Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 455, Issue 1-2, Pages 432-439Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2007.01.138
Keywords
hydrogen storage materials; intermetallics; nanostructures; high-energy ball milling; X-ray diffraction
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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 MgH2-catalyst absorbing materials were prepared by ball milling of pure MgH2 with hydrided Zr47Ni53, Zr9Ni11, and other investigated alloys. The nanostructured MgH2-intermetallic systems were tested at 250 degrees C and catalyst addition of eutectoid Zr47Ni53 resulted in the fastest desorption time and highest initial desorption rate. Also, the catalyzed Mg-hydride with activated Zr9Ni11 and Zr7Ni10 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. (C) 2007 Elsevier B.V. All rights reserved.
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