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Formation and detection of 2,6-dihydroxyanthrone (DHA) Fig. S2a depicts results of a symmetric cell cycling experiment that began with a strong discharging (oxidation) overpotential of +350 mV, initially accessing > 99% of the theoretical DHAQ capacity. Near day 0.5 of cycling, the oxidation overpotential was lowered to +200 mV, leading to a sudden drop in capacity. Cycling was continued with this oxidative overpotential for several days, and aliquots were taken periodically in the discharged state for 1H NMR spectroscopy. The presence and increasing intensity of new peaks in the NMR spectrum indicates the accumulation of another chemical species besides DHAQ. a 100 98 96 94 92 90 88 86 b 0.0 1.0 0.35 V 0.20 V 0.5 Time (days) Figure S2. (a) Symmetric cell cycling of 0.1 M DHAQ in a 1.2 M KOH solution, showing change in capacity and fade rate when oxidation overpotential is changed from +350 to +200 mV. (b) Continued cycling at +200 mV oxidation overpotential leads to broadening of DHAQ peaks and to the appearance of additional peaks of increasing intensity in the 1H NMR spectrum in D2O. (Bottom spectrum is DHAQ, middle spectrum is electrolyte cycled for 1 day, top spectrum is electrolyte cycled for 5 days). 4 Capacity (%)PDF Image | Extending organic flow batteries via redox state management
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