Ionic Resistance and Permselectivity Tradeoffs in Anion Exchange Membranes

Handle URI:
http://hdl.handle.net/10754/598675
Title:
Ionic Resistance and Permselectivity Tradeoffs in Anion Exchange Membranes
Authors:
Geise, Geoffrey M.; Hickner, Michael A.; Logan, Bruce E.
Abstract:
Salinity gradient energy technologies, such as reverse electrodialysis (RED) and capacitive mixing based on Donnan potential (Capmix CDP), could help address the global need for noncarbon-based energy. Anion exchange membranes (AEMs) are a key component in these systems, and improved AEMs are needed in order to optimize and extend salinity gradient energy technologies. We measured ionic resistance and permselectivity properties of quaternary ammonium-functionalized AEMs based on poly(sulfone) and poly(phenylene oxide) polymer backbones and developed structure-property relationships between the transport properties and the water content and fixed charge concentration of the membranes. Ion transport and ion exclusion properties depend on the volume fraction of water in the polymer membrane, and the chemical nature of the polymer itself can influence fine-tuning of the transport properties to obtain membranes with other useful properties, such as chemical and dimensional stability. The ionic resistance of the AEMs considered in this study decreased by more than 3 orders of magnitude (i.e., from 3900 to 1.6 Ω m) and the permselectivity decreased by 6% (i.e., from 0.91 to 0.85) as the volume fraction of water in the polymer was varied by a factor of 3.8 (i.e., from 0.1 to 0.38). Water content was used to rationalize a tradeoff relationship between the permselectivity and ionic resistance of these AEMs whereby polymers with higher water content tend to have lower ionic resistance and lower permselectivity. The correlation of ion transport properties with water volume fraction and fixed charge concentration is discussed with emphasis on the importance of considering water volume fraction when interpreting ion transport data. © 2013 American Chemical Society.
Citation:
Geise GM, Hickner MA, Logan BE (2013) Ionic Resistance and Permselectivity Tradeoffs in Anion Exchange Membranes. ACS Applied Materials & Interfaces 5: 10294–10301. Available: http://dx.doi.org/10.1021/am403207w.
Publisher:
American Chemical Society (ACS)
Journal:
ACS Applied Materials & Interfaces
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
23-Oct-2013
DOI:
10.1021/am403207w
PubMed ID:
24040962
Type:
Article
ISSN:
1944-8244; 1944-8252
Sponsors:
This research was supported by funding through the King Abdullah University of Science and Technology (KAUST) (Award KUS-I1-003-13).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorGeise, Geoffrey M.en
dc.contributor.authorHickner, Michael A.en
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2016-02-25T13:34:15Zen
dc.date.available2016-02-25T13:34:15Zen
dc.date.issued2013-10-23en
dc.identifier.citationGeise GM, Hickner MA, Logan BE (2013) Ionic Resistance and Permselectivity Tradeoffs in Anion Exchange Membranes. ACS Applied Materials & Interfaces 5: 10294–10301. Available: http://dx.doi.org/10.1021/am403207w.en
dc.identifier.issn1944-8244en
dc.identifier.issn1944-8252en
dc.identifier.pmid24040962en
dc.identifier.doi10.1021/am403207wen
dc.identifier.urihttp://hdl.handle.net/10754/598675en
dc.description.abstractSalinity gradient energy technologies, such as reverse electrodialysis (RED) and capacitive mixing based on Donnan potential (Capmix CDP), could help address the global need for noncarbon-based energy. Anion exchange membranes (AEMs) are a key component in these systems, and improved AEMs are needed in order to optimize and extend salinity gradient energy technologies. We measured ionic resistance and permselectivity properties of quaternary ammonium-functionalized AEMs based on poly(sulfone) and poly(phenylene oxide) polymer backbones and developed structure-property relationships between the transport properties and the water content and fixed charge concentration of the membranes. Ion transport and ion exclusion properties depend on the volume fraction of water in the polymer membrane, and the chemical nature of the polymer itself can influence fine-tuning of the transport properties to obtain membranes with other useful properties, such as chemical and dimensional stability. The ionic resistance of the AEMs considered in this study decreased by more than 3 orders of magnitude (i.e., from 3900 to 1.6 Ω m) and the permselectivity decreased by 6% (i.e., from 0.91 to 0.85) as the volume fraction of water in the polymer was varied by a factor of 3.8 (i.e., from 0.1 to 0.38). Water content was used to rationalize a tradeoff relationship between the permselectivity and ionic resistance of these AEMs whereby polymers with higher water content tend to have lower ionic resistance and lower permselectivity. The correlation of ion transport properties with water volume fraction and fixed charge concentration is discussed with emphasis on the importance of considering water volume fraction when interpreting ion transport data. © 2013 American Chemical Society.en
dc.description.sponsorshipThis research was supported by funding through the King Abdullah University of Science and Technology (KAUST) (Award KUS-I1-003-13).en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjection exchange membraneen
dc.subjection transporten
dc.subjectpolymer swellingen
dc.subjectquaternary ammonium polymeren
dc.subjectwater uptakeen
dc.titleIonic Resistance and Permselectivity Tradeoffs in Anion Exchange Membranesen
dc.typeArticleen
dc.identifier.journalACS Applied Materials & Interfacesen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
kaust.grant.numberKUS-I1-003-13en

Related articles on PubMed

All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.