Effect of activated alloys on hydrogen discharge kinetics of MgH2 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 MgH2-catalyst absorbing materials were prepared by ball milling of pure MgH2 with hy...

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Bibliographic Details
Published in:Journal of alloys and compounds 2008-05, Vol.455 (1-2), p.432-439
Main Authors: DEHOUCHE, Z, PERETTI, H. A, HAMOUDI, S, YOO, Y, BELKACEMI, K
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Chemical and electrochemical properties
Energy
Exact sciences and technology
Fuels
Hydrogen
Metals. Metallurgy
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Summary: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 deg 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.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2007.01.138