Aqueous redox flow batteries using electroactive organic materials are currently attracting significant attention. However, the influence of supporting electrolytes on the aqueous solubility, electrochemical reversibility and chemical stability of the organic components has rarely been investigated. Here, a new electrolyte design strategy towards enhanced solubility and chemical stability of active materials is proposed by using interaction-mediating species. 3 molality aqueous imidazolium chlorides, with high ionic conductivity and water-like flowability, enable a record aqueous solubility of 4.3 M for a commercially available nitroxyl radical and reversible 2e^- reaction of unmodified methyl viologen at moderate concentrations. With 0.6 M electrolyte, flow cell shows remarkable chemical stability of the nitroxyl radical, excellent cycling stability over 250 cycles at 80 mA cm^-2, and a peak power density of 121.6 mW cm^-2 at 175 mA cm^-2. Furthermore, nitroxyl radical catholyte with a concentration of 3 M is tested in a flow cell. It maintains an impressive steady energy efficiency of 65% at 30 mA cm^-2. This work paves a new way for the development of high performance aqueous electrolytes based on organic materials.

目前，使用电活性有机材料的水性氧化还原液流电池引起了极大的关注。然而，很少研究支持电解质对有机组分的水溶性，电化学可逆性和化学稳定性的影响。在此，通过使用相互作用介导物质，提出了一种新的电解质设计策略，旨在提高活性材料的溶解度和化学稳定性。3摩尔浓度水性咪唑鎓氯化物，具有高离子传导性和水样的流动性，使4.3微米的记录水溶解度为市售的硝酰自由基和可逆2E ^-未修饰的甲基紫精在中等浓度下的反应 用0.6M电解质，以80mA厘米流动硝酰基的细胞显示显着的化学稳定性基团，优异的循环稳定性超过250次循环^-2，和121.6毫瓦厘米的峰值功率密度^-2在175毫安厘米^-2。此外，在流通池中测试了浓度为3 M的亚硝酰自由基阴极电解液。在30 mA cm ^-2时，它保持令人印象深刻的稳定能源效率65％。这项工作为开发基于有机材料的高性能水性电解质铺平了一条新途径。