Hydrogen sorption properties of the nanocomposite 90 wt% Mg2Ni+10 wt% V

Addition of 3d-metals with formation of nanocomposites as a way to improve the hydrogenation characteristics of Mg2Ni

“…Comparison with the curves obtained under the same conditions in Ref. [19] for the composite 90 wt.% Mg 2 Ni-10 wt.% V (Fig. 2) shows that the addition of titanium as a second 3d-metal has a pronounced catalytic effect.…”

“…Obviously, the compensation for the reduced Mg 2 Ni content, which is mainly responsible for the hydrogen storage, is excessively ensured by the catalytic effect of the second 3d-metal. Similarly to the catalytic action of vanadium established previously [19], that of titanium can be explained by the formation of a nonstoichiometric hydride, TiH x . The X-ray patterns of the composite 85 wt.% Mg 2 Ni-10 wt.% V-5 wt.% Ti before and after hydriding (Fig.…”

“…It was of interest to see how far these additives were also able to affect the hydrogenation processes of Mg 2 Ni. This was made in a previous paper of the authors [19] dealing with the hydrogen sorption properties of the nanocomposite 90 wt.% Mg 2 Ni-10 wt.% V prepared by ball milling under argon or hydrogen. It was shown that the hydriding-dehydriding kinetics of this nanocomposite were improved as compared to the kinetics corresponding to pure Mg 2 Ni.…”

“…The investigation was carried out on a composite of 85 wt.% Mg 2 Ni-10 wt.% V-5 wt.% Ti an the data obtained on its hydrogenation properties were compared with those of the 90 wt.% Mg 2 Ni-10 wt.% V composite studied in Ref. [19].…”

Relationship between structure and sorption kinetic behaviour for ternary CeMX compounds

“…However, it does not mean that the previous hypothesis is wrong: in CeMnX compounds only the [Ce 4 ] tetrahedra are occupied. The role of transition metal as catalyst in the case of magnesium based mixtures [25] has been widely reported and the affinity of transition metals towards hydrogen is also well known. Then, the absence of transition metal in the interstitial site can explain the slower kinetic.…”