Hydrogenation Ability of Mg-Li Alloys

Abstract

The Mg-Li binary system is characterized by the presence of α-Mg(Li) and β-Li(Mg) phases, where magnesium exists in ordered and disordered forms that may affect the hydrogenation properties of magnesium. Therefore, the hydrogenation properties of an AZ31 alloy modified by the addition of 4.0 wt.%, 7.5 wt.% and 15.0 wt.% lithium were studied. The morphology (scanning electron microscopy (SEM)), structure, phase composition (X-ray diffraction (XRD)) and hydrogenation properties (differential scanning calorimetry (DSC)) of AZ31 with various lithium contents were investigated. It was found that the susceptibility of magnesium in the form of α-Mg(Li) to hydrogenation was higher than that for the magnesium occupying a disordered position in β-Li(Mg) solid solutions. Magnesium hydride was obtained as a result of hydrogenation of the AZ31 alloy that was modified with 4.0 wt.%, 7.5 wt.% and 15.0 wt.% additions of lithium, and was characterized by high hydrogen desorption activation energies of 250, 187 and 224 kJ/mol, respectively.

Magnesium-Based Materials for Hydrogen Storage—A Scope Review

“…The most popular metal catalysts are transition metals, e.g., Al, Fe, Cu, Pd, Ni, V, Nb, Ti, Mn, and Cr (synthesized together with Mg by BM and RBM techniques) [ 85 , 94 , 95 , 96 , 97 , 98 , 99 , 100 , 101 , 102 , 103 , 104 ]. However, recently, some alkali metals have also been used [ 105 ]. Vitorri Antisari et al [ 93 ] showed a correlation between experimental results and a model describing the role of Fe catalyst particles in the nucleation step in the MgH 2 reaction.…”

Effect of ZrC Nanopowders on Enhancing the Hydro/Dehydrogenation Kinetics of MgH2 Powders

“…This system has a higher hydrogen storage density of 6.5 H atoms/cm 3 for MgH 2 when compared with pure hydrogen gas (0.99 H atoms/cm 3 ) or liquid hydrogen (4.2 H atoms/cm 3 ). Mg metal has various advantages for hydrogen storage, including low cost, light weight, and high gravimetric (7.60 wt%) and volumetric (110 g/L) hydrogen storage capacities [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. In spite of the attractive and useful properties of Mg/MgH 2 , there are some serious drawbacks that should be solved before using this system for FC-hydrogen storage applications.…”