Ink for producing catalyst layers

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 11/00 (2006.01) B01J 35/12 (2006.01) C08J 5/22 (2006.01) H01M 4/86 (2006.01) H01M 4/88 (2006.01) H01M 8/10 (2006.01) C25B 11/08 (2006.01)

Patent

CA 2602551

The invention relates to an ink for producing catalyst layers for electrochemical devices. The ink comprises catalyst material, ionomer material, water and at least one organic solvent. The organic solvent belongs to the class of tertiary alcohol~s and/or the class of aliphatic diketones and bears functional groups which are stable to oxidative degradation in the ink. This prevents formation of decomposition products in the ink. The ink of the invention displays a high storage stability and is used for producing catalyst- coated substrates for electrochemical devices, in particular fuel cells (PEMFCs, DMFCs).

L'invention se rapporte à une encre permettant de produire des couches de catalyseur pour les dispositifs électrochimiques. Cette encre comprend un matériau catalyseur, un matériau ionomère, de l'eau et au moins un solvant organique. Le solvant organique fait partie de la classe des alcools tertiaires et/ou de la classe des dicétones aliphatiques, et comporte des groupes fonctionnels stables à la dégradation oxydative dans l'encre. Cette composition permet d'empêcher la formation de produits de décomposition dans l'encre. L'encre décrite présente une stabilité élevée à l'entreposage, et peut servir à produire de substrats à revêtement catalyseur destinés à des dispositifs électrochimiques, en particulier à des piles à combustible (PEMFC, DMFC).

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