Aqueous organic redox flow batteries (AORFBs) hold great promise as low-cost, environmentally friendly and safe alternative energy storage media. Here we present aqueous organometallic and all-organic active materials for RFBs with a water-soluble active material, sulfonated tryptanthrin (TRYP-SO₃H), working at a neutral pH and showing long-term stability. Electrochemical measurements show that TRYP-SO₃H displays reversible peaks at neutral pH values, allowing its use as an anolyte combined with potassium ferrocyanide or 4,5-dihydroxy-1,3-benzenedisulfonic acid disodium salt monohydrate as catholytes. Single cell tests show reproducible charge-discharge cycles for both catholytes, with significantly improved results for the aqueous all-organic RFB reaching high cell voltage (0.94 V) and high energy efficiencies, stabilized during at least 50 working cycles.

水系有机氧化还原液流电池 (AORFB) 作为低成本、环保且安全的替代储能介质具有广阔的前景。在这里，我们展示了用于 RFB 的水性有机金属和全有机活性材料，水溶性活性材料磺化色胺菊酯 (TRYP-SO ₃ H)，在中性 pH 值下工作并显示出长期稳定性。电化学测量表明，TRYP-SO ₃H 在中性 pH 值下显示可逆峰，使其可以用作阳极电解液，与亚铁氰化钾或 4,5-二羟基-1,3-苯二磺酸二钠盐一水合物作为阴极电解液结合使用。单电池测试显示两种阴极电解液的可重复充放电循环，水性全有机 RFB 的结果显着改善，达到高电池电压 (0.94 V) 和高能量效率，在至少 50 个工作循环中稳定。