Membrane catalyst layer assembly with reinforcing films, membrane electrode assembly with reinforcing films, and polymer electrolyte fuel cells

摘要

A membrane-catalyst layer assembly with reinforcing films including a solid polymer electrolyte membrane 2, a catalyst layer 3 formed on each surface of the electrolyte membrane 2, and a reinforcing film 4 located on each surface of a membrane-catalyst layer assembly having the electrolyte membrane and the catalyst layers. Each of the reinforcing films 4 has a frame shape with a central opening 41. Each of the catalyst layers 3, except for an outer edge portion 31, is exposed through the opening 41. Each reinforcing film 4 has a first bonding layer 43 bonded to a membrane-catalyst layer assembly 10, and a gas barrier layer 42 formed on the first bonding layer 43 to prevent passage of a fuel gas and an oxidant gas.