Process for the manufacture of catalyst-coated substrates...

Details Process for the manufacture of catalyst-coated substrates... Process for the manufacture of catalyst-coated substrates...

H - Electricity

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H01M 4/88 (2006.01) B01D 67/00 (2006.01) B01J 37/02 (2006.01) C25B 11/06 (2006.01) H01M 4/94 (2006.01) B01D 53/22 (2006.01)

Patent

CA 2436261

The present invention relates to the field of electrochemical cells and fuel cells, and more specifically to polymer-electrolyte-membrane (PEM) fuel cells. It provides a process for the manufacture of catalyst-coated substrates for membrane fuel cells. The catalyst-coated substrates (e.g. catalyst-coated membranes ("CCMs"), catalyst-coated backings ("CCBs") and catalyst-coated tapes) are manufactured in a new process comprising the coating of the substrate with a water-based catalyst ink in a compartment maintaining controlled humidity and temperature. After deposition of the ink, the substrate is subjected to a leveling process at controlled humidity and temperature conditions. Very smooth and uniform catalyst layers are obtained and the production process is improved. The catalyst coated membranes (CCMs), catalyst coated backings (CCBs) and catalyst-coated tapes manufactured according to this process are used in the production of three-layer and five-layer MEAs. These MEAs find use in PEMFC and DMFC stacks.

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