Abstract
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 2-catalyst absorbing materials were prepared by ball milling of pure MgH 2 with hydrided Zr 47Ni 53, Zr 9Ni 11, and other investigated alloys. The nanostructured MgH 2-intermetallic systems were tested at 250 °C and catalyst addition of eutectoid Zr 47Ni 53 resulted in the fastest desorption time and highest initial desorption rate. Also, the catalyzed Mg-hydride with activated Zr 9Ni 11 and Zr 7Ni 10 phases showed fast desorption kinetics. Moreover, the results demonstrated that the composition of dispersed Zr x Ni y catalysts has a strong influence on the amount of accumulated hydrogen and desorption rate of Mg-nanocomposite.
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