilitates even more disordered systems, i.e. partially crystalline [13][14] or monolithic amorphous alloys [15][16][17][18] with further improved storage properties.…”