A Water-Miscible Quinone Flow Battery with High Volumetric Capacity and Energy Density,ACS Energy Letters

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A Water-Miscible Quinone Flow Battery with High Volumetric Capacity and Energy Density
ACS Energy Letters ( IF 19.3 ) Pub Date : 2019-05-22 00:00:00 , DOI: 10.1021/acsenergylett.9b00739
Shijian Jin ₁ , Yan Jing ₂ , David G. Kwabi ₁ , Yunlong Ji ₂ , Liuchuan Tong ₂ , Diana De Porcellinis ₁ , Marc-Antoni Goulet ₁ , Daniel A. Pollack ₃ , Roy G. Gordon _{1,

2} , Michael J. Aziz ₁

Affiliation

A water-miscible anthraquinone with polyethylene glycol (PEG)-based solubilizing groups is introduced as the redox-active molecule in a negative electrolyte (negolyte) for aqueous redox flow batteries, exhibiting the highest volumetric capacity among aqueous organic negolytes. We synthesized and screened a series of PEG-substituted anthraquinones (PEGAQs) and carefully studied one of its isomers, namely, 1,8-bis(2-(2-(2-hydroxyethoxy)ethoxy)ethoxy)anthracene-9,10-dione (AQ-1,8-3E-OH), which has high electrochemical reversibility and is completely miscible in water of any pH. A negolyte containing 1.5 M AQ-1,8-3E-OH, when paired with a ferrocyanide-based positive electrolyte across an inexpensive, nonfluorinated permselective polymer membrane at pH 7, exhibits an open-circuit potential of 1.0 V, a volumetric capacity of 80.4 Ah/L, and an energy density of 25.2 Wh/L.

中文翻译：

具有高容量和高能量密度的水混溶醌液流电池

将具有聚乙二醇（PEG）基增溶基团的与水混溶的蒽醌作为氧化还原活性分子引入水性氧化还原液流电池的负极电解液（电解质）中，在水性有机还原液中具有最高的体积容量。我们合成并筛选了一系列PEG取代的蒽醌（PEGAQ），并仔细研究了其异构体之一，即1,8-双（2-（2-（2-（2-羟基乙氧基）乙氧基）乙氧基）蒽-9,10-二酮（AQ-1,8-3E-OH），具有很高的电化学可逆性，可以在任何pH的水中完全混溶。含有1.5 M AQ-1,8-3E-OH的正电解质当与基于亚铁氰化物的正电解质在pH值为7的廉价的非氟化渗透选择性聚合物膜上配对时，显示出1.0 V的开路电势，80.4 Ah / L的体积容量和25.2 Wh / L的能量密度。

更新日期：2019-05-22

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