Interplay between water uptake, ion interactions, and conductivity in an e-beam grafted poly(ethylene-co-tetrafluoroethylene) anion exchange membrane

Pandey, Tara P.; Maes, Ashley M.; Sarode, Himanshu N.; Peters, Bethanne D.; Lavina, Sandra; Vezzù, Keti; Yang, Yuan; Poynton, Simon D.; Varcoe, John R.; Seifert, Soenke; Liberatore, Matthew W.; Di Noto, Vito; Herring, Andrew M.

doi:10.1039/C4CP05755D

Title: Interplay between water uptake, ion interactions, and conductivity in an e-beam grafted poly(ethylene-co-tetrafluoroethylene) anion exchange membrane

Journal Article · Tue Dec 23 00:00:00 EST 2014 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/C4CP05755D· OSTI ID:1214333

Pandey, Tara P. ^[1]; Maes, Ashley M. ^[1]; Sarode, Himanshu N. ^[1]; Peters, Bethanne D. ^[1]; Lavina, Sandra ^[2]; Vezzù, Keti ^[3]; Yang, Yuan ^[1]; Poynton, Simon D. ^[4]; Varcoe, John R. ^[4]; Seifert, Soenke ^[5]; Liberatore, Matthew W. ^[1]; Di Noto, Vito ^[2]; Herring, Andrew M. ^[1]

Colorado School of Mines, Golden, CO (United States)
Univ. of Padova (Italy)
Univ. of Padova (Italy);Veneto Nanotech (Italy)
Univ. of Surrey, Guildford (United Kingdom)
Argonne National Lab. (ANL), Argonne, IL (United States)

We demonstrate that the true hydroxide conductivity in an e-beam grafted poly(ethylene-co-tetrafluoroethylene) [ETFE] anion exchange membrane (AEM) is as high as 132 mS cm^-1 at 80 °C and 95% RH, comparable to a proton exchange membrane, but with very much less water present in the film. To understand this behaviour we studied ion transport of hydroxide, carbonate, bicarbonate and chloride, as well as water uptake and distribution. Water uptake of the AEM in water vapor is an order of magnitude lower than when submerged in liquid water. In addition ¹⁹F pulse field gradient spin echo NMR indicates that there is little tortuosity in the ionic pathways through the film. A complete analysis of the IR spectrum of the AEM and the analyses of water absorption using FT-IR led to conclusion that the fluorinated backbone chains do not interact with water and that two types of water domains exist within the membrane. Furthermore, the reduction in conductivity was measured during exposure of the OH^- form of the AEM to air at 95% RH and was seen to be much slower than the reaction of CO₂ with OH^- as the amount of water in the film determines its ionic conductivity and at relative wet RHs its re-organization is slow.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357; EP/I004882/1; W911NF-11-1-0462; CHE-0923537

OSTI ID:: 1214333

Alternate ID(s):: OSTI ID: 1241258

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Vol. 17, Issue 6; ISSN 1463-9076

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 78 works

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