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

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) a...
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Autor*in:	María del Valle Martínez de Yuso [verfasserIn] Ana Arango-Díaz [verfasserIn] Shanti Bijani [verfasserIn] Virgina Romero [verfasserIn] Juana Benavente [verfasserIn] Enrique Rodríguez-Castellón [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2014

Schlagwörter:	Nafion ionic liquids XPS impedance spectroscopy contact angle hydrophobic character

Übergeordnetes Werk:	In: Applied Sciences - MDPI AG, 2012, 4(2014), 2, Seite 195-206
Übergeordnetes Werk:	volume:4 ; year:2014 ; number:2 ; pages:195-206

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/app4020195

Katalog-ID:	DOAJ016864549

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author	María del Valle Martínez de Yuso
spellingShingle	María del Valle Martínez de Yuso misc TA1-2040 misc QH301-705.5 misc QC1-999 misc QD1-999 misc Nafion misc ionic liquids misc XPS misc impedance spectroscopy misc contact angle misc hydrophobic character misc Technology misc T misc Engineering (General). Civil engineering (General) misc Biology (General) misc Physics misc Chemistry Chemical Surface, Thermal and Electrical Characterization of Nafion Membranes Doped with IL-Cations
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topic_title	TA1-2040 QH301-705.5 QC1-999 QD1-999 Chemical Surface, Thermal and Electrical Characterization of Nafion Membranes Doped with IL-Cations Nafion ionic liquids XPS impedance spectroscopy contact angle hydrophobic character
topic	misc TA1-2040 misc QH301-705.5 misc QC1-999 misc QD1-999 misc Nafion misc ionic liquids misc XPS misc impedance spectroscopy misc contact angle misc hydrophobic character misc Technology misc T misc Engineering (General). Civil engineering (General) misc Biology (General) misc Physics misc Chemistry
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title	Chemical Surface, Thermal and Electrical Characterization of Nafion Membranes Doped with IL-Cations
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title_sort	chemical surface, thermal and electrical characterization of nafion membranes doped with il-cations
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title_auth	Chemical Surface, Thermal and Electrical Characterization of Nafion Membranes Doped with IL-Cations
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.
abstractGer	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.
abstract_unstemmed	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.
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title_short	Chemical Surface, Thermal and Electrical Characterization of Nafion Membranes Doped with IL-Cations
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Chemical Surface, Thermal and Electrical Characterization of Nafion Membranes Doped with IL-Cations

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