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Efficient AcFc‐[FeIII(acac)3] Redox Couple for Non‐aqueous Redox Flow Battery at Low Temperature

The energy storage capacity of a Non-aqueous Redox Flow Battery (NARFBs) has been reported. This battery system's cell voltage was 1.41 V with a Coulombic efficiency >99%. Both the negolyte and posolyte materials can preserve their stability after completing the battery cycle at different temperatures. This battery system can be cost-effective and suitable for low-temperature use.


The temperature dependency of the electrochemical analysis of acetyl ferrocene (AcFc) and iron(III) acetylacetonate ([Fe(acac)3]) has been investigated for non-aqueous redox flow batteries (NARFBs). AcFc and [Fe(acac)3] were utilized as catholyte and anolyte species, respectively, in an electrochemical cell with a cell voltage of 1.41 V and Coulombic efficiencies >99% for up to 50 total cycles at room temperature (RT, 25 °C). Experiments with a rotating ring disk electrode (RRDE) indicate that the diffusion coefficient reduces with decreasing temperature from 25 °C to 0 °C, yet the overall storage capacity was higher than that of an aqueous redox flow battery (ARFBs). The electrochemical kinetic rate constant (k0) of AcFc was found to be greater than that of [Fe(acac)3]. However, the value of k0 was not affected by the variable temperature. 1H NMR investigations reveal that temperature change during battery trials did not occur in any structural modification. The obtained result demonstrates the suitability of this battery at low temperatures.

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