Issue 10, 2022

Structural alterations on the TEMPO scaffold and their impact on the performance as active materials for redox flow batteries

Abstract

Trimethylammonium-2,2,6,6-tetramethylpiperidine-1-oxyl chloride (TMA-TEMPO) has been intensively studied for its usage in aqueous organic redox flow batteries. Straightforward synthesis, reliable electrochemistry, fast kinetics and high cycling stability are the advantages of this active material. Nevertheless, it has been shown that elevated temperatures and high states of charge accelerate the decomposition of this material. Hence, a comparative study was performed with five new and one known TEMPO derivatives, to elucidate the structure–stability relationship of the TEMPO scaffold and to investigate the influence on the battery performance. The results show that the introduction of linkers between the solubility-promoting group and the piperidyl core or enhanced shielding of the radical has a great impact on the stability during cycling.

Graphical abstract: Structural alterations on the TEMPO scaffold and their impact on the performance as active materials for redox flow batteries

Supplementary files

Article information

Article type
Paper
Submitted
29 Jul 2021
Accepted
21 Mar 2022
First published
26 Mar 2022
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2022,3, 4278-4288

Structural alterations on the TEMPO scaffold and their impact on the performance as active materials for redox flow batteries

P. Rohland, O. Nolte, K. Schreyer, H. Görls, M. D. Hager and U. S. Schubert, Mater. Adv., 2022, 3, 4278 DOI: 10.1039/D1MA00663K

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