Anthraquinone Derivatives in Aqueous Flow Batteries

TitleAnthraquinone Derivatives in Aqueous Flow Batteries
Publication TypeJournal Article
Year of Publication2017
AuthorsGerhardt, MR, Tong, L, Gómez-Bombarelli, R, Chen, Q, Marshak, MP, Galvin, CJ, Aspuru-Guzik, A, Gordon, RG, Aziz, MJ
JournalAdvanced Energy Materials
Date Published2017/04/19/
ISBN Number1614-6832
Keywordsanthraquinones, electrochemistry, energy storage, energy-storage, organic molecules, power-density, redox couples, redox flow batteries

Anthraquinone derivatives are being considered for large scale energy storage applications because of their chemical tunability and rapid redox kinetics. The authors investigate four anthraquinone derivatives as negative electrolyte candidates for an aqueous quinone-bromide redox flow battery: anthraquinone-2-sulfonic acid (AQS), 1,8-dihydroxyanthraquinone-2,7-disulfonic acid (DHAQDS), alizarin red S (ARS), and 1,4-dihydroxyanthraquinone-2,3-dimethylsulfonic acid (DHAQDMS). The standard reduction potentials are all lower than that of anthraquinone-2,7-disulfonic acid (AQDS), the molecule used in previous quinone-bromide batteries. DHAQDS and ARS undergo irreversible reactions on contact with bromine, which precludes their use against bromine but not necessarily against other electrolytes. DHAQDMS is apparently unreactive with bromine but cannot be reversibly reduced, whereas AQS is stable against bromine and stable upon reduction. The authors demonstrate an AQS-bromide flow cell with higher open circuit potential and peak galvanic power density than the equivalent AQDS-bromide cell. This study demonstrates the use of chemical synthesis to tailor organic molecules for improving flow battery performance.

Short TitleAdv. Energy Mater.