Analysis of the oxidation of the V(II) by dissolved oxygen using UV-visible spectrophotometry in a vanadium redox flow battery

Nak Heon Choi, Soon Kwan Kwon, Hansung Kim

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

In this study, the oxidation of the V(II) by dissolved oxygen was examined quantitatively using UV-visible spectrophotometry. UV-visible spectrophotometry is an accurate method of determining the concentration of vanadium ions at both the negative and positive half-cell electrolytes. To apply Beer's law, the concentration should be diluted below 0.15 M to achieve a linear relationship between the absorbance and concentration. UV-visible spectrophotometry revealed that the concentration of V(II) in the negative half-cell electrolyte decreases continuously with cycling due to the rapid oxidation of the V(II) by dissolved oxygen. This decrease gives rise to an imbalance between the positive and negative half-cell electrolytes, which results in a significant capacity loss.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume160
Issue number6
DOIs
Publication statusPublished - 2013 Sep 24

Fingerprint

Vanadium
Spectrophotometry
Dissolved oxygen
spectrophotometry
vanadium
Electrolytes
electric batteries
Oxidation
oxidation
electrolytes
oxygen
cells
Beer law
Ions
cycles
Flow batteries
ions

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

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Analysis of the oxidation of the V(II) by dissolved oxygen using UV-visible spectrophotometry in a vanadium redox flow battery. / Choi, Nak Heon; Kwon, Soon Kwan; Kim, Hansung.

In: Journal of the Electrochemical Society, Vol. 160, No. 6, 24.09.2013.

Research output: Contribution to journalArticle

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