The electrochemical hydriding properties of Mg–Ni–Zr amorphous alloy

Morphologic, Structural, Steric, Energetic and Thermodynamic Studies of the Mechanical Alloy Mg50Ni45Ti5 for Hydrogen Storage

“…Also we can conclude that the sites types 2 are trapping sites, as they have the lowest absorption energy [42]. However, those types 1 are very active sites generated during the mechanical milling by the creation of active surfaces.…”

“…All this accelerate and might promotes the anchoring of hydrogen atoms in sites type 1 and 2. Moreover in increasing the temperature, the rate and the kinetic of oxidation augment [42]. It is the same behaviors for the TiO 2 [43].…”

“…Hence, new sites types 1 are created and collaborate in the absorption process. Also the decrease of this parameter can be explained by the activation of deep trapping sites for the hydrogen [42]. Moreover, the presence of a large number of grain boundaries and surface defects due to mechanical grinding would facilitate the diffusion of hydrogen in the matrix.…”

“…For Nm 1 (Figure 8), it diminishes from 5.33 (sites/unit of volume) for T=313 K to 2.038 (sites/ unit of volume) for T=340 K. For Nm 2 ( Figure 9), it decreases from 0.16 (sites/unit of volume) for T=313 K to 0.04 (sites/unit of volume) for T=340 K. This behavior is the result of the thermal agitation, since the later causes the destruction and/or the blockage of some sites. Also by increasing temperature the oxidation rate raises [42,43] hence receptors sites can be occupied and blocked by these impurities. This behavior can be explained by the buildup of n 2 hydrogen atoms agglomerate (Figure 7) with the increase of temperature.…”

Hydrogen Absorption Performance of Mechanically Alloyed (Mg<SUB>2</SUB>Ni)<SUB>100&minus;<I>x</I></SUB>Ti<I><SUB>x</SUB></I> Powder

“…The hydrogen absorption properties can thus be improved. 6,7) Excluding the means of MA, the addition of extraneous elements such as Al, 8) Zr, 9) and Ag 10) introducing lattice strains is also a thinkable methodology to improve the hydrogen storage properties.…”