Modeling Electrochemical and Rheological Characteristics of Suspension-Based Electrodes for Redox Flow Cells

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 par...

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Veröffentlicht in:Journal of the Electrochemical Society 2023-05, Vol.170 (5), p.50532
Hauptverfasser: 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.
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container_end_page
container_issue 5
container_start_page 50532
container_title Journal of the Electrochemical Society
container_volume 170
creator 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.
description 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.
doi_str_mv 10.1149/1945-7111/accb74
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subjects Electrochemical Engineering
Flowable suspension-based electrodes
redox flow cells
rheology
semi-solid electrodes
slurry electrodes
title Modeling Electrochemical and Rheological Characteristics of Suspension-Based Electrodes for Redox Flow Cells
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