Nanocrystalline composite for hydrogen storage

B - Operations – Transporting – 22 – F

Patent

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Details

B22F 1/00 (2006.01) B01J 20/04 (2006.01) C01B 3/00 (2006.01) C01B 6/24 (2006.01) H01M 8/06 (2006.01)

Patent

CA 2242555

Disclosed is a nanocrystalline composite useful for hydrogen storage, which provides optimum hydrogenation conditions along with high hydrogen storage capacity. This composite is the combination of at least one high temperature metal hydride as Mg or Mg2Ni, which has a high hydrogen storage capacity by weight but requires high temperatures for hydrogen absorption and desorption, with at least one low temperature metal hydride such as FeTi, LaNi5, Nb, Mn or Pd, which has a low hydrogen storage capacity by weight but does not require high temperatures for hydrogen absorption and desorption. The high and low temperature metal hydrides are in direct contact with each other and each in the form of a nanocrystalline powder or layer. This composite is particularly useful as a hydrogen supply source for hydrogen-fueled vehicles.

L'invention concerne un composite nanocristallin utile pour le stockage de l'hydrogène. Ce composite permet une hydrogénation optimale et il a une capacité de stockage élevée de l'hydrogène. Ce composite est la combinaison d'au moins un hydrure de métal haute température, par exemple de Mg ou Mg¿2?Ni ayant une capacité de stockage élevée de l'hydrogène, en poids, mais nécessitant des températures élevées pour l'absorption et la désorption de l'hydrogène, ainsi que d'un hydrure de métal basse température, par exemple de FeTi, LaNi¿5?, Nb, Mn ou Pd ayant une capacité de stockage basse, en poids, mais ne nécessitant pas des températures élevées pour l'absorption et la désorption de l'hydrogène. Les hydrures métalliques haute température et basse température sont mis mutuellement en contact direct, chacun étant présent sous la forme d'une poudre ou de couches nanocristallines. Ce composite est particulièrement utile somme source d'hydrogène pour les véhicules à hydrogène.

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