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...
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Published in | ECS electrochemistry letters Vol. 2; no. 3; pp. A29 - A31 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
The Electrochemical Society
08.01.2013
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Online Access | Get full text |
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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. |
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Bibliography: | 001303EEL USDOE DE-AC05-00OR22725 |
ISSN: | 2162-8726 2162-8734 |
DOI: | 10.1149/2.001303eel |