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Kowalski et al. - A Method for Evaluating Soluble Redox Couple Stability using Microelectrode Voltammetry.pdf (559.05 kB)

A Method for Evaluating Soluble Redox Couple Stability using Microelectrode Voltammetry

submitted on 20.05.2020, 13:34 and posted on 21.05.2020, 09:19 by Jeffrey Kowalski, Alexis Fenton Jr, Bertrand Neyhouse, Fikile Brushett
Soluble, redox-active, organic materials hold promise as charge-storage species for flow batteries; however, their stability during extended operation remains a key challenge. While a number of spectroscopic and electrochemical techniques are currently used to probe these complex and often ill-defined decay pathways, each technique has limitations, including accessibility and direct evaluation of practical electrolytes without preparatory steps. Here, we use microelectrode voltammetry to directly observe nonaqueous flow battery electrolytes, simultaneously identifying the rate of charged materials decay (reversible material loss) and total material decay (irreversible material loss). We validate this technique using ferrocene as a stable model redox couple, examine and address sources of error, and finally, demonstrate its capability by assessing the decay of a well-studied and moderately-stable substituted dialkoxybenzene [2,5-di-tert-butyl-1,4-bis(2-methoxyethoxy)benzene]. These results suggest that microelectrodes may have utility for rapid assessment of redox electrolyte state-of-charge and state-of-health, both in-operando and post-mortem.


Joint Center for Energy Storage Research

Graduate Research Fellowship Program

Directorate for Education & Human Resources

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Email Address of Submitting Author


Massachusetts Institute of Technology


United States of America

ORCID For Submitting Author


Declaration of Conflict of Interest

No conflict of interest


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in Journal of the Electrochemical Society

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