Disclosed are a polymer electrolyte membrane for a fuel cell, a membrane-electrode assembly including the same, a fuel cell and a method of manufacturing the polymer electrolyte membrane for a fuel cell. Particularly, the polymer electrolyte membrane for a fuel cell may include ionomer layers including a voltage reversal tolerance-increasing additive including a water electrolysis catalyst and an electrical conductor and provided on a porous reinforced film.

Disclosed are a polymer electrolyte membrane for a fuel cell, a membrane-electrode assembly including the same, a fuel cell and a method of manufacturing the polymer electrolyte membrane for a fuel cell. Particularly, the polymer electrolyte membrane for a fuel cell may include ionomer layers including a voltage reversal tolerance-increasing additive including a water electrolysis catalyst and an electrical conductor and provided on a porous reinforced film.

Disclosed are a polymer electrolyte membrane having high flexibility, high ionic conductivity, and excellent mechanical durability, a method for manufacturing same, and an electrochemical device comprising same. The polymer electrolyte membrane of the present invention comprises a polymer electrolyte material, wherein the polymer electrolyte material comprises: an ion conductor having an ion-exchange group; and an organic compound which binds to the ion-exchange group via an ionic bond or a hydrogen bond, thereby allowing the polymer electrolyte material to have an ionic crosslink structure or a hydrogen bond crosslink structure.

Disclosed are a polymer electrolyte membrane having high flexibility, high ionic conductivity, and excellent mechanical durability, a method for manufacturing same, and an electrochemical device comprising same. The polymer electrolyte membrane of the present invention comprises a polymer electrolyte material, wherein the polymer electrolyte material comprises: an ion conductor having an ion-exchange group; and an organic compound which binds to the ion-exchange group via an ionic bond or a hydrogen bond, thereby allowing the polymer electrolyte material to have an ionic crosslink structure or a hydrogen bond crosslink structure.

A composite polymer electrolyte membrane comprising a nanofiber sheet having a basis weight of 1.5 g/m.sup.2 or more and 4.0 g/m.sup.2 or less, and a proton-conducting polymer, the electrolyte membrane having a sheet shape in which the proton-conducting polymer and the nanofiber sheet are combined, and having an average coefficient of linear expansion of 300 ppm/K or less from 20° C. to 120° C. in an in-plane direction of the sheet shape.

A composite polymer electrolyte membrane comprising a nanofiber sheet having a basis weight of 1.5 g/m.sup.2 or more and 4.0 g/m.sup.2 or less, and a proton-conducting polymer, the electrolyte membrane having a sheet shape in which the proton-conducting polymer and the nanofiber sheet are combined, and having an average coefficient of linear expansion of 300 ppm/K or less from 20° C. to 120° C. in an in-plane direction of the sheet shape.

A composite polymer electrolyte membrane including a polymer electrolyte and a porous substrate, and having a dry tensile modulus of 100 N/cm or more per width and a wet tensile modulus of 35 N/cm or more per width. Enhancing the mechanical characteristics of the electrolyte membrane results in providing an electrolyte membrane that achieves good dry-wet cycle durability.

A composite polymer electrolyte membrane including a polymer electrolyte and a porous substrate, and having a dry tensile modulus of 100 N/cm or more per width and a wet tensile modulus of 35 N/cm or more per width. Enhancing the mechanical characteristics of the electrolyte membrane results in providing an electrolyte membrane that achieves good dry-wet cycle durability.

Poly(aryl piperidinium) polymers with pendant cationic groups are provided which have an alkaline-stable cation, piperidinium, introduced into a rigid aromatic polymer backbone free of ether bonds. Hydroxide exchange membranes or hydroxide exchange ionomers formed from these polymers exhibit superior chemical stability, hydroxide conductivity, decreased water uptake, good solubility in selected solvents, and improved mechanical properties in an ambient dry state as compared to conventional hydroxide exchange membranes or ionomers. Hydroxide exchange membrane fuel cells comprising the poly(aryl piperidinium) polymers with pendant cationic groups exhibit enhanced performance and durability at relatively high temperatures.

Provided are an electrode catalyst layer, a membrane electrode assembly and a polymer electrolyte fuel cell, having sufficient drainage property and gas diffusibility with high power generation performance over a long term. An electrode catalyst layer (10) bonded to a surface of a polymer electrolyte membrane (11) includes at least a catalyst substance (12), a conductive carrier (13), a polymer electrolyte (14) and fibrous substances (15). The number of the fibrous substances (15) in which inclination θ of axes with respect to a surface of the electrode catalyst layer (10) bonded to the surface of the polymer electrolyte membrane (11) is 0°≤θ<45°, among the fibrous substances (15), is greater than 50% of the total number of the fibrous substances (15) contained.