Process of producing a polymer electrolyte membrane

摘要

The object of the present invention is to provide a simple and convenient method of producing a polymer electrolyte membrane exhibiting high proton conductivity. This object is achieved by a method of producing a polymer electrolyte membrane comprising a step of coating a liquid containing a polymer electrolyte and a solvent onto a substrate and a step of removing the solvent, wherein the solvent is a mixture of a first solvent comprising at least one selected from alcohol and water, and a second solvent comprising a non-alcoholic organic solvent having a boiling point lower than that of the first solvent. The present invention further provides a method of improving the proton conductivity of a polymer electrolyte membrane comprising a step of coating a liquid containing a polymer electrolyte and a solvent onto a substrate and a step of removing the solvent, wherein the solvent is a mixed solvent comprising at least one solvent selected from alcohol and water, and a non-alcoholic.