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Oxidation of DHA A sample of cycled DHAQ electrolyte, also utilized in the experiment of which results are depicted in Fig. S2b, was discharged at +200 mV overpotential; the 1H NMR spectrum revealed peaks matching those of DHA and broad peaks matching those of DHAQ (Fig. S6a, bottom spectrum). When the same electrolyte was discharged at +350 mV, the 1H NMR spectrum revealed sharp (rather than broad) peaks matching those of DHAQ and peaks later confirmed to match those of (DHA)2 but no peaks matching those of DHA (Fig. S6a, top spectrum). When a sample of synthetic DHA was chemically oxidized by aeration, the 1H NMR spectrum indicates that most of the DHA was converted to DHAQ and a smaller amount was converted to (DHA)2 (Fig. S6b). Figure S6. 1H NMR spectra (500 MHz, D2O) of (a) a sample of cycled DHAQ electrolyte discharged at +200 mV oxidation overpotential (bottom spectrum) and at +350 mV oxidation overpotential (top spectrum) and (b) a sample of synthetic DHA before aeration (bottom spectrum) and after aeration (top spectrum). a b 8PDF Image | Extending organic flow batteries via redox state management
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