Energy Storage Science and Technology ›› 2021, Vol. 10 ›› Issue (4): 1317-1324.doi: 10.19799/j.cnki.2095-4239.2021.0025

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Synthesis of anolyte based on alkyl sulfonate anthraquinone and its application in flow batteries

Teng LYU1(), Zixiang YE1, Jing LI1, Fuqiang CHU1, Bencai LIN1,2()   

  1. 1.School of Materials Science and Engineering, Changzhou University
    2.Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
  • Received:2021-01-15 Revised:2021-03-03 Online:2021-07-05 Published:2021-06-25
  • Contact: Bencai LIN E-mail:2972403627@qq.com;linbencai@cczu.edu.cn

Abstract:

In this study, three types of alkyl sulfonate anthraquinones, (1-hydroxy-2-oxopropane sulfonic acid anthraquinone (1,2-AQPSH2), 2,6-dioxopropane sulfonic acid anthraquinone (2,6-AQDPSH2), and 1-hydroxy-2-oxopropane sulfonic acid anthraquinone (1,4-AQPSH2), were synthesized using propane sultone from 1,2-dihydroxyanthraquinone, 2,6-dihydroxyanthraquinone and 1,4-dihydroxyanthracene, respectively. Solubility and the oxidation-reduction properties of these three anthraquinones in 1 mol/L NaCl aqueous solution under neutral conditions were studied in detail. 1,4-AQPSH2 was selected and used as an anodolyte, 2,2,6,6-tetramethylpiperidinol (4-OH-TEMPO) was used as a catholyte, and Nafion 212 was used as an ion-exchange membrane to assemble a neutral water-based organic redox flow battery cell. Open circuit voltage of the flow battery was about 1.0 V; at a current density of 60 mA·cm-2, the Coulombic efficiency, energy efficiency, and voltage efficiency of the cell were 97%, 68%, and 69%, respectively. At a current density of 60 mA·cm-2, there was no substantial reduction in the discharge capacity of the battery after 75 charging and discharging cycles. These results demonstrate that 1,4-AQPSH2 shows promise as an anolyte for neutral water-based organic redox flow batteries.

Key words: flow batteries, anthraquinone, propane sultone, solubility, anolyte

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