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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Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Characterisation of the ferrocene/ferrocenium ion redox couple as a model chemistry for non-aqueous redox flow battery research
AU - Armstrong, C.G.
AU - Hogue, R.W.
AU - Toghill, K.E.
N1 - 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
PY - 2020/9/1
Y1 - 2020/9/1
N2 - 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.
AB - 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.
KW - Capacity loss diagnosis
KW - Ferrocene model chemistry
KW - Flow-cell diagnostics
KW - Non-aqueous
KW - Redox Flow Battery
KW - Electrolytes
KW - Iron compounds
KW - Organometallics
KW - Battery cycling
KW - Capacity loss
KW - Capacity retention
KW - High capacity
KW - Model chemistry
KW - Oxidation state
KW - Redox couple
KW - VIS spectroscopy
KW - Flow batteries
U2 - 10.1016/j.jelechem.2020.114241
DO - 10.1016/j.jelechem.2020.114241
M3 - Journal article
VL - 872
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
SN - 0022-0728
M1 - 114241
ER -