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Issue 15, 2018
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Substituted thiadiazoles as energy-rich anolytes for nonaqueous redox flow cells

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Abstract

Understanding structure–property relationships is essential for designing energy-rich redox active organic molecules (ROMs) for all-organic redox flow batteries. Herein we examine thiadiazole ROMs for storage of negative charge in the flow cells. These versatile molecules have excellent solubility and low redox potentials, allowing high energy density to be achieved. By systematically incorporating groups with varying electron accepting/withdrawing ability, we have examined substituent effects on their properties of interest, including redox potentials, calendar lives of charged ROMs in electrolyte, and the flow cell cycling performance. While the calendar life of energized fluids can be tuned in a predictable fashion over a wide range, the improvements in the calendar life do not automatically translate into the enhanced cycling performance, indicating that in addition to the slow reactions of charged species in the solvent bulk, there are other parasitic reactions that occur only during the electrochemical cycling of the cell and can dramatically affect the cycling lifetime.

Graphical abstract: Substituted thiadiazoles as energy-rich anolytes for nonaqueous redox flow cells

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Supplementary files

Article information


Submitted
31 Jan 2018
Accepted
13 Mar 2018
First published
13 Mar 2018

J. Mater. Chem. A, 2018,6, 6251-6254
Article type
Communication
Author version available

Substituted thiadiazoles as energy-rich anolytes for nonaqueous redox flow cells

J. Huang, W. Duan, J. Zhang, I. A. Shkrob, R. S. Assary, B. Pan, C. Liao, Z. Zhang, X. Wei and L. Zhang, J. Mater. Chem. A, 2018, 6, 6251
DOI: 10.1039/C8TA01059E

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