Highly Stable, Low Redox Potential Quinone for Aqueous Flow Batteries**
Highly Stable, Low Redox Potential Quinone for Aqueous Flow Batteries**
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用于水液电池的高度稳定、低氧化还原电位醌**
DOI：
10.1002/batt.202200009
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发表时间：
2022
影响因子：
5.7
通讯作者：
Aziz, Michael J.
中科院分区：
文献类型：
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作者：
Wu, Min;Bahari, Meisam;Jing, Yan;Amini, Kiana;Fell, Eric M.;George, Thomas Y.;Gordon, Roy G.;Aziz, Michael J.
水性有机氧化还原液流电池是大规模储能的有希望的候选者。然而，稳定且廉价的电解质的设计具有挑战性。在这里，我们报告了一种高度稳定、低氧化还原电位和潜在廉价的电解质物质，3，3 ′，3 ′′，3 ′-（（9，10-蒽醌-2，6-二基）双（氮杂三基））四（丙烷-1-磺酸酯）钠（2，6-N-TSAQ），其由廉价的前体一步合成。将2，6-N-TSAQ与亚铁氰化钾在pH=14下配对产生具有任何蒽醌基电池的最高开路电压1.14 V的电池，容量衰减率<10%/年。 当2，6-N-TSAQ在中性pH下循环时，其表现出高两个数量级的容量衰减速率。根据蒽酮生成反应的热力学解释了蒽醌在不同pH值下循环稳定性的巨大差异。这项工作显示了有机合成化学在开发可行的液流电池电解质方面的巨大潜力，并证明了通过了解分解机制可以实现的显着性能改善。
Aqueous organic redox flow batteries are promising candidates for large‐scale energy storage. However, the design of stable and inexpensive electrolytes is challenging. Here, we report a highly stable, low redox potential, and potentially inexpensive negolyte species, sodium 3,3′,3′′,3′′′‐((9,10‐anthraquinone‐2,6‐diyl)bis(azanetriyl))tetrakis(propane‐1‐sulfonate) (2,6‐N‐TSAQ), which is synthesized in a single step from inexpensive precursors. Pairing 2,6‐N‐TSAQ with potassium ferrocyanide at pH=14 yielded a battery with the highest open‐circuit voltage, 1.14 V, of any anthraquinone‐based cell with a capacity fade rate <10 %/yr. When 2,6‐N‐TSAQ was cycled at neutral pH, it exhibited two orders of magnitude higher capacity fade rate. The great difference in anthraquinone cycling stability at different pH is interpreted in terms of the thermodynamics of the anthrone formation reaction. This work shows the great potential of organic synthetic chemistry for the development of viable flow battery electrolytes and demonstrates the remarkable performance improvements achievable with an understanding of decomposition mechanisms.