Analysis of concentration polarization using UV-visible spectrophotometry in a vanadium redox flow battery

Hyo June Lee, Nak Heon Choi, Hansung Kim

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

In this study, the concentration of vanadium ions in a carbon felt electrode was examined quantitatively using UV-visible spectrophotometry with respect to the current density and flow rate to examine the effect of the concentration overpotential on the performance of a vanadium redox flow battery (VRB). Experimental results revealed that the concentration of vanadium ions in the positive electrode is different from that observed in the positive electrolyte tank, and the deviation increases with increasing current density and decreasing flow rate. The concentration of V(IV) is higher in the positive electrode compared to the positive electrolyte tank after the discharging process, which leads to a premature cut-off in the discharge of the VRB. Therefore, this result suggests that it is important to improve electrolyte transport through the electrode for better performance of VRBs, and the measurement of the concentration of vanadium ions in the electrode could be useful for studying the concentration overpotential.

Original languageEnglish
Pages (from-to)A1291-A1296
JournalJournal of the Electrochemical Society
Volume161
Issue number9
DOIs
Publication statusPublished - 2014

Fingerprint

Vanadium
Spectrophotometry
spectrophotometry
vanadium
electric batteries
Polarization
Electrodes
Electrolytes
polarization
electrodes
Ions
electrolytes
Current density
Flow rate
flow velocity
current density
ions
Flow batteries
cut-off
Carbon

All Science Journal Classification (ASJC) codes

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

Cite this

@article{06a8e63d68c84653817370e461b247e9,
title = "Analysis of concentration polarization using UV-visible spectrophotometry in a vanadium redox flow battery",
abstract = "In this study, the concentration of vanadium ions in a carbon felt electrode was examined quantitatively using UV-visible spectrophotometry with respect to the current density and flow rate to examine the effect of the concentration overpotential on the performance of a vanadium redox flow battery (VRB). Experimental results revealed that the concentration of vanadium ions in the positive electrode is different from that observed in the positive electrolyte tank, and the deviation increases with increasing current density and decreasing flow rate. The concentration of V(IV) is higher in the positive electrode compared to the positive electrolyte tank after the discharging process, which leads to a premature cut-off in the discharge of the VRB. Therefore, this result suggests that it is important to improve electrolyte transport through the electrode for better performance of VRBs, and the measurement of the concentration of vanadium ions in the electrode could be useful for studying the concentration overpotential.",
author = "Lee, {Hyo June} and Choi, {Nak Heon} and Hansung Kim",
year = "2014",
doi = "10.1149/2.0631409jes",
language = "English",
volume = "161",
pages = "A1291--A1296",
journal = "Journal of the Electrochemical Society",
issn = "0013-4651",
publisher = "Electrochemical Society, Inc.",
number = "9",

}

Analysis of concentration polarization using UV-visible spectrophotometry in a vanadium redox flow battery. / Lee, Hyo June; Choi, Nak Heon; Kim, Hansung.

In: Journal of the Electrochemical Society, Vol. 161, No. 9, 2014, p. A1291-A1296.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Analysis of concentration polarization using UV-visible spectrophotometry in a vanadium redox flow battery

AU - Lee, Hyo June

AU - Choi, Nak Heon

AU - Kim, Hansung

PY - 2014

Y1 - 2014

N2 - In this study, the concentration of vanadium ions in a carbon felt electrode was examined quantitatively using UV-visible spectrophotometry with respect to the current density and flow rate to examine the effect of the concentration overpotential on the performance of a vanadium redox flow battery (VRB). Experimental results revealed that the concentration of vanadium ions in the positive electrode is different from that observed in the positive electrolyte tank, and the deviation increases with increasing current density and decreasing flow rate. The concentration of V(IV) is higher in the positive electrode compared to the positive electrolyte tank after the discharging process, which leads to a premature cut-off in the discharge of the VRB. Therefore, this result suggests that it is important to improve electrolyte transport through the electrode for better performance of VRBs, and the measurement of the concentration of vanadium ions in the electrode could be useful for studying the concentration overpotential.

AB - In this study, the concentration of vanadium ions in a carbon felt electrode was examined quantitatively using UV-visible spectrophotometry with respect to the current density and flow rate to examine the effect of the concentration overpotential on the performance of a vanadium redox flow battery (VRB). Experimental results revealed that the concentration of vanadium ions in the positive electrode is different from that observed in the positive electrolyte tank, and the deviation increases with increasing current density and decreasing flow rate. The concentration of V(IV) is higher in the positive electrode compared to the positive electrolyte tank after the discharging process, which leads to a premature cut-off in the discharge of the VRB. Therefore, this result suggests that it is important to improve electrolyte transport through the electrode for better performance of VRBs, and the measurement of the concentration of vanadium ions in the electrode could be useful for studying the concentration overpotential.

UR - http://www.scopus.com/inward/record.url?scp=84904901629&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84904901629&partnerID=8YFLogxK

U2 - 10.1149/2.0631409jes

DO - 10.1149/2.0631409jes

M3 - Article

AN - SCOPUS:84904901629

VL - 161

SP - A1291-A1296

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

SN - 0013-4651

IS - 9

ER -