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Redox Flow Batteries Vanadium to Earth Quinones

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Redox Flow Batteries Vanadium to Earth Quinones ( redox-flow-batteries-vanadium-earth-quinones )

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Electrodes Cell Membrane Pumps Figure 7.1 - Schematic of Organic Redox Flow Battery (ORFB). The development of a so-called all-organic equivalent to VRFB with a bipolar redox- active material is of high interest, because this material would be able to undergo oxidation, as well as reduction reactions and could, therefore, be applied as both the cathode and anode active material. This feature would reduce the synthesis effort of the whole process and potentially overcome the problem of cross- contamination, since a slow mixing of the electrolytes would only lead to a reduced Coulombic efficiency but not to a continuously decreasing charge/discharge capacity251, as the same molecule can be either reduced or oxidized. Organic molecules are also abundant, tunable by synthetic pathways and an improved kinetic with the possibility of having two-electron transfer process (as happens to quinones)1,2. Such a battery has the potential to meet the demanding cost, durability, eco-friendliness, and sustainability requirements for grid-scale electrical energy storage. 151 Catholyte Anolyte

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