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  4. Structural and hydrogen storage properties of melt-spun Mg-Ni-Y alloys
 
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2009
Journal Article
Title

Structural and hydrogen storage properties of melt-spun Mg-Ni-Y alloys

Abstract
Nanocrystalline magnesium-rich Mg-Ni-Y alloys were produced by melt-spinning. They were characterized regarding their microstructure, crystallization behaviour, and cyclic hydrogenation/dehydrogenation properties in view of their application as reversible hydrogen storage materials. Transmission electron microscopy reveals that these alloys consist in the as-spun state of mixtures of nanocrystalline Mg(Ni;Y) grains that are embedded in an amorphous matrix. Differential scanning calorimetry and X-ray diffraction analysis show that these alloys undergo several crystallization steps in the temperature range between 180 and 370 degrees C. It was found that only a few thermal activation cycles of the as-quenched ribbons are required in order to reach excellent hydrogenation/dehydrogenation properties of these alloys. In thermogravimetric analyses using a magnetic suspension balance it could be shown that these alloys can reach reversible gravimetric hydrogen storage densities of up to 5.3 wt.%-H with hydrogenation and dehydrogenation rates of up to 1 wt.%-H/min even at temperatures of 250 degrees C. The structure of the alloys remains nanocrystalline even after several hydrogenation/dehydrogenation cycles.
Author(s)
Kalinichenka, S.
Röntzsch, L.
Kieback, B.
Journal
International journal of hydrogen energy  
DOI
10.1016/j.ijhydene.2009.07.053
Language
English
Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM  
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