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

doi:10.1016/j.ijhydene.2010.07.161

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

BAEK, Sung Hwan
Division of Advanced Materials Engineering, Research Center of Advanced Materials Development

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

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International Journal of Hydrogen Energy. 2010, vol. 35, n° 19, p. 10366-10372

Elsevier

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A sample composition has been designed based on previously reported data. An 80 wt%Mg–13.33 wt%Ni–6.67 wt%Fe (referred to as Mg–13.33Ni–6.67Fe) sample exhibited higher hydriding and dehydriding rates after activation and a larger hydrogen storage capacity compared to those of other mixtures prepared under similar conditions. After activation (at n = 3), the sample absorbed 4.60 wt%H for 5 min and 5.61 wt%H for 60 min at 593 K under 12 bar H2. The sample desorbed 1.57 wt%H for 5 min and 3.92 wt%H for 30 min at 593 K under 1.0 bar H2. Rietveld analysis of the XRD pattern using FullProf program showed that the as-milled Mg–13.33Ni–6.67Fe sample contained Mg(OH)2 and MgH2 in addition to Mg, Ni, and Fe. The Mg(OH)2 phase is believed to be formed through the reaction of Mg or MgH2 with water vapor in the air. The dehydrided Mg–13.33Ni–6.67Fe sample after hydriding-dehydriding cycling contained Mg, Mg2Ni, MgO, and Fe.< Réduire

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Hydrogen storage properties of Mg

Addition of Ni and Fe

Reactive mechanical grinding

Mg2Ni formation

Mg(OH)2 formation

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Hydrogen storage properties of a Mg-Ni-Fe mixture prepared via planetary ball milling in a H2 atmosphere

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