Comment on "analysis of crossover-induced capacity fade in redox flow batteries with non-selective separators" [J. Electrochem. Soc., 165 A3144 (2018)]

Venkat Pavan Nemani, Kyle C. Smith

Research output: Contribution to journalReview article

Abstract

The particular overpotential definition used in expressing the kinetic rate constants given by Marcus-Hush-Chidsey (MHC) theory was incorrect in our original article [J. Electrochem. Soc., 165, A3144 (2018)] and has been corrected here to be expressed in terms of the standard overpotential. Implementation of the corrected rate constants is necessary to reproduce near-equilibrium variations of cell voltage with state-of-charge, a property that is assured by the de Donder relation. However, we find that the RFB performance metrics presented in our original article (discharge capacity utilization, capacity fade, and time-averaged polarization) change insignificantly after correction of this theory and its implementation in our numerical model. While future studies should acknowledge this subtle point, no conclusions from our original article were changed by the error in the theory originally presented.

Original languageEnglish (US)
Pages (from-to)Y29-Y30
JournalJournal of the Electrochemical Society
Volume166
Issue number12
DOIs
StatePublished - Jan 1 2019

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Separators
Rate constants
Numerical models
Polarization
Kinetics
Electric potential
Flow batteries

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

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abstract = "The particular overpotential definition used in expressing the kinetic rate constants given by Marcus-Hush-Chidsey (MHC) theory was incorrect in our original article [J. Electrochem. Soc., 165, A3144 (2018)] and has been corrected here to be expressed in terms of the standard overpotential. Implementation of the corrected rate constants is necessary to reproduce near-equilibrium variations of cell voltage with state-of-charge, a property that is assured by the de Donder relation. However, we find that the RFB performance metrics presented in our original article (discharge capacity utilization, capacity fade, and time-averaged polarization) change insignificantly after correction of this theory and its implementation in our numerical model. While future studies should acknowledge this subtle point, no conclusions from our original article were changed by the error in the theory originally presented.",
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