Polymer electrolyte membrane sheet, polymer electrolyte membrane roll, electrolyte membrane with catalyst layer, membrane electrode assembly, electrochemical hydrogen pump and water electrolyzer

摘要

PROBLEM TO BE SOLVED: To have excellent hydrogen barrier property, and to achieve excellent proton conductivity, excellent mechanical strength, physical durability and chemical stability under low humidification condition and humidification condition. Provided is a polymer electrolyte membrane for an electrochemical hydrogen pump or a water electrolyzer with excellent practicality. A polymer electrolyte membrane made of an ionic group-containing aromatic hydrocarbon polymer for an electrochemical hydrogen pump or a water electrolyzer: per unit area at 80 ° C. and 25% relative humidity. The proton conductivity is 0.12 S / cm2 or more; the proton conductivity per unit area is 8 S / cm2 or more in an atmosphere of 80 ° C. and 90% relative humidity; hydrogen permeation in an atmosphere of 80 ° C. and 90% relative humidity. Degree is 3.0 × 10-7 cm3 · (cm2 · s · cmHg) -1 or less; tensile breaking strength of a film with a width of 10 mm under an atmosphere of 25 ° C and 60% relative humidity is 100,000 N or more; tensile elongation at break A polymer electrolyte membrane that is 150% or more; [Selection diagram] None