Abstract
The development of highly water-soluble quinone derivatives is an important research direction for aqueous organic redox flow batteries (AORFBs) of high energy density. In this work, choline cations are substituted for sodium ions to form new ion pairs with quinone sulfonates, and the water solubility of quinone sulfonates derivatives is significantly improved due to the formed interionic hydrogen bond between the CO in anthraquinone sulfonic acid anion and -OH in choline cation. Specifically, 9,10-anthraquinone-2-disulfonic choline salt (AQSCH) and 1, 2-dihydroxy-3, 5-phenyldisulfonic acid dicholine salt (BQDS(CH)2) are synthesized by simple ion exchange and acid-base neutralization. As a result, the solubility of the quinone and anthraquinone sulfonates in water is increased by more than ten times, and the redox reversibility is not significantly affected. The charging-discharging performance of a novel pH-neutral all-quinone aqueous battery with AQSCH and BQDS(CH)2 as the anodic and cathodic active electrolytes respectively, choline chloride as the supporting electrolyte is investigated using a static H-type electrolytic cell, the obtained results verifying the feasibility of using choline as the counter cathion and solubilizer of quinone sulfonates to improve their water solubility in pH-neutral AORFBs.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
