SONG, Myoung-Youp; KWON, Sung Nam; PARK, Hye Ryoung; BOBET, Jean-Louis

doi:10.1016/j.ijhydene.2011.07.054

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

KWON, Sung Nam
Department of Hydrogen and Fuel Cells

PARK, Hye Ryoung
Faculty of Applied Chemical Engineering

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International Journal of Hydrogen Energy. 2011, vol. 36, n° 20, p. 12932-12938

Elsevier

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An Mg-10wt%Ni-5wt%Fe-5wt%Ti sample was prepared by mechanical grinding under H2 (reactive mechanical grinding) using a planetary ball mill. The phases and their weight percentages were analyzed with the Full Proof program from the XRD patterns of the Mg-10Ni-5Fe-5Ti samples after reactive mechanical grinding and after dehydriding at the seventh cycle. The Mg-10Ni-5Fe-5Ti sample after reactive mechanical grinding contained Mg, TiH2, MgH2, and Ni phases, and the sample dehydrided at the seventh cycle contained Mg, TiH2, MgO, Mg2Ni, and Fe phases. The prepared Mg-10Ni-5Fe-5Ti sample had an effective hydrogen-storage capacity larger than 5 wt%H. The activated Mg-10Ni-5Fe-5Ti sample absorbed 5.31 and 5.51 wt%H for 5 and 60 min, respectively, at 573 K under 12 bar H2 and desorbed 1.58, 3.64, and 5.18 wt%H for 10, 30, and 60 min, respectively, at 573 K under 1.0 bar H2. The effects of reactive mechanical grinding, hydriding-dehydriding cycling, and addition of transition elements Ni, Fe, and Ti were discussed.< Leer menos

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Hydrogen-storage material

Reactive mechanical grinding (RMG)

Magnesium

Nickel

Titanium

Temperature dependence

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Improvement of hydriding and dehydriding rates of Mg via addition of transition elements Ni, Fe, and Ti

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