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Here we present aqueous organometallic and all-organic active materials for RFBs with a water-soluble active material, sulfonated tryptanthrin (TRYP-SO<jats:sub>3<\/jats:sub>H), working at a neutral pH and showing long-term stability. Electrochemical measurements show that TRYP-SO<jats:sub>3<\/jats:sub>H 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\u2009V) and high energy efficiencies, stabilized during at least 50 working cycles.<\/jats:p>","DOI":"10.1038\/s42004-021-00523-0","type":"journal-article","created":{"date-parts":[[2021,6,11]],"date-time":"2021-06-11T10:08:03Z","timestamp":1623406083000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Sulfonated tryptanthrin anolyte increases performance in pH neutral aqueous redox flow batteries"],"prefix":"10.1038","volume":"4","author":[{"given":"Daniela","family":"Pinheiro","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7460-3758","authenticated-orcid":false,"given":"Marta","family":"Pineiro","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9708-5079","authenticated-orcid":false,"given":"J. 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