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Sulfonated tryptanthrin anolyte increases performance in pH neutral aqueous redox flow batteries.

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.

SUBMITTER: Pinheiro D

PROVIDER: S-EPMC9814137 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature

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Sulfonated tryptanthrin anolyte increases performance in pH neutral aqueous redox flow batteries.

Pinheiro Daniela D Pineiro Marta M de Melo J Sérgio Seixas JSS

Communications chemistry 20210611 1

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-SO<sub>3</sub>H), working at a neutral pH and showing long-term stability. Electrochemical measurements show that TRYP-SO<sub>3</sub>H displays reversible peaks at neutral pH values, allowing its use as an ...[more]

PMID: 36697575

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