Imidazolium-functionalized liquid ferrocene derivative positive material enables robust cycling stability of non-aqueous redox flow battery

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-07-15
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Mcode
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Language
en
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Chemical Engineering Journal, Volume 468
Abstract
The non-aqueous redox flow battery (NARFB) is a very promising technology for the grid-scale energy storage; however, its wide application is seriously limited by the cycling stability. Here, we designed a ferrocene derivative by imidazole-functionalization and grafting an oligoether chain, 1-ferrocenylmethyl-3-(2-(2-(2-methoxyethoxy)ethoxy)ethyl) imidazolium-bis(trifluoromethylsulfonyl)imide (FcMITEGTFSI). The imidazolium cationic group induces a positive shift in the redox potential of the ferrocene core whilst ensuring the stability of the active species; the flexible oligoether side chain renders the molecule a liquid at room temperature (25 °C) and miscible with acetonitrile solvent. The flow battery shows robust cycling stability, with an overall discharge capacity retention of ≈95.5% after 200 cycles, corresponding to a capacity retention of ≈99.98% per cycle at 25 mA cm−2 with 0.1 M electrolyte.
Description
Funding Information: The work was financially supported by the National Natural Science Foundation of China ( 21636007 ). Publisher Copyright: © 2023 Elsevier B.V.
Keywords
Energy storage material, Ferrocene, Non-aqueous RFB
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Citation
Zhen, Y, Zhang, C & Li, Y 2023, ' Imidazolium-functionalized liquid ferrocene derivative positive material enables robust cycling stability of non-aqueous redox flow battery ', Chemical Engineering Journal, vol. 468, 143697 . https://doi.org/10.1016/j.cej.2023.143697