Mg-ni hydrogen storage composite having high storage...

Details Mg-ni hydrogen storage composite having high storage... Mg-ni hydrogen storage composite having high storage...

B - Operations, Transporting

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B01J 23/00 (2006.01) B01J 23/40 (2006.01) B01J 23/42 (2006.01) B01J 23/44 (2006.01) B01J 23/58 (2006.01) B01J 23/70 (2006.01) B01J 23/74 (2006.01) H01M 4/32 (2006.01) H01M 4/36 (2006.01) H01M 4/58 (2006.01)

Patent

CA 2548094

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~C. The Mg-Mi 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.

La présente invention concerne un matériau composite de stockage d'hydrogène comprenant un alliage à base de Mg-Ni avec un revêtement de métal à action catalytique déposé sur au moins une partie de la surface dudit alliage à base de Mg-Ni. Le revêtement a une épaisseur inférieure à environ 200 .ANG. et est de préférence constitué de fer ou de palladium. Le matériau composite est capable d'absorber au moins 3 % en poids d'hydrogène et de désorber au moins 1 % en poids d'hydrogène à 30 ·C. l'alliage à base de Mg-Mi a une microstructure qui comprend à la fois une phase riche en Mg et une phase riche en Ni, des micro-tubes présentant un coeur interne de matériau riche en Ni entourés d'une enveloppe de matériau riche en Mg, des zones structurelles amorphes et des zones structurelles microcristallines.

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