Transport properties of hydroxide and proton conducting membranes

Michael R. Hibbs, Michael A. Hickner, Todd M. Alam, Sarah K. McIntyre, Cy H. Fujimoto, Chris J. Cornelius

Research output: Contribution to journalArticle

287 Citations (Scopus)

Abstract

Hydroxide anion conducting solid polymer membranes, also termed anion exchange membranes, are becoming important materials for electrochemical technology, and activity in this field, spurred by renewed interest in alkaline fuel cells, is experiencing a resurgence. Solid polymer anion exchange membranes enable alkaline electrochemistry in devices such as fuel cells and electrolyzers and serve as a counterpoint to proton exchange membranes, of which there is a large body of literature. For their seeming importance, the details of transport in alkaline exchange membranes has not been explored thoroughly. In this work, a chloromethylated polymer with a polysulfone backbone was synthesized. 1H NMR spectroscopy was performed to determine the chloromethyl content and its position on the polymer structure. The chloromethylated polymer was solution cast to form clear, creasable films, and subsequent soaking of these films in aqueous trimethylamine gave benzyltrimethylammonium groups. The resulting anion exchange membranes swell in water and show varying degrees of ionic conductivity depending on their ion exchange capacity. The water mobility in the anion exchange membranes was greater than in previously studied proton exchange membranes; however, the transport properties in these new materials were lower than what might have been expected from the water behavior. This comparison gives some insight as to future anion exchange membrane design objectives.

Original languageEnglish (US)
Pages (from-to)2566-2573
Number of pages8
JournalChemistry of Materials
Volume20
Issue number7
DOIs
StatePublished - Apr 8 2008

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Transport properties
Protons
Ion exchange
Membranes
Anions
Negative ions
Polymers
Water
Alkaline fuel cells
hydroxide ion
Polysulfones
Electrochemistry
Ionic conductivity
Polymer solutions
Nuclear magnetic resonance spectroscopy
Fuel cells

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

Hibbs, M. R., Hickner, M. A., Alam, T. M., McIntyre, S. K., Fujimoto, C. H., & Cornelius, C. J. (2008). Transport properties of hydroxide and proton conducting membranes. Chemistry of Materials, 20(7), 2566-2573. https://doi.org/10.1021/cm703263n

Transport properties of hydroxide and proton conducting membranes. / Hibbs, Michael R.; Hickner, Michael A.; Alam, Todd M.; McIntyre, Sarah K.; Fujimoto, Cy H.; Cornelius, Chris J.

In: Chemistry of Materials, Vol. 20, No. 7, 08.04.2008, p. 2566-2573.

Research output: Contribution to journalArticle

Hibbs, MR, Hickner, MA, Alam, TM, McIntyre, SK, Fujimoto, CH & Cornelius, CJ 2008, 'Transport properties of hydroxide and proton conducting membranes', Chemistry of Materials, vol. 20, no. 7, pp. 2566-2573. https://doi.org/10.1021/cm703263n
Hibbs, Michael R. ; Hickner, Michael A. ; Alam, Todd M. ; McIntyre, Sarah K. ; Fujimoto, Cy H. ; Cornelius, Chris J. / Transport properties of hydroxide and proton conducting membranes. In: Chemistry of Materials. 2008 ; Vol. 20, No. 7. pp. 2566-2573.
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