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Issue 18, 2020
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Desymmetrized hexasubstituted [3]radialene anions as aqueous organic catholytes for redox flow batteries

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Abstract

Negatively substituted trimethylenecyclopropane dianions, a subclass of hexasubstituted [3]radialenes, are candidates for use as active species in redox flow batteries (RFBs) due to their stability in water, reversible electrochemistry, and tailorable synthesis. Hexacyano[3]radialene disodium is investigated as a pH 7 aqueous organic catholyte. The dianion and radical anion are stable in air and aqueous solutions at neutral pH. Systematic introduction of asymmetry via step-wise synthesis leads to enhanced solubility and higher capacity retention during galvanostatic cycling. An aqueous flow cell comprising a diester-tetracyano[3]radialene catholyte, sulfonated-methyl viologen as the anolyte, and a cation exchange membrane provides an operating Vcell = 0.9 V, 99.609% coulombic efficiency, and minimum capacity fade over 50 cycles.

Graphical abstract: Desymmetrized hexasubstituted [3]radialene anions as aqueous organic catholytes for redox flow batteries

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Supplementary files

Article information


Submitted
01 Nov 2019
Accepted
27 Jan 2020
First published
28 Jan 2020

Chem. Commun., 2020,56, 2739-2742
Article type
Communication

Desymmetrized hexasubstituted [3]radialene anions as aqueous organic catholytes for redox flow batteries

N. A. Turner, M. B. Freeman, H. D. Pratt, A. E. Crockett, D. S. Jones, M. R. Anstey, T. M. Anderson and C. M. Bejger, Chem. Commun., 2020, 56, 2739
DOI: 10.1039/C9CC08547E

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