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Cycling of DHAQ under aerobic conditions As described in the main text, DHAQ capacity recovery can be achieved by aeration of the electrolyte. Alternatively, this strategy could be achieved by operation of the flow battery in an open-air environment, which also achieves a lower capacity fade rate and is demonstrated in Fig. S24. In this case, the ‘protective’ effect of oxygen may be due to the aeration of DHA and recovery of DHAQ, as previously demonstrated, but may also be due to the oxidation of DHAHQ, which would decrease the accessed SOC and, correspondingly, the driving force for DHA formation. In either case, this method comes at a performance cost because it engenders a loss of current efficiency due to the continuous oxidation of the negolyte. For this reason, the method of aeration after discharge demonstrated in Fig. 4 is preferable and could be achieved most effectively in an industrial application by adding an oxygen treatment step after each discharge of the electrolyte. Figure S24. K4[Fe(CN)6] Potentiostatic full cell cycling of 0.1 M DHAQ in a 1.2 M KOH solution vs 0.05 M in a nitrogen atmosphere (fade rate = 2.8%/day) for 1 day, followed by an intermittent nitrogen atmosphere for 2 days due to dewar replacement, and then an ambient air environment (fade rate = 0.75%/day) for the final 3 days. 26PDF Image | Extending organic flow batteries via redox state management
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