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Updated: Aug 22, 2025
A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
Published on: February 13, 2017
Efficient AcFc-[FeIII (acac)3 ] Redox Couple for Non-aqueous Redox Flow Battery at Low Temperature
Md Motiur Rahaman Mazumder1,2, Rezoanul Islam1, M Azizur R Khan3
1Department of Chemistry and Biochemistry, Auburn University, Auburn, AL 36849, USA.
Abstract:
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. 1 H 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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