High-Voltage Aqueous Redox Flow Batteries Enabled by Catalyzed Water Dissociation and Acid–Base Neutralization in Bipolar Membranes
Abstract
Aqueous redox flow batteries that employ organic molecules as redox couples hold great promise for mitigating the intermittency of renewable electricity through efficient, low-cost diurnal storage. However, low cell potentials and sluggish ion transport often limit the achievable power density. Here, we explore bipolar membrane (BPM)-enabled acid–base redox flow batteries in which the positive and negative electrodes operate in the alkaline and acidic electrolytes, respectively. This new configuration adds the potential arising from the pH difference across the membrane and enables an open circuit voltage of ~1.6 V. In contrast, the same redox molecules operating at a single pH generate ~0.9 V. Ion transport in the BPM is coupled to the water dissociation and acid–base neutralization reactions. Interestingly, experiments and numerical modeling show that both of these processes must be catalyzed in order for the battery to function efficiently. The acid–base concept provides a potentially powerful approach to increase the energy storage capacity of aqueous redox flow batteries, and insights into the catalysis of the water dissociation and neutralization reactions in BPMs may be applicable to related electrochemical energy conversion devices.
- Authors:
-
[1];
[1]
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States
- Publication Date:
- Research Org.:
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Advanced Research Projects Agency - Energy (ARPA-E)
- OSTI Identifier:
- 1785157
- Alternate Identifier(s):
- OSTI ID: 1798268; OSTI ID: 1798269
- Grant/Contract Number:
- SC0019445; AR0001035
- Resource Type:
- Published Article
- Journal Name:
- ACS Central Science
- Additional Journal Information:
- Journal Name: ACS Central Science Journal Volume: 7 Journal Issue: 6; Journal ID: ISSN 2374-7943
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; Redox reactions; Dissociation; Catalysts; Batteries; Electrolytes
Citation Formats
Yan, Zhifei, Wycisk, Ryszard J., Metlay, Amy S., Xiao, Langqiu, Yoon, Yein, Pintauro, Peter N., and Mallouk, Thomas E. High-Voltage Aqueous Redox Flow Batteries Enabled by Catalyzed Water Dissociation and Acid–Base Neutralization in Bipolar Membranes. United States: N. p., 2021.
Web. doi:10.1021/acscentsci.1c00217.
Yan, Zhifei, Wycisk, Ryszard J., Metlay, Amy S., Xiao, Langqiu, Yoon, Yein, Pintauro, Peter N., & Mallouk, Thomas E. High-Voltage Aqueous Redox Flow Batteries Enabled by Catalyzed Water Dissociation and Acid–Base Neutralization in Bipolar Membranes. United States. https://doi.org/10.1021/acscentsci.1c00217
Yan, Zhifei, Wycisk, Ryszard J., Metlay, Amy S., Xiao, Langqiu, Yoon, Yein, Pintauro, Peter N., and Mallouk, Thomas E. Fri .
"High-Voltage Aqueous Redox Flow Batteries Enabled by Catalyzed Water Dissociation and Acid–Base Neutralization in Bipolar Membranes". United States. https://doi.org/10.1021/acscentsci.1c00217.
@article{osti_1785157,
title = {High-Voltage Aqueous Redox Flow Batteries Enabled by Catalyzed Water Dissociation and Acid–Base Neutralization in Bipolar Membranes},
author = {Yan, Zhifei and Wycisk, Ryszard J. and Metlay, Amy S. and Xiao, Langqiu and Yoon, Yein and Pintauro, Peter N. and Mallouk, Thomas E.},
abstractNote = {Aqueous redox flow batteries that employ organic molecules as redox couples hold great promise for mitigating the intermittency of renewable electricity through efficient, low-cost diurnal storage. However, low cell potentials and sluggish ion transport often limit the achievable power density. Here, we explore bipolar membrane (BPM)-enabled acid–base redox flow batteries in which the positive and negative electrodes operate in the alkaline and acidic electrolytes, respectively. This new configuration adds the potential arising from the pH difference across the membrane and enables an open circuit voltage of ~1.6 V. In contrast, the same redox molecules operating at a single pH generate ~0.9 V. Ion transport in the BPM is coupled to the water dissociation and acid–base neutralization reactions. Interestingly, experiments and numerical modeling show that both of these processes must be catalyzed in order for the battery to function efficiently. The acid–base concept provides a potentially powerful approach to increase the energy storage capacity of aqueous redox flow batteries, and insights into the catalysis of the water dissociation and neutralization reactions in BPMs may be applicable to related electrochemical energy conversion devices.},
doi = {10.1021/acscentsci.1c00217},
journal = {ACS Central Science},
number = 6,
volume = 7,
place = {United States},
year = {Fri May 28 00:00:00 EDT 2021},
month = {Fri May 28 00:00:00 EDT 2021}
}
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