Disclosed are a polymer electrolyte membrane having both high ion conductivity and excellent chemical durability, a manufacturing method therefor, and an electrochemical device comprising same. The polymer electrolyte membrane of the present invention comprises an electrolyte composition, the electrolyte composition containing: an ion conductor; and a radical scavenger, wherein the radical scavenger comprises an organic cyclic compound having at least one functional group selected from the group consisting of a hydroxyl group (—OH), an amine group (—NH.sub.2), a carboxyl group (—COOH), and an amide group (—CONH.sub.2).

A proton exchange solid support includes a porous polymer network including a polymer. The polymer includes a tetravalent boron-based acid group in a side chain of the polymer, and the tetravalent boron-based acid group includes a boron atom having a negative formal charge. A cation is ionically linked to the boron atom.

An electrode assembly and a method of making an electrode assembly. One embodiment of the method includes coating an ionomer solution onto a catalyst coated diffusion media to form a wet ionomer layer, and applying a porous reinforcement layer to the wet ionomer layer such that the wet ionomer layer at least partially impregnates the reinforcement layer. Drying the wet ionomer layer with the impregnated reinforcement layer and joining it to the catalyst coated diffusion media forms an assembly that includes an integrally-reinforced proton exchange membrane layer. This layer may be additionally joined to other ionomer layers and other catalyst coated diffusion media such that a membrane electrode assembly is formed.

An electrode assembly and a method of making an electrode assembly. One embodiment of the method includes coating an ionomer solution onto a catalyst coated diffusion media to form a wet ionomer layer, and applying a porous reinforcement layer to the wet ionomer layer such that the wet ionomer layer at least partially impregnates the reinforcement layer. Drying the wet ionomer layer with the impregnated reinforcement layer and joining it to the catalyst coated diffusion media forms an assembly that includes an integrally-reinforced proton exchange membrane layer. This layer may be additionally joined to other ionomer layers and other catalyst coated diffusion media such that a membrane electrode assembly is formed.

A proton exchange membrane and a membrane electrode assembly for an electrochemical cell such as a fuel cell are provided. A catalytically active component is disposed within the membrane electrode assembly. The catalytically active component comprises particles containing a metal oxide such as silica, metal or metalloid ions such as ions that include boron, and a catalyst. A process for increasing peroxide radical resistance in a membrane electrode is also provided that includes the introduction of the catalytically active component described into a membrane electrode assembly.

A proton exchange membrane and a membrane electrode assembly for an electrochemical cell such as a fuel cell are provided. A catalytically active component is disposed within the membrane electrode assembly. The catalytically active component comprises particles containing a metal oxide such as silica, metal or metalloid ions such as ions that include boron, and a catalyst. A process for increasing peroxide radical resistance in a membrane electrode is also provided that includes the introduction of the catalytically active component described into a membrane electrode assembly.

A composition for filling an ion exchange membrane, a method of preparing the ion exchange membrane, the filled ion exchange membrane, and a redox flow battery using the filled ion exchange membrane. The composition includes an ion conductive material and a water soluble support.

A composition for filling an ion exchange membrane, a method of preparing the ion exchange membrane, the filled ion exchange membrane, and a redox flow battery using the filled ion exchange membrane. The composition includes an ion conductive material and a water soluble support.

A fuel cell, a reinforced membrane electrode assembly and a method of fabricating a reinforced membrane electrode assembly. The method comprises depositing an electrode ink onto a first substrate to form a first electrode layer, applying a first porous reinforcement layer on a surface of the first electrode layer to form a first catalyst coated substrate, depositing a first ionomer solution onto the first catalyst coated substrate to form a first ionomer layer, and applying a membrane porous reinforcement layer on a surface of the first ionomer layer to form a reinforced membrane layer.

A fuel cell, a reinforced membrane electrode assembly and a method of fabricating a reinforced membrane electrode assembly. The method comprises depositing an electrode ink onto a first substrate to form a first electrode layer, applying a first porous reinforcement layer on a surface of the first electrode layer to form a first catalyst coated substrate, depositing a first ionomer solution onto the first catalyst coated substrate to form a first ionomer layer, and applying a membrane porous reinforcement layer on a surface of the first ionomer layer to form a reinforced membrane layer.