Membrane-electrode assembly for high-temperature polymer electrolyte membrane fuel cell in catalyst-coated membrane form and method for manufacturing same

Abstract

A membrane-electrode assembly (MEA) for a polymer electrolyte membrane fuel cell is prepared by applying an electrode slurry onto a release sheet to form an electrode layer, providing an electrolyte membrane comprising a substrate doped with phosphoric acid, and transferring the electrode layer to create a catalyst-coated membrane (CCM). The electrode slurry contains a catalyst, ionomer(s), and a solvent, with a solid content of about 10-15% by weight. The release sheet, comprising polyimide and about 30-80 μm thick, allows uniform coating and transfer. The resulting electrolyte membrane, about 40-50 μm thick, is doped with about 5-9 mg/cm2 of phosphoric acid and includes a hydrocarbon-based polymer substrate. The final MEA exhibits a high-frequency resistance of about 100 mΩ·cm2 or less.

Dependencies are inferred from the claim text.