ELECTROLYTE MEMBRANE FOR POLYMER ELECTOLYTE FUEL CELL, PROCESS FOR ITS PRODUCTION AND MEMBRANE-ELECTRODE ASSEMBLY FOR POLYMER ELECTROLYTE FUEL CELL

摘要

An electrolyte membrane containing cerium ions and composed of a cation-exchange membrane which is made of a polymer compound having a cation-exchangegroup is used as an electrolyte membrane for solid polymer fuel cells. Whenthe cation-exchange membrane has sulfonic acid groups, cerium ions arepreferably contained in an amount of 0.3-20% relative to the -SO3- groupscontained in the cation-exchange membrane, and for example, the sulfonic acidgroups are ion exchanged with the cerium ions. Consequently, there can beprovided an electrolyte membrane for solid polymer fuel cells which enables togenerate electricity at high energy efficiency and exhibits high powergeneration performance regardless of the dew point of a supply gas. Thiselectrolyte membrane for solid polymer fuel cells also enables to stablygenerate electricity for a long time.