Mg--Ni hydrogen storage composite having high storage capacity and excellent room temperature kinetics
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United States of America Patent
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May 1, 2007
Grant Date -
Jun 16, 2005
app pub date -
Dec 11, 2003
filing date -
Dec 11, 2003
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Expired
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Abstract
A hydrogen storage composite material having a Mg--Ni based alloy with a coating of a catalytically active metal deposited on at least a portion of a surface of said Mg--Ni based alloy. The coating is less than about 200 angstroms thick and preferably is formed from iron or palladium. The composite material is capable of adsorbing at least 3 weight percent hydrogen and desorbing at least 1 weight percent hydrogen at 30.degree. C. The Mg--Ni based alloy has a microstructure including both a Mg-rich phase and a Ni-rich phase, micro-tubes having an inner core of Ni-rich material surrounded by a sheathing of Mg-rich material, amorphous structural regions and microcrystalline structural regions.
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