Development of Anion Exchange Membrane for Alkaline Fuel Cells and Redox Flow Batteries

Renewable energy integration into the power grid has prioritized large-scale energy storage. Electrochemical energy conversion and storage systems increasingly employ anion-exchange membranes, notably alkaline anion forms, and redox flow batteries for medium to large-scale power storage. AEMs may exchange anions and covalently bound cations such as quaternary ammonium. However, redox flow batteries are too expensive for widespread use. Redox flow batteries' performance and profitability depend on the membrane. Despite electricity traveling across the membrane dividing positive and negative electrolytes, ions complete the circuit. Ideally, membranes have strong ionic conductivity, low water input, and chemical and thermal stability. Also crucial is ionic exchange. Many groups worldwide have spent years building an inexpensive, chemically stable redox flow cell battery membrane. Eco-friendly zinc-iron redox flow batteries employ an anion exchange membrane that fulfills these requirements.