In Situ Kinetics Studies in All-Vanadium Redox Flow Batteries

  • Aaron D
  • Sun C
  • Bright M
 et al. 
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Abstract

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 (V 3/2+) electrode compared to the positive electrode (V 5/4+), 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 V 3/2+ redox reaction is a simple outer-sphere electron transfer.

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Authors

  • D. Aaron

  • C.-N. Sun

  • M. Bright

  • A. B. Papandrew

  • M. M. Mench

  • T. A. Zawodzinski

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