A redox-flow battery with an alloxazine-based organic electrolyte

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A redox-flow battery with an alloxazine-based organic electrolyte

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Title: A redox-flow battery with an alloxazine-based organic electrolyte
Author: Lin, Kaixiang; Gómez-Bombarelli, Rafael; Beh, Eugene; Tong, Liuchuan; Chen, Qing; Valle, Alvaro West; Aspuru-Guzik, Alan; Aziz, Michael J.; Gordon, Roy Gerald

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Citation: Lin, Kaixiang, Rafael Gómez-Bombarelli, Eugene S. Beh, Liuchuan Tong, Qing Chen, Alvaro Valle, Alán Aspuru-Guzik, Michael J. Aziz, and Roy G. Gordon. 2016. “A Redox-Flow Battery with an Alloxazine-Based Organic Electrolyte.” Nature Energy 1 (9) (July 18): 16102. doi:10.1038/nenergy.2016.102.
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Abstract: Redox-flow batteries (RFBs) can store large amounts of electrical energy from variable sources, such as solar and wind. Recently, redox-active organic molecules in aqueous RFBs have drawn substantial attention due to their rapid kinetics and low membrane crossover rates. Drawing inspiration from nature, here we report a high-performance aqueous RFB utilizing an organic redox compound, alloxazine, which is a tautomer of the isoalloxazine backbone of vitamin B2. It can be synthesized in high yield at room temperature by single-step coupling of inexpensive o-phenylenediamine derivatives and alloxan. The highly alkaline-soluble alloxazine 7/8-carboxylic acid produces a RFB exhibiting open-circuit voltage approaching 1.2 V and current efficiency and capacity retention exceeding 99.7% and 99.98% per cycle, respectively. Theoretical studies indicate that structural modification of alloxazine with electron-donating groups should allow further increases in battery voltage. As an aza-aromatic molecule that undergoes reversible redox cycling in aqueous electrolyte, alloxazine represents a class of radical-free redox-active organics for use in large-scale energy storage.
Published Version: 10.1038/nenergy.2016.102
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:33439113
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