Today, ionic liquids are more and more present in many fields and more particularly in electrochemistry. Indeed, their physical and chemical properties are appealing and attractive. They are conductive solvents in which organic and inorganic salts can be dissolved depending on the nature of the anion and cation that make up the ionic liquid. However, only very few studies have reported their use in membraneless redox flow batteries (RFBs) for the storage of renewable energy. The concept of membraneless redox-flow batteries was first reported by Ferrigno et al. in 2002, with the development of a millimeter-scale redox fuel cell based on the vanadium aqueous electrolyte solutions.
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