Membrane electrode assembly, polymer membrane, polymer electrolyte fuel cell, method for producing membrane electrode assembly, and method for producing polymer electrolyte fuel cell

摘要

Membrane electrode array (MEA) for polymer electrolyte fuel cell with operating temperature up to 250 degrees C has membrane of basic polymer(s), sandwiched between 2 flat gas distribution electrodes that are charged with dopant and act as dopant reservoir for the membrane. After pressure and heat treatment, the doped membrane is proton-conducting and firmly bound to the electrodes. When doped, its conductivity is not less than 0.1 S/m at a temperature not less than 25 degrees C. Independent claims are also included for the following: (1) polymer membrane for an MEA, consisting of a polymer containing basic polymer(s), with a mechanical stability of over 110 N/mm2 breaking strength and over 6% elongation at room temperature; (2) polymer electrolyte fuel cells for an operating temperature up to 250 degrees C with the specified MEA between bipolar plates.