C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/04 (2006.01) B01J 25/00 (2006.01) B01J 32/00 (2006.01) B01J 37/06 (2006.01) B22F 1/00 (2006.01) B22F 9/04 (2006.01) B22F 9/16 (2006.01) C01B 3/00 (2006.01) C22C 1/08 (2006.01) C22C 3/00 (2006.01) H01M 4/38 (2006.01) H01M 4/90 (2006.01) H01M 4/92 (2006.01) H01M 8/06 (2006.01)
Patent
CA 2269902
The invention concerns leached nanocrystalline materials having a large specific surface area particularly useful for storing hydrogen or for making electrodes for catalysis or electrocatalysis, such as those used in fuel cells. These materials can be made by preparing a nanocrystalline material consisting of a metastable composite or alloy of at least two distinct chemical elements. To be nanocrystalline, the material should have a crystalline structure with crystals less than 100 nn. in size. The prepared nanocrystalline material is then subjected to a leaching so as to eliminate partly or totally at least one of the elements of the composite or alloy. This leaching gives the resulting material a porous structure and, hence the required large specific surface area.
Des matériaux nanocristallins lixiviés ayant une grande surface spécifique sont particulièrement utiles pour stocker de l'hydrogène ou pour la fabrication d'électrodes pour la catalyse ou l'électrocatalyse, telles que celles utilisées dans les piles à combustile. Ces matériaux peuvent être fabriqués en préparant un matériau nanocristallin constitué d'un composite ou d'un alliage métastable d'au moins deux éléments chimiques distincts. Pour être nanocristallin, le matériau doit avoir une structure cristalline avec des cristaux de taille inférieure à 100 nn. Le matériau nanocristallin ainsi préparé est alors soumis à une lixiviation de façon à éliminer partiellement ou totalement au moins un des éléments du composite ou de l'alliage. Cette lixiviation donne au matériau résultant une structure poreuse et, de là, la grande surface spécifique requise.
Denis Marie-Chantal
Dodelet Jean-Pol
Guay Daniel
Huot Jacques
Lalande Guy
Hydro-Quebec
Robic
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