A pH-Neutral, Metal-Free Aqueous Organic Redox Flow Battery Employing an Ammonium Anthraquinone Anolyte

Angewandte Chemie
Bo HuTianbiao Leo Liu

Abstract

Redox-active anthraquinone molecules represent promising anolyte materials in aqueous organic redox flow batteries (AORFBs). However, the chemical stability issue and corrosion nature of anthraquinone-based anolytes in reported acidic and alkaline AORFBs constitute a roadblock for their practical applications in energy storage. A feasible strategy to overcome these issues is migrating to pH-neutral conditions and employing soluble AQDS salts. Herein, we report the 9,10-anthraquinone-2,7-disulfonic diammonium salt AQDS(NH4 )2 , as an anolyte material for pH-neutral AORFBs with solubility of 1.9 m in water, which is more than 3 times that of the corresponding sodium salt. Paired with an NH4 I catholyte, the resulting pH-neutral AORFB with an energy density of 12.5 Wh L-1 displayed outstanding cycling stability over 300 cycles. Even at the pH-neutral condition, the AQDS(NH4 )2  /NH4 I AORFB delivered an impressive energy efficiency of 70.6 % at 60 mA cm-2 and a high power density of 91.5 mW cm-2 at 100 % SOC. The present AQDS(NH4 )2 flow battery chemistry opens a new avenue to apply anthraquinone molecules in developing low-cost and benign pH-neutral flow batteries for scalable energy storage.

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Apr 5, 2019·Chemical Communications : Chem Comm·Wanqiu LiuXianfeng Li

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Citations

Jul 9, 2020·Advanced Materials·Yusran YusranValentin Valtchev
Apr 25, 2020·Angewandte Chemie·Jianhang HuangYonggang Wang
May 1, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Petr MazúrJuraj Kosek
Mar 10, 2020·ACS Applied Materials & Interfaces·Jingchao ChaiJianbing Jimmy Jiang
Feb 14, 2020·Chemical Reviews·David G KwabiMichael J Aziz

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