Characterizing the Impact of Oligomerization on Redox Flow Cell Performance
Name
Batteries Supercaps - 2023 - Weiss - Characterizing the Impact of Oligomerization on Redox Flow Cell Performance.pdf
Description
Published version
Size
4.58 MB
Format
Adobe PDF
Checksum (MD5)
5a4054026014a75ddb073aa8f9e55336
Author(s)
Weiss, Trent A
Fan, Gang
Neyhouse, Bertrand J
Moore, Evan B
Furst, Ariel
Brushett, Fikile R
Date Issued
August 2023
Journal
Batteries & Supercaps
Publisher
Wiley
Citation
T. A. Weiss, G. Fan, B. J. Neyhouse, E. B. Moore, A. Furst, F. R. Brushett, Batteries & Supercaps 2023, 6, e202300034.
Version
Final published version
Abstract
Redox flow batteries (RFBs) are hindered by complex failure modes, particularly crossover through the membrane, resulting in capacity fade and reduced cycling efficiencies. Redox‐active oligomers (RAOs) have recently been proposed for mitigating this phenomenon while maintaining sufficient transport properties; however, to date, few studies have quantified how the chemical and electrochemical properties of RAOs influence their performance in redox flow cells. Here, we demonstrate that oligomeric derivatives of 2,2,6,6‐tetramethylpiperidine 1‐oxyl (TEMPO) exhibit lower diffusivities than the monomeric species but retain facile charge transfer characteristics. The size‐dependent variations in mass transport rates directly translate to differences in flow cell polarization and symmetric cycling performance. Post‐mortem analyses reveal that oligomerization does not meaningfully alter decay processes as evinced by similar capacity fade across all species. Broadly, these findings corroborate and extend upon previously developed relationships between molecular size, electrochemical properties, and flow cell performance.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
10.1002/batt.202300034
