Alkaline exchange membranes (AEMs), also called anion exchange membranes, allow transportation of anions (ex: OH-, Cl-, Br-, etc.) from the cathode to the anode in electrochemical reaction. AEMs are the most critical component of AEM fuel cells, water electrolysis, and certain batteries, sensors, and actuators. Many AEM materials tend to degrade easily under high alkaline. This technology comprises new chemical structures composed of styrene-butadiene block copolymer functionalized with quaternized ammonium groups toovercomes this alkaline stability issue.
This technology relates to anion exchange membranes with enhanced stability to high pH environments including poly(arylene sulfone) or poly(arylene ketone) with anion exchange groups. Membranes according to this technology are simple to produce and have good mechanical properties, improved alkaline stability, as well as good anionic conductivity. This technology is particularly effective in fuel cell applications.