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    Rights statement: This is the author’s version of a work that was accepted for publication in Journal of Electroanalytical Chemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Electroanalytical Chemistry, 872, 2020 DOI: 10.1016/j.jelechem.2020.114241

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Characterisation of the ferrocene/ferrocenium ion redox couple as a model chemistry for non-aqueous redox flow battery research

Research output: Contribution to journalJournal articlepeer-review

Published
Article number114241
<mark>Journal publication date</mark>1/09/2020
<mark>Journal</mark>Journal of Electroanalytical Chemistry
Volume872
Number of pages12
Publication StatusPublished
Early online date18/05/20
<mark>Original language</mark>English

Abstract

The simple ferrocene/ferrocenium ion (Fc/FcBF4) redox couple was examined as a model chemistry for non-aqueous redox flow battery research. Its properties were fully characterised using voltammetry, flow-cell battery cycling, and UV–vis spectroscopy to validate flow-cell performance. Fc demonstrates facile kinetics and high stability of its oxidation states, making the Fc/FcBF4 redox couple a useful low-cost model chemistry, despite its limited 0.16 M solubility in acetonitrile. By use of ‘single redox couple cycling’, in which only the Fc/FcBF4 redox couple is battery cycled, the high capacity retention of Fc at 10 mM concentration was demonstrated; 80% capacity retention after 200 cycles (7.8 days). The mechanism for the capacity loss was investigated and diagnosed to occur via FcBF4 decomposition in the electrolyte, which proceeds irrespective of battery cycling.

Bibliographic note

This is the author’s version of a work that was accepted for publication in Journal of Electroanalytical Chemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Electroanalytical Chemistry, 872, 2020 DOI: 10.1016/j.jelechem.2020.114241