Specific ion effects on membrane potential and the permselectivity of ion exchange membranes

Handle URI:
http://hdl.handle.net/10754/599688
Title:
Specific ion effects on membrane potential and the permselectivity of ion exchange membranes
Authors:
Geise, Geoffrey M.; Cassady, Harrison J.; Paul, Donald R.; Logan, Bruce E.; Hickner, Michael A.
Abstract:
© the Partner Organisations 2014. Membrane potential and permselectivity are critical parameters for a variety of electrochemically-driven separation and energy technologies. An electric potential is developed when a membrane separates electrolyte solutions of different concentrations, and a permselective membrane allows specific species to be transported while restricting the passage of other species. Ion exchange membranes are commonly used in applications that require advanced ionic electrolytes and span technologies such as alkaline batteries to ammonium bicarbonate reverse electrodialysis, but membranes are often only characterized in sodium chloride solutions. Our goal in this work was to better understand membrane behaviour in aqueous ammonium bicarbonate, which is of interest for closed-loop energy generation processes. Here we characterized the permselectivity of four commercial ion exchange membranes in aqueous solutions of sodium chloride, ammonium chloride, sodium bicarbonate, and ammonium bicarbonate. This stepwise approach, using four different ions in aqueous solution, was used to better understand how these specific ions affect ion transport in ion exchange membranes. Characterization of cation and anion exchange membrane permselectivity, using these ions, is discussed from the perspective of the difference in the physical chemistry of the hydrated ions, along with an accompanying re-derivation and examination of the basic equations that describe membrane potential. In general, permselectivity was highest in sodium chloride and lowest in ammonium bicarbonate solutions, and the nature of both the counter- and co-ions appeared to influence measured permselectivity. The counter-ion type influences the binding affinity between counter-ions and polymer fixed charge groups, and higher binding affinity between fixed charge sites and counter-ions within the membrane decreases the effective membrane charge density. As a result permselectivity decreases. The charge density and polarizability of the co-ions also appeared to influence permselectivity leading to ion-specific effects; co-ions that are charge dense and have low polarizability tended to result in high membrane permselectivity. This journal is
Citation:
Geise GM, Cassady HJ, Paul DR, Logan BE, Hickner MA (2014) Specific ion effects on membrane potential and the permselectivity of ion exchange membranes. Phys Chem Chem Phys 16: 21673–21681. Available: http://dx.doi.org/10.1039/c4cp03076a.
Publisher:
Royal Society of Chemistry (RSC)
Journal:
Phys. Chem. Chem. Phys.
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
26-Aug-2014
DOI:
10.1039/c4cp03076a
PubMed ID:
25198913
Type:
Article
ISSN:
1463-9076; 1463-9084
Sponsors:
This research was supported by the King Abdullah University of Science and Technology (KAUST) (Award: KUS-I1-003-13) and through a collaborative project with Air Products & Chemicals, Inc. through a grant from the Department of Energy, Energy Efficiency and Renewable Energy Advanced Manufacturing Office, grant # DE-EE0005707.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorGeise, Geoffrey M.en
dc.contributor.authorCassady, Harrison J.en
dc.contributor.authorPaul, Donald R.en
dc.contributor.authorLogan, Bruce E.en
dc.contributor.authorHickner, Michael A.en
dc.date.accessioned2016-02-28T06:07:35Zen
dc.date.available2016-02-28T06:07:35Zen
dc.date.issued2014-08-26en
dc.identifier.citationGeise GM, Cassady HJ, Paul DR, Logan BE, Hickner MA (2014) Specific ion effects on membrane potential and the permselectivity of ion exchange membranes. Phys Chem Chem Phys 16: 21673–21681. Available: http://dx.doi.org/10.1039/c4cp03076a.en
dc.identifier.issn1463-9076en
dc.identifier.issn1463-9084en
dc.identifier.pmid25198913en
dc.identifier.doi10.1039/c4cp03076aen
dc.identifier.urihttp://hdl.handle.net/10754/599688en
dc.description.abstract© the Partner Organisations 2014. Membrane potential and permselectivity are critical parameters for a variety of electrochemically-driven separation and energy technologies. An electric potential is developed when a membrane separates electrolyte solutions of different concentrations, and a permselective membrane allows specific species to be transported while restricting the passage of other species. Ion exchange membranes are commonly used in applications that require advanced ionic electrolytes and span technologies such as alkaline batteries to ammonium bicarbonate reverse electrodialysis, but membranes are often only characterized in sodium chloride solutions. Our goal in this work was to better understand membrane behaviour in aqueous ammonium bicarbonate, which is of interest for closed-loop energy generation processes. Here we characterized the permselectivity of four commercial ion exchange membranes in aqueous solutions of sodium chloride, ammonium chloride, sodium bicarbonate, and ammonium bicarbonate. This stepwise approach, using four different ions in aqueous solution, was used to better understand how these specific ions affect ion transport in ion exchange membranes. Characterization of cation and anion exchange membrane permselectivity, using these ions, is discussed from the perspective of the difference in the physical chemistry of the hydrated ions, along with an accompanying re-derivation and examination of the basic equations that describe membrane potential. In general, permselectivity was highest in sodium chloride and lowest in ammonium bicarbonate solutions, and the nature of both the counter- and co-ions appeared to influence measured permselectivity. The counter-ion type influences the binding affinity between counter-ions and polymer fixed charge groups, and higher binding affinity between fixed charge sites and counter-ions within the membrane decreases the effective membrane charge density. As a result permselectivity decreases. The charge density and polarizability of the co-ions also appeared to influence permselectivity leading to ion-specific effects; co-ions that are charge dense and have low polarizability tended to result in high membrane permselectivity. This journal isen
dc.description.sponsorshipThis research was supported by the King Abdullah University of Science and Technology (KAUST) (Award: KUS-I1-003-13) and through a collaborative project with Air Products & Chemicals, Inc. through a grant from the Department of Energy, Energy Efficiency and Renewable Energy Advanced Manufacturing Office, grant # DE-EE0005707.en
dc.publisherRoyal Society of Chemistry (RSC)en
dc.titleSpecific ion effects on membrane potential and the permselectivity of ion exchange membranesen
dc.typeArticleen
dc.identifier.journalPhys. Chem. Chem. Phys.en
dc.contributor.institutionPennsylvania State University, State College, United Statesen
dc.contributor.institutionUniversity of Texas at Austin, Austin, United Statesen
dc.contributor.institutionUniversity of Virginia, Charlottesville, United Statesen
kaust.grant.numberKUS-I1-003-13en

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