A multiscale-pore ion exchange membrane for better energy efficiency
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c7ta10570c.pdf
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Checksum (MD5)
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Author(s)
Lim, Geunbae
Kwon, Hyuckjin
Kim, Bumjoo
Han, Jongyoon
Date Issued
March 2018
Journal
Journal of Materials Chemistry A
Publisher
Royal Society of Chemistry
Citation
Kwon, Hyukjin J. et al. “A Multiscale-Pore Ion Exchange Membrane for Better Energy Efficiency.” Journal of Materials Chemistry A 6, 17 (2018): 7714–7723 © 2018 The Royal Society of Chemistry
Version
Final published version
Abstract
Ion exchange membranes (IEMs) have been adopted in various environmental, chemical, and energy applications. However, the formation of ion-depletion regions, caused by concentration polarization near IEMs, often leads to significant energy and efficiency loss. While much research has been devoted to solving this challenge, complete removal of ion-depletion regions is still difficult, especially when the membrane systems are operating under near- or over-limiting conditions. This paper proposes a novel multiscale-pore (MP) IEM to reduce the effect of the ion-depletion region, by allowing a fluid flow through the MP-IEM, thereby limiting the size (and the resulting resistance) of the ion-depletion region. The electrical resistance and energy consumption in MP and conventional IEM-embedded electrochemical systems were investigated, and their performance during water desalination processes were compared. The current-voltage response suggests a secondary ohmic regime attributed to an internal flow rate through the MP-IEM. Moreover, the electrochemical desalination of seawater with MP-IEMs demonstrated up to 75% reduction of energy consumption, compared with conventional IEMs under comparable operating conditions.
MIT Department
Massachusetts Institute of Technology. Department of Biological Engineering
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Creative Commons Attribution-NonCommercial 3.0 Unported
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DOI of Published Version
https://doi.org/10.1039/c7ta10570c
