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Appl. Sci. 2014, 4(2), 195-206; doi:10.3390/app4020195

Chemical Surface, Thermal and Electrical Characterization of Nafion Membranes Doped with IL-Cations

1
Department of Applied Physic I, Faculty of Science, University of Malaga, E-29071 Malaga, Spain
2
Department of Inroganic Chemistry, Faculty of Science, University of Malaga, E-29071 Malaga, Spain
*
Author to whom correspondence should be addressed.
Received: 31 October 2013 / Revised: 10 March 2014 / Accepted: 17 April 2014 / Published: 29 April 2014
(This article belongs to the Special Issue Polymer Electrolyte Membrane (PEM) Fuel Cells)
View Full-Text   |   Download PDF [1809 KB, 6 May 2014; original version 29 April 2014]   |  

Abstract

Surface and bulk changes in a Nafion membrane as a result of IL-cation doping (1-butyl-3-methylimidazolium tetrafluoroborate or BMIM+BF4 and phenyltrimethylammonium chloride or TMPA+Cl) were studied by X-ray photoelectron spectroscopy (XPS), contact angle, differential scanning calorimetry (DSC) and impedance spectroscopy (IS) measurements performed with dry samples after 24 h in contact with the IL-cations BMIM+ and TMPA+. IL-cations were selected due to their similar molecular weight and molar volume but different shape, which could facilitate/obstruct the cation incorporation in the Nafion membrane structure by proton/cation exchange mechanism. The surface coverage of the Nafion membrane by the IL-cations was confirmed by XPS analysis and contact angle, while the results obtained by the other two techniques (DSC and IS) seem to indicate differences in thermal and electrical behaviour depending on the doping-cation, being less resistive the Nafion/BMIM+ membrane. For that reason, determination of the ion transport number was obtained for this membrane by measuring the membrane or concentration potential with the samples in contact with HCl solutions at different concentrations. The comparison of these results with those obtained for the original Nafion membrane provides information on the effect of IL-cation BMIM+ on the transport of H+ across wet Nafion/BMIM+ doped membranes. View Full-Text
Keywords: Nafion; ionic liquids; XPS; impedance spectroscopy; contact angle; hydrophobic character Nafion; ionic liquids; XPS; impedance spectroscopy; contact angle; hydrophobic character
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

del Valle Martínez de Yuso, M.; Arango-Díaz, A.; Bijani, S.; Romero, V.; Benavente, J.; Rodríguez-Castellón, E. Chemical Surface, Thermal and Electrical Characterization of Nafion Membranes Doped with IL-Cations. Appl. Sci. 2014, 4, 195-206.

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