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Figure 8. AQ-based derivatives and the performance for AORFBs[52,53]. (A) Synthesis of AQDS-(NH4)2; (B) Synthesis of PEGn-AQ (n = 3, 12, 45). Reproduced with permission[52]. Copyright 2019, Wiley-VCH. (C) Schematic hydrogen bonding interactions proposed for AQDS(NH4)2; (D) CV curves for AQDS(NH4)2 and NH4I, respectively; (E) Capacity versus cycle number for 300 cycles of 0.75 M AQDS(NH4)2/NH4I AORFB. Current density: 60 mA cm-2. Inset: selected representative voltage versus capacity profiles; (F) CV curves of PEG12-AQ (red) and K4Fe(CN)6 (blue). Conditions: 5 mM of each electrolyte in 0.5 M KCl. The dotted line was the CV curve for blank KCl. Scan rate: 50 mV s-1; (G) Discharge capacity and CE of the PEG12-AQ (0.35 M)/K4Fe(CN)6 battery over 180 cycles. Current density: 60 mA cm-2; (H) The scheme shows EG’s role in increasing the solubility of 2,7-AQDS in an aqueous solution; (I) UV-Vis results of 2,7-AQDS dissolved in 1 M KCl with and without EG additive; (J) Discharge capacity graphs of two different AORFBs. The first AORFB used 0.3 M potassium ferrocyanide and 0.1 M 2,7-AQDS without additive at room temperature, while the second one used 1.2 M ferrocyanide containing the sodium and potassium salts of 1:1 ratio and 0.4 M 2,7-AQDS. In the second AORFB, 10 mL of 1 M EG additive was included to enhance the solubility of 2,7-AQDS in KCl. Reproduced with permission[54]. Copyright 2020, Wiley-VCH.
