SONG, Myoung-Youp; BAEK, Sung Hwan; BOBET, Jean-Louis; KWON, Sung Nam; HONG, Seong-Hyeon

doi:10.1007/s10853-009-3736-9

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SONG, Myoung-Youp
Division of Advanced Materials Engineering, Research Center of Advanced Materials Development

BAEK, Sung Hwan
Department of Hydrogen and Fuel Cells

BOBET, Jean-Louis
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Materials Science. 2009, vol. 44, n° 18, p. 4827-4833

Springer Verlag

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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 H2. 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 H2. The XRD pattern of 71.5 wt%Mg–23.5 wt%Ni–5 wt%Fe after reactive mechanical grinding exhibits MgH2 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, Mg2Ni, 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 MgH2 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.< Réduire

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Hydrogen-storage performance of an Mg–Ni–Fe alloy prepared by reactive mechanical grinding

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