In Situ Kinetics Studies in All-Vanadium Redox Flow Batteries

We report results of polarization measurements resolved for the negative and positive electrodes of vanadium redox batteries (VRBs) using a dynamic hydrogen electrode in an operating battery cell. Electrochemical experiments with symmetric electrolyte feeds were also performed. Greater kinetic polar...

Full description

Saved in:
Bibliographic Details
Published inECS electrochemistry letters Vol. 2; no. 3; pp. A29 - A31
Main Authors Aaron, Douglas, Sun, Che-Nan, Bright, Michael, Papandrew, Alexander B., Mench, Matthew M., Zawodzinski, Thomas A.
Format Journal Article
LanguageEnglish
Published United States The Electrochemical Society 08.01.2013
Online AccessGet full text

Cover

More Information
Summary:We report results of polarization measurements resolved for the negative and positive electrodes of vanadium redox batteries (VRBs) using a dynamic hydrogen electrode in an operating battery cell. Electrochemical experiments with symmetric electrolyte feeds were also performed. Greater kinetic polarization is observed at the negative (V3/2+) electrode compared to the positive electrode (V5/4+), in contrast with previously reported ex situ measurements. For the positive electrode, the polarization in the low-current regime was modest and was not kinetically controlled. The relative rates of reaction are a surprise since it might be expected that the V3/2+ redox reaction is a simple outer-sphere electron transfer.
Bibliography:001303EEL
USDOE
DE-AC05-00OR22725
ISSN:2162-8726
2162-8734
DOI:10.1149/2.001303eel