Hydrogen-storage performance of an Mg–Ni–Fe alloy prepared by reactive mechanical grinding
SONG, Myoung-Youp
Division of Advanced Materials Engineering, Research Center of Advanced Materials Development
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Division of Advanced Materials Engineering, Research Center of Advanced Materials Development
SONG, Myoung-Youp
Division of Advanced Materials Engineering, Research Center of Advanced Materials Development
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Division of Advanced Materials Engineering, Research Center of Advanced Materials Development
Language
en
Article de revue
This item was published in
Journal of Materials Science. 2009, vol. 44, n° 18, p. 4827-4833
Springer Verlag
English Abstract
The 71.5%Mg–23.5%Ni–5%Fe alloy prepared by reactive mechanical grinding for 4 h does not need activation. The activated sample has the hydriding rate of 0.494 wt%/min for 5 min and absorbs 3.32 wt% for 60 min at 593 K under ...Read more >
The 71.5%Mg–23.5%Ni–5%Fe alloy prepared by reactive mechanical grinding for 4 h does not need activation. The activated sample has the hydriding rate of 0.494 wt%/min for 5 min and absorbs 3.32 wt% for 60 min at 593 K under 1.2 MPa H<sub>2</sub>. It has the dehydriding rate of 0.330 wt%/min for 5 min and desorbs 2.42 wt%H for 20 min at 593 K 0.1 MPa H<sub>2</sub>. The XRD pattern of 71.5 wt%Mg–23.5 wt%Ni–5 wt%Fe after reactive mechanical grinding exhibits MgH<sub>2</sub> in addition to starting elements Mg, Ni, and Fe. 71.5 wt%Mg–23.5 wt%Ni–5 wt%Fe after hydriding–dehydriding cycling contains Mg, Mg<sub>2</sub>Ni, MgO, and Fe. The reactive mechanical grinding of Mg with Ni and Fe is considered to facilitate nucleation by creating many defects on the surface and in the interior of Mg, by the additive acting as active sites for the nucleation and shorten diffusion distances of hydrogen atoms by reducing the particle size of Mg. The MgH<sub>2</sub> formed in the as-milled 71.5 wt%Mg–23.5 wt%Ni–5 wt%Fe alloy is considered to lead to the creation of more defects and finer particle size.Read less <
Origin
Hal imported