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Title: A multiscale-pore ion exchange membrane for better energy efficiency

Journal Article · · Journal of Materials Chemistry A
DOI:https://doi.org/10.1039/C7TA10570C· OSTI ID:1454887
ORCiD logo [1];  [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Department of Electrical Engineering and Computer Science, Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, USA
  2. Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, Korea 37673

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.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0000294
OSTI ID:
1454887
Alternate ID(s):
OSTI ID: 1434140; OSTI ID: 1557694
Journal Information:
Journal of Materials Chemistry A, Journal Name: Journal of Materials Chemistry A Vol. 6 Journal Issue: 17; ISSN 2050-7488
Publisher:
Royal Society of Chemistry (RSC)Copyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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