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Title: Elucidating effects of cell architecture, electrode material, and solution composition on overpotentials in redox flow batteries

Abstract

Here, an improved method for quantitative measurement of the charge transfer, finite diffusion, and ohmic overpotentials in redox flow batteries using electrochemical impedance spectroscopy is presented. The use of a pulse dampener in the hydraulic circuit enables the collection of impedance spectra at low frequencies with a peristaltic pump, allowing the measurement of finite diffusion resistances at operationally relevant flow rates. This method is used to resolve the rate-limiting processes for the V 2+/V 3+ redox couple on carbon felt and carbon paper electrodes in the vanadium redox flow battery. Carbon felt was limited by both charge transfer and ohmic resistance, while carbon paper was limited by charge transfer, finite diffusion, and ohmic resistances. The influences of vanadium concentration and flow field design also are quantified.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [2];  [3];  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1399235
DOE Contract Number:
AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Electrochimica Acta; Journal Volume: 229; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 25 ENERGY STORAGE; electrochemical impedance spectroscopy; redox flow battery; rate constant; impedance-resolved polarization; finite diffusion resistance

Citation Formats

Pezeshki, Alan M., Sacci, Robert L., Delnick, Frank M., Aaron, Douglas S., and Mench, Matthew M. Elucidating effects of cell architecture, electrode material, and solution composition on overpotentials in redox flow batteries. United States: N. p., 2017. Web. doi:10.1016/j.electacta.2017.01.056.
Pezeshki, Alan M., Sacci, Robert L., Delnick, Frank M., Aaron, Douglas S., & Mench, Matthew M. Elucidating effects of cell architecture, electrode material, and solution composition on overpotentials in redox flow batteries. United States. doi:10.1016/j.electacta.2017.01.056.
Pezeshki, Alan M., Sacci, Robert L., Delnick, Frank M., Aaron, Douglas S., and Mench, Matthew M. Mon . "Elucidating effects of cell architecture, electrode material, and solution composition on overpotentials in redox flow batteries". United States. doi:10.1016/j.electacta.2017.01.056. https://www.osti.gov/servlets/purl/1399235.
@article{osti_1399235,
title = {Elucidating effects of cell architecture, electrode material, and solution composition on overpotentials in redox flow batteries},
author = {Pezeshki, Alan M. and Sacci, Robert L. and Delnick, Frank M. and Aaron, Douglas S. and Mench, Matthew M.},
abstractNote = {Here, an improved method for quantitative measurement of the charge transfer, finite diffusion, and ohmic overpotentials in redox flow batteries using electrochemical impedance spectroscopy is presented. The use of a pulse dampener in the hydraulic circuit enables the collection of impedance spectra at low frequencies with a peristaltic pump, allowing the measurement of finite diffusion resistances at operationally relevant flow rates. This method is used to resolve the rate-limiting processes for the V2+/V3+ redox couple on carbon felt and carbon paper electrodes in the vanadium redox flow battery. Carbon felt was limited by both charge transfer and ohmic resistance, while carbon paper was limited by charge transfer, finite diffusion, and ohmic resistances. The influences of vanadium concentration and flow field design also are quantified.},
doi = {10.1016/j.electacta.2017.01.056},
journal = {Electrochimica Acta},
number = C,
volume = 229,
place = {United States},
year = {Mon Jan 16 00:00:00 EST 2017},
month = {Mon Jan 16 00:00:00 EST 2017}
}