Acid-functionalized silica-Nafion composite membranes with high proton conductivity

Kui Xu, Mattrew R. Gadinski, Michael Anthony Hickner, Qing Wang

Research output: Contribution to journalConference article

Abstract

A series of new Nafion based composite membranes have been prepared via a in-situ sol-gel reaction of 3-(trihydroxylsilyl)propane-1-sulfonic acid and solution casting method. The morphological structure, ion-exchange capacity, water uptake, proton conductivity and methanol permeability of the resulting composite membranes have been extensively investigated as functions of the content of sulfopropylated polysilsesquioxane filler, temperature and relative humidity. Unlike the conventional Nafion/silica composites, the prepared membranes exhibit an increased water uptake and associated enhancement in proton conductivity compared to unmodified Nafion. In particular, considerably high proton conductivities at 80 and 120 °C under 30% relative humidity have been demonstrated in the composite membranes, which are over two times greater than Nafion. Apart from a remarkable improvement in proton conductivity, the composite membranes display lower methanol permeability in comparison with plain Nafion.

Original languageEnglish (US)
JournalACS National Meeting Book of Abstracts
StatePublished - Dec 1 2010
Event239th ACS National Meeting and Exposition - San Francisco, CA, United States
Duration: Mar 21 2010Mar 25 2010

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Proton conductivity
Composite membranes
Silicon Dioxide
Silica
Acids
Atmospheric humidity
Methanol
Propane
Sulfonic Acids
Water
Sol-gels
Fillers
Ion exchange
Casting
Membranes
perfluorosulfonic acid
Composite materials
Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

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title = "Acid-functionalized silica-Nafion composite membranes with high proton conductivity",
abstract = "A series of new Nafion based composite membranes have been prepared via a in-situ sol-gel reaction of 3-(trihydroxylsilyl)propane-1-sulfonic acid and solution casting method. The morphological structure, ion-exchange capacity, water uptake, proton conductivity and methanol permeability of the resulting composite membranes have been extensively investigated as functions of the content of sulfopropylated polysilsesquioxane filler, temperature and relative humidity. Unlike the conventional Nafion/silica composites, the prepared membranes exhibit an increased water uptake and associated enhancement in proton conductivity compared to unmodified Nafion. In particular, considerably high proton conductivities at 80 and 120 °C under 30{\%} relative humidity have been demonstrated in the composite membranes, which are over two times greater than Nafion. Apart from a remarkable improvement in proton conductivity, the composite membranes display lower methanol permeability in comparison with plain Nafion.",
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Acid-functionalized silica-Nafion composite membranes with high proton conductivity. / Xu, Kui; Gadinski, Mattrew R.; Hickner, Michael Anthony; Wang, Qing.

In: ACS National Meeting Book of Abstracts, 01.12.2010.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Acid-functionalized silica-Nafion composite membranes with high proton conductivity

AU - Xu, Kui

AU - Gadinski, Mattrew R.

AU - Hickner, Michael Anthony

AU - Wang, Qing

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N2 - A series of new Nafion based composite membranes have been prepared via a in-situ sol-gel reaction of 3-(trihydroxylsilyl)propane-1-sulfonic acid and solution casting method. The morphological structure, ion-exchange capacity, water uptake, proton conductivity and methanol permeability of the resulting composite membranes have been extensively investigated as functions of the content of sulfopropylated polysilsesquioxane filler, temperature and relative humidity. Unlike the conventional Nafion/silica composites, the prepared membranes exhibit an increased water uptake and associated enhancement in proton conductivity compared to unmodified Nafion. In particular, considerably high proton conductivities at 80 and 120 °C under 30% relative humidity have been demonstrated in the composite membranes, which are over two times greater than Nafion. Apart from a remarkable improvement in proton conductivity, the composite membranes display lower methanol permeability in comparison with plain Nafion.

AB - A series of new Nafion based composite membranes have been prepared via a in-situ sol-gel reaction of 3-(trihydroxylsilyl)propane-1-sulfonic acid and solution casting method. The morphological structure, ion-exchange capacity, water uptake, proton conductivity and methanol permeability of the resulting composite membranes have been extensively investigated as functions of the content of sulfopropylated polysilsesquioxane filler, temperature and relative humidity. Unlike the conventional Nafion/silica composites, the prepared membranes exhibit an increased water uptake and associated enhancement in proton conductivity compared to unmodified Nafion. In particular, considerably high proton conductivities at 80 and 120 °C under 30% relative humidity have been demonstrated in the composite membranes, which are over two times greater than Nafion. Apart from a remarkable improvement in proton conductivity, the composite membranes display lower methanol permeability in comparison with plain Nafion.

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