Effect of activated alloys on hydrogen discharge kinetics of MgH\u2082 nanocrystals

Activated alloys synthesized by arc-melting were examined as catalysts for improving the hydrogen sorption characteristics of nanostructured magnesium hydride, proposed as a reversible hydrogen storage material. The MgH\u2082-catalyst absorbing materials were prepared by ball milling of pure MgH\u2082 with hydrided Zr\u2084\u2087Ni\u2085\u2083, Zr\u2089Ni\u2081\u2081, and other investigated alloys. The nanostructured MgH\u2082-intermetallic systems were tested at 250 \u25e6C and catalyst addition of eutectoid Zr\u2084\u2087Ni\u2085\u2083 resulted in the fastest desorption time and highest initial desorption rate. Also, the catalyzed Mg-hydride with activated Zr9Ni11 and Zr\u2087Ni\u2081\u2080 phases showed fast desorption kinetics. Moreover, the results demonstrated that the composition of dispersed ZrxNiy catalysts has a strong influence on the amount of accumulated hydrogen and desorption rate of Mg-nanocomposite.Peer reviewed: YesNRC publication: Ye