A membrane-electrode assembly having catalyst layers containing an electrode catalyst disposed on the both sides of an electrolyte membrane, wherein at least one of the above-described catalyst layers contains a non-precious metal electrode catalyst and an...

The present invention provides a polyarylene-based copolymer including a plurality of segments having an ion exchange group and a plurality of segments having substantially no ion exchange group, wherein at least one of the segments having an ion exchange ...

The present invention provides a polymer, a polymer electrolyte and the use thereof. The polymer has, as a structural unit, a phenylene group in which two or three hydrogen atoms each have been substituted with a group represented by the following formula ...