Membrane-electrode unit, polymer membranes for a membrane-electrode unit, polymer electrolyte fuel cells, and methods for the production thereof

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.