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Although all\u2010vanadium RFBs exhibit long lifetimes, the cost of vanadium resources fluctuates considerably, and is generally expensive. Iron\u2013chromium RFBs take advantage of utilizing a low\u2010cost and large abundance of iron and chromite ore; however, the redox chemistry of Cr<jats:sup>II\/III<\/jats:sup> generally involves strong Jahn\u2013Teller effects. Herein, this work introduces a new Cr\u2010based negolyte coordinated with strong\u2010field ligands capable of mitigating strong Jahn\u2013Teller effects, thereby facilitating low redox potential, high stability, and rapid kinetics. The balanced full\u2010cell configuration features a stable lifetime of 500 cycles with energy density of 14\u00a0Wh L<jats:sup>\u22121<\/jats:sup>. With an excessive posolyte, the full\u2010cell can attain a high energy density of 38.6\u00a0Wh L<jats:sup>\u22121<\/jats:sup> as a single electron redox process. Consequently, the proposed system opens new avenues for the development of high\u2010performance RFBs.<\/jats:p>","DOI":"10.1002\/aenm.202300707","type":"journal-article","created":{"date-parts":[[2023,7,7]],"date-time":"2023-07-07T03:28:33Z","timestamp":1688700513000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":46,"title":["Full\u2010Hexacyanometallate Aqueous Redox Flow Batteries Exceeding 1.5\u00a0V in an Aqueous Solution"],"prefix":"10.1002","volume":"13","author":[{"given":"Ji\u2010Eun","family":"Jang","sequence":"first","affiliation":[{"name":"School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST)  Ulsan 44919 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryeong\u2010ah","family":"Kim","sequence":"additional","affiliation":[{"name":"School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST)  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