The Relationship between Shunt Currents and Edge Corrosion in Flow Batteries
Abstract
Shunt currents occur in electrochemical reactors like flow batteries, electrolyzers, and fuel cells where many bipolar cells that are connected in series electrically contact a mobile electrolyte through one or more common fluid distribution manifolds. Shunt currents reduce energy efficiency, and can cause unwanted side reactions including corrosion and gas generation. Equivalent-circuit models have been widely used to examine shunt currents in multi-cell electrochemical reactors. However, a detailed investigation of the interesting electrochemical processes occurring at the edges of the active areas has not been presented. In this work, the generation of shunt currents and their tendency to drive corrosion at the edges of positive electrodes in the most positive cells in a reactor stack are investigated with a comprehensive numerical model. An analytical model based on the penetration of current into a semi-infinite electrode, that can be used in conjunction with traditional equivalent-circuit models to assess the tendency for shunt currents to drive corrosion, is developed and compared to the numerical model. The models provided here can be used to set requirements on maximum allowable port currents in order to achieve a particular durability goal.
- Authors:
-
- Argonne National Lab. (ANL), Argonne, IL (United States). Joint Center for Energy Storage Research (JCESR); United Technologies Research Center, East Hartford, CT (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- United Technologies Research Center, East Hartford, CT (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Fuel Cell Technologies Office
- OSTI Identifier:
- 1506267
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Electrochemical Society
- Additional Journal Information:
- Journal Volume: 164; Journal Issue: 11; Journal ID: ISSN 0013-4651
- Publisher:
- The Electrochemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; Corrosion; Flow battery; Shunt current
Citation Formats
Darling, Robert M., Shiau, Huai-Suen, Weber, Adam Z., and Perry, Mike L. The Relationship between Shunt Currents and Edge Corrosion in Flow Batteries. United States: N. p., 2017.
Web. doi:10.1149/2.0081711jes.
Darling, Robert M., Shiau, Huai-Suen, Weber, Adam Z., & Perry, Mike L. The Relationship between Shunt Currents and Edge Corrosion in Flow Batteries. United States. doi:10.1149/2.0081711jes.
Darling, Robert M., Shiau, Huai-Suen, Weber, Adam Z., and Perry, Mike L. Tue .
"The Relationship between Shunt Currents and Edge Corrosion in Flow Batteries". United States. doi:10.1149/2.0081711jes. https://www.osti.gov/servlets/purl/1506267.
@article{osti_1506267,
title = {The Relationship between Shunt Currents and Edge Corrosion in Flow Batteries},
author = {Darling, Robert M. and Shiau, Huai-Suen and Weber, Adam Z. and Perry, Mike L.},
abstractNote = {Shunt currents occur in electrochemical reactors like flow batteries, electrolyzers, and fuel cells where many bipolar cells that are connected in series electrically contact a mobile electrolyte through one or more common fluid distribution manifolds. Shunt currents reduce energy efficiency, and can cause unwanted side reactions including corrosion and gas generation. Equivalent-circuit models have been widely used to examine shunt currents in multi-cell electrochemical reactors. However, a detailed investigation of the interesting electrochemical processes occurring at the edges of the active areas has not been presented. In this work, the generation of shunt currents and their tendency to drive corrosion at the edges of positive electrodes in the most positive cells in a reactor stack are investigated with a comprehensive numerical model. An analytical model based on the penetration of current into a semi-infinite electrode, that can be used in conjunction with traditional equivalent-circuit models to assess the tendency for shunt currents to drive corrosion, is developed and compared to the numerical model. The models provided here can be used to set requirements on maximum allowable port currents in order to achieve a particular durability goal.},
doi = {10.1149/2.0081711jes},
journal = {Journal of the Electrochemical Society},
number = 11,
volume = 164,
place = {United States},
year = {2017},
month = {4}
}
Web of Science
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