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Title: Sulfonated tryptanthrin anolyte increases performance in pH neutral aqueous redox flow batteries
Authors: Pinheiro, Daniela 
Piñeiro, Marta 
Melo, J. Sérgio Seixas de 
Issue Date: 2021
Project: Projects “Hylight” (No. 031625) 02/SAICT/2017, PTDC/QUI-QFI/31625/2017 
Project “SunStorage - Harvesting and storage of solar energy”,reference POCI-01-0145-FEDER-016387 
FCT Ph.D. grant to D.P. (ref SFRH/BD/74351/2010) 
Project “SunStorage—Harvesting and storage of solar energy” - research grant 
Serial title, monograph or event: Communications Chemistry
Volume: 4
Issue: 1
Abstract: 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.
ISSN: 2399-3669
DOI: 10.1038/s42004-021-00523-0
Rights: openAccess
Appears in Collections:I&D CQC - Artigos em Revistas Internacionais

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