Activated interface nanocomposites prepared by mechanical...

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 23/00 (2006.01) B22F 9/02 (2006.01) C01B 3/00 (2006.01) C01B 6/04 (2006.01) H01M 4/38 (2006.01) H01M 8/04 (2006.01) H01M 8/06 (2006.01) H01M 4/02 (2006.01) H01M 10/34 (2006.01)

Patent

CA 2217095

The invention concerns a preparation process for a magnesium-based nanocomposite and another element or compound known for absorbing hydrogen and being non-miscible upon grinding with magnesium or its hydride, such as vanadium or nobium. According to this process, magnesium or a magnesium-based compound known for absorbing hydrogen is subjected to hydrogenation with a view to producing the corresponding hydride in powder form. The resulting hydride powder is mixed with the other element or compound or a hydride of this other element or compound and the resulting mixture is subjected to intense mechanical grinding until the corresponding nanocomposite in hydride form is obtained. The nanocomposite produced in this way is subjected to hydrogen desorption. The invention also concerns the Mg-based nanocomposite thus prepared which has the advantage of being inexpensive and having unrivalled performance for hydrogen storage because of its microstructure (that is, the nature of the interfaces and spatial distribution of its components) which is extremely fine and gives rise to an incredible synergy effect between the Mg and the other element or compound.

L'invention vise un procédé de préparation d'un nanocomposite à base de magnésium et d'un autre élément ou composé connu pour absorber l'hydrogène et être peu miscible au broyage avec le magnésium ou son hydrure, tel le vanadium ou le nobium. Selon ce procédé, on soumet le magnésium ou un composé à base de magnésium connu pour absorber l'hydrogène à une hydrogénation en vue d'obtenir l'hydrure correspondant sous la forme d'une poudre. On mélange alors la poudre d'hydrure ainsi obtenue avec l'autre élément ou composé ou un hydrure de cet autre élément ou composé et on soumet le mélange ainsi obtenu à un broyage mécanique intense jusqu'à obtention du nanocomposite correspondant sous la forme d'un hydrure. Enfin, on soumet le nanocomposite ainsi obtenu à une désorption d'hydrogène. L'invention vise aussi le nanocomposite à base de Mg ainsi préparé, qui a l'avantage d'être peu coûteux et d'avoir des performances inégalées pour le stockage de l'hydrogène grâce à sa microstructure(c'est-à-dire à la nature des interfaces et à la distribution spatiale de ses composantes) qui est extrêmement fine et donne lieu à un effet de synergie incroyable entre le Mg et l'autre élément ou composé.

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