Polymer electrolyte fuel cell electrolyte membrane, its production method and a polymer electrolyte fuel cell membrane electrode assemblies

It is possible power at high energy efficiency, regardless of the dew point of the feed gas, has a high power generation performance, and to provide a stable power generation can be a polymer electrolyte fuel cell electrolyte membrane for a long time . Ion-exchange capacity is a cation exchange membrane made of a fluoropolymer having a cation exchange group is 1.0 to 2.5 meq / g dry resin, partially cerium ions of the cation exchange group and an electrolyte membrane that is ion-exchanged with at least one member selected from the group consisting of manganese ions, for use as an electrolyte membrane for a polymer electrolyte fuel cell.