The team designed a bromine-related reaction that transfers two electrons instead of one and successfully applied it to a zinc-bromine flow battery. Capturing. . A new advance in bromine-based flow batteries could remove one of the biggest obstacles to long-lasting, affordable energy storage. It's abundant, relatively. . actions between zinc and bromine. However,practical applications of this technology are hindered by low power density and short cycle life,mainly due to large polarizatio flow system. . Bromine-based redox flow batteries (Br-FBs) have emerged as a technology for large-scale energy storage, offering notable advantages such as high energy density, a broad electrochemical potential window, cost-effectiveness, and extended cycle life. Zinc has long been used as the negative electrode of primary cells.