Described herein are cationic polymers having a plurality of quaternary amino groups, methods of making such polymers, and uses of such polymers as ion exchange membranes in electrochemical devices.

A bipolar membrane BP characterized in that particles 5 of a basic metal chloride are distributed in the interface between a cation-exchange membrane 1 and an anion-exchange membrane 3.

A proton-exchange membrane includes a polymer matrix, polymer fibers, or a combination thereof. The proton-exchange membrane also includes a proton-conducting material distributed on the polymer matrix, on the polymer fibers, in the polymer fibers, or a combination thereof.

A multi-catalytic material that includes a polyelectrolyte membrane and methods of preparing the same are provided herein.

A desalination device includes a container, first and second electrodes, an anion exchange membrane (AEM), and a power source. The container contains saline water that has an elevated concentration of dissolved salts. The AEM separates the container into first and second compartments into which the first and second electrodes, respectively, are arranged. The AEM has a continuous porous structure and a plurality of negatively-charged oxygen functional groups coupled to the porous structure. The power source is configured to selectively apply a voltage to one of the first and second electrodes. The AEM has a selective permeability when the voltage is applied such that cations in the saline water solution have a first diffusion rate d.sub.1 therethrough and anions in the saline water solution have a second diffusion rate d.sub.2 therethrough. The first diffusion rate d.sub.1 is less than the second diffusion rate d.sub.2 and greater than or equal to zero.

A release layer of a release film for producing a membrane electrode assembly of a polymer electrolyte fuel cell comprises a cyclic olefin polymer comprising an olefin unit having a C.sub.3-10alkyl group as a side chain thereof. The release layer may have a glass transition temperature of about 210 to 350 C. The release layer may have a transition point of a dynamic storage modulus E in a range from 50 to 100 C. An ion exchange layer comprising an ion exchange polymer may be laminated on the release layer of the release film by a roll-to-roll processing to produce a laminate. The release film may be separated from the laminate to give the membrane electrode assembly. The release film achieves improved production of a membrane electrode assembly (an electrolyte membrane and/or an electrode membrane) of a polymer electrolyte fuel cell.

Disclosed embodiments are related to mitigating leaks in membranes and/or improving the selectivity of membranes.

A proton-exchange membrane includes a polymer matrix, polymer fibers, or a combination thereof. The proton-exchange membrane also includes a proton-conducting material distributed on the polymer matrix, on the polymer fibers, in the polymer fibers, or a combination thereof.

The present invention relates to an ion exchanging membrane, a method for manufacturing the same, and an energy storage system comprising the same. The ion exchanging membrane includes a porous support including a plurality of pores, a first ion conducting material located on one surface of the porous support, and a second ion conducting material located on the other surface of the porous support, in which the first ion conducting material and the second ion conducting material are polymers including hydrophilic repeating units and hydrophobic repeating units, and the first ion conducting material and the second ion conducting material have different molar ratios of the hydrophilic repeating units and the hydrophobic repeating units.

According to the ion exchanging membrane, it is possible to improve overall efficiency of the energy storage system by improving both performance efficiency and voltage efficiency of the energy storage system due to excellent ion-conductivity performance and reduced membrane resistance and ensure durability of the energy storage system by having excellent morphological stability and reducing a crossover of vanadium ions.

The present invention relates to a coated ion exchange substrate suitable for use in chromatography medium and methods of making thereof.