Molecular Engineering of Azobenzene-based Anolytes Towards High-Capacity Aqueous Redox Flow Batteries.,Angewandte Chemie International Edition

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Molecular Engineering of Azobenzene-based Anolytes Towards High-Capacity Aqueous Redox Flow Batteries.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-08-25 , DOI: 10.1002/anie.202009279
Xihong Zu _{1,

2} , Leyuan Zhang ₁ , Yumin Qian ₁ , Changkun Zhang ₁ , Guihua Yu ₁

Affiliation

Aqueous redox flow batteries (RFBs) are promising alternatives for large‐scale energy storage. However, new organic redox‐active molecules with good chemical stability and high solubility are still desired for high‐performance aqueous RFBs due to their low crossover capability and high abundance. We report azobenzene‐based molecules with hydrophilic groups as new active materials for aqueous RFBs by utilizing the reversible redox activity of azo groups. By rationally tailoring the molecular structure of azobenzene, the solubility is favorably improved from near zero to 2 M due to the highly charged asymmetric structure formed in alkaline environment. DFT simulations suggest that the concentrated solution stability can be enhanced by adding hydrotropic agent to form intermolecular hydrogen bonds. The demonstrated RFB exhibits long cycling stability with a capacity retention of 99.95 % per cycle over 500 cycles. It presents a viable chemical design route towards advanced aqueous RFBs.

中文翻译：

面向高容量水性氧化还原液流电池的基于偶氮苯的电解液的分子工程。

水性氧化还原液流电池（RFB）是大规模储能的有前途的替代品。但是，高性能的水性RFB仍需要具有良好化学稳定性和高溶解度的新型有机氧化还原活性分子，因为它们的低穿越能力和高丰度。我们报告了通过利用偶氮基团的可逆氧化还原活性，具有亲水基团的基于偶氮苯的分子作为水性RFB的新活性材料。通过合理地调整偶氮苯的分子结构，由于在碱性环境中形成的带高电荷的不对称结构，溶解度从接近零有利地提高到2M。DFT模拟表明，可以通过添加水溶助剂形成分子间氢键来增强浓溶液的稳定性。演示的RFB表现出长期的循环稳定性，在500个循环中每个循环的容量保持率为99.95％。它为高级水性RFB提出了可行的化学设计路线。

更新日期：2020-08-25

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