We demonstrated that by regulating the flow rate of the electrolyte, the surface pH can be controlled and the coulombic efficiency values can be optimized. . Here, we report on a membraneless single-flow zinc–bromine battery leveraging a unique multiphase electrolyte. The use of such electrolyte emulsions, containing a bromine-poor aqueous phase and bromine-rich polybromide phase, have allowed for effective reactant separation in single-flow. . Abstract: The all-iron redox flow battery is an attractive, eco-friendly and inexpensive solution for large-scale energy storage because of the favorable earth abundance of iron-based materials.
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