A multiscale-pore ion exchange membrane for better energy efficiency
SCIE
SCOPUS
- Title
- A multiscale-pore ion exchange membrane for better energy efficiency
- Authors
- Kwon, Hyukjin J.; Kim, Bumjoo; Lim, Geunbae; Han, Jongyoon
- Date Issued
- 2018-05
- Publisher
- Royal Society of Chemistry
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/95899
- DOI
- 10.1039/c7ta10570c
- ISSN
- 2050-7488
- Article Type
- Article
- Citation
- Journal of Materials Chemistry A, vol. 6, no. 17, page. 7714 - 7723, 2018-05
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