Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 49, Pages 17988-17996Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c05687
Keywords
riitroxide radiculs; ionic liquids; stabilization; organic rddical batteries; cyclic voltammetry
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Funding
- [DP200101664]
- Australian Research Council [DP200101664] Funding Source: Australian Research Council
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Nitroxide radicals are considered as ideal redox species in all-organic redox flow batteries due to their redox potential of similar to 2 V. These radicals are predominantly used in their polymerized form as cathode materials to a high efficiency. Attempts to use poly(nitroxide)s as anode materials have been unsuccessful due to irreversibility of the reduction process as the reduced form of a nitroxide undergoes a fast, irreversible proton transfer with an electrolyte. In this study, reduction of the nitroxide radical, TEMPO, was shown to become reversible in an ionic liquid. A redox potential of 2.5 V was achieved, with the reduction reversibility being maintained after 200 cycles. A fabricated symmetric electrochemical cell demonstrated a high coulombic efficiency of 60% over an extended period of time. This is the first report demonstrating a high degree of reversibility of nitroxide reduction, thus leading to a paradigm shift in the future design of redox flow batteries.
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