Redox flow batteries (RFBs) represent a promising technology for stationary energy storage for various applications such as peak shaving, back-up sources, frequency regulation etc. The flow concept enables to decouple the power from capacity and thus to tailor the properties of the storage according to the customer’s needs. The energy conversion takes place in battery stack and it is realized solely via oxidation or reduction of dissolved electroactive species on inert porous electrodes. The absence of phase changes (metal plating, gas evolution) within the battery operation result in high cycle efficiency, prolonged durability and simplified electrode construction comparing to conventional accumulators and fuel cells. Beside the traditionally used metal ions (V, Fe, Cr, Ti and others), the RFBs based on organic electroactive species have recently attracted the attention of RFB developers[1]. The organic molecules of the quinone group are intensively studied as they can be synthesized in huge quantities and low costs. In the same time they generally offer high electrochemical reversibility and their relevant physical properties (solubility, reduction potential) can be tuned by functionalization of the quinone backbone by virtualy countless number of substituents[2].
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