Study of the mechanism of the vanadium 4+/5+ redox reaction in acidic solutions

Download
  1. (PDF, 868 KB)
  2. Get@NRC: Study of the mechanism of the vanadium 4+/5+ redox reaction in acidic solutions (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1149/1.1630594
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of the Electrochemical Society
Volume151
Issue1
PagesA123A130; # of pages: 7
AbstractThe mechanism of the vanadium VO21/VO2 1 redox couple has been examined in acidic aqueous solutions. A detailed understanding of this chemistry is of interest for improving and optimizing the performance of vanadium redox-flow batteries, a promising electrochemical electricity storage technology. The vanadium 41/51 redox reactions were studied at a rotating disk graphite electrode and polarization curves were obtained in sulfuric acid and perchloric acid, with varying pH and vanadium concentrations. The results were compared to model predictions for different mechanisms. The data were consistent with a model with a multistep chemical-electrochemical-chemical mechanism at low overpotentials, which changes to a multistep electrochemicalchemical- chemical mechanism at higher anodic or cathodic overpotentials. Unusually high Tafel slopes ~350-450 mV/decade! were observed for the reduction of VO2 1 at higher overpotentials. While this could not be directly explained by the model, insights gained through the use of the model can provide the basis for some suggestions.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology
Peer reviewedYes
NRC number52280
NPARC number16285557
Export citationExport as RIS
Report a correctionReport a correction
Record identifier17399dec-9e2c-45c6-af21-02dfd7f7bc8c
Record created2010-10-27
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)