Electrochemical analysis of charge mediator product composition through transient model and experimental validation

Daniel Moreno, Jesse Thompson, Ayokunle Omosebi, James Landon, Kunlei Liu

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Charge carriers have been studied for use in applications such as fuel cells, redox flow batteries, and electrochemical CO2 reactors for conversion to value-added products. Here, transient-based equilibrium models are developed for two well-known charge carriers: methyl viologen (MV) and ethyl viologen (EV). The models are simulated using Butler-Volmer kinetics until steady-state is reached. EV is favored over MV due to lower dimerization, and enabling over 2 × production of reduced EV+ over MV+. MV and EV products do not appear to significantly change, except only under sufficiently acidic conditions (pH < 4). Charge and energy input requirement are used to assess total system efficiency and potential for system scale-up via chronoamperometry. The charge and energy analysis performed with EV as the charge carrier reveals that optimal charging voltage is around − 0.8 to − 0.85 V vs. Ag/AgCl, which is above the minimum reduction voltage (around − 0.6 to − 0.7 V vs. Ag/AgCl) and suggest more favorable conditions for performing such charge carrier reductions. Graphical abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)1573-1584
Number of pages12
JournalJournal of Applied Electrochemistry
Volume52
Issue number11
DOIs
StatePublished - Nov 2022

Bibliographical note

Funding Information:
The authors would like to thank the U.S. Department of Energy for primary financial support for this project (Grant No. DE-FE0031720). The authors would also like to thank Dr. Susan Odom (University of Kentucky) for providing additional insight and discussion on the charge carrier structures, and Dr. Chin Ng (University of Kentucky) for contributions to the modeling equations.

Funding Information:
The authors would like to thank the U.S. Department of Energy for primary financial support for this project (Grant No. DE-FE0031720). The authors would also like to thank Dr. Susan Odom (University of Kentucky) for providing additional insight and discussion on the charge carrier structures, and Dr. Chin Ng (University of Kentucky) for contributions to the modeling equations.

Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Nature B.V.

Keywords

  • Batch cell reactor
  • Charge carrier
  • Chronoamperometry
  • Cyclic voltammetry
  • Electrocatalysis
  • Modeling
  • Speciation
  • Viologen

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Electrochemistry
  • Materials Chemistry

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