Modeling Electrochemical and Rheological Characteristics of Suspension-Based Electrodes for Redox Flow Cells
Name
Majji_2023_J._Electrochem._Soc._170_050532.pdf
Description
Published version
Size
2.05 MB
Format
Adobe PDF
Checksum (MD5)
b25aae640dea9f3521b3dcf99e587ed1
Author(s)
Majji, Madhu V
Neyhouse, Bertrand J
Matteucci, Nicholas J
Lennon, Kyle R
Mallia, Christopher T
Fenton Jr., Alexis M
Swan, James W
Brushett, Fikile R
Date Issued
May 1, 2023
Journal
Journal of The Electrochemical Society
Publisher
The Electrochemical Society
Citation
Madhu V. Majji et al 2023 J. Electrochem. Soc. 170 050532
Version
Final published version
Abstract
Flowable suspension-based electrodes (FSEs) have gained attention in recent years, as the integration of solid materials into electrochemical flow cells can offer improved performance and flexible operation. However, under conditions that engender favorable electrochemical properties (e.g., high particle loading, high conductivity, high surface area), FSEs can exhibit non-Newtonian characteristics that impose large pumping losses and flow-dependent transport rates. These multifaceted trade-offs motivate the use of models to broadly explore scaling relationships and better understand design rules for electrochemical devices. To this end, we present a one-dimensional model, integrating porous electrode theory with FSE rheology as well as flow-dependent electron and mass transport under pressure-driven flow. We study FSE behavior as a function of material properties and operating conditions, identifying key dimensionless groups that describe the underlying physical processes. We assess flow cell performance by quantifying electrode polarization and relative pumping losses, establishing generalized property-performance relationships for FSEs. Importantly, we expound relevant operating regimes—based on a subset of dimensionless groups—that inform practical operating envelopes, ultimately helping to guide FSE and cell engineering for electrochemical systems.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1149/1945-7111/accb74
