NMR investigation of water and methanol mobility in nanocomposite fuel cell membranes

Isabella Nicotera; Ameesh Khalfan; Gabriel Goenaga; Tao Zhang; Andrew Bruce Bocarsly; Steve Greenbaum

doi:10.1007/s11581-007-0178-8

NMR investigation of water and methanol mobility in nanocomposite fuel cell membranes

Isabella Nicotera, Ameesh Khalfan, Gabriel Goenaga, Tao Zhang, Andrew Bruce Bocarsly, Steve Greenbaum

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

Water and methanol transport behavior, morphology, and solvent adsorption of filler-free Nafion membrane, Nafion-SiO₂, Nafion-TiO₂, and two Nafion-Zr(HPO₄)₂ composites were investigated using nuclear magnetic resonance methods, including spin-lattice relaxation and pulsed-field-gradient spin-echo diffusion conducted under both variable temperature and variable hydrostatic pressure conditions and scanning electron microscopy analysis. A comparison between water and methanol self-diffusion coefficients reveals that the water mobility is higher than the methanol mobility in all the membranes. Additionally, the inclusion of inorganic fillers improves both the solvent uptakes and the transport properties of the composite membranes relative to filler-free Nafion, with the exception of one of the Nafion-Zr(HPO₄)₂ composite. Nafion-Zr(HPO ₄)₂ composites were prepared by two different procedures, in situ and ex situ. Although phosphorus-31 magic-angle spinning nuclear magnetic resonance spectra show the same structures of the particles in both kinds of membranes, the morphology, solvent absorption properties, and solvent mobilities are very different.

Original language	English (US)
Pages (from-to)	243-253
Number of pages	11
Journal	Ionics
Volume	14
Issue number	3
DOIs	https://doi.org/10.1007/s11581-007-0178-8
State	Published - Jun 2008

All Science Journal Classification (ASJC) codes

General Chemical Engineering
General Materials Science
General Engineering
General Physics and Astronomy

Keywords

Composite electrolytes
Diffusion
Electron microscopies
NMR
PEMFCs

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title = "NMR investigation of water and methanol mobility in nanocomposite fuel cell membranes",

abstract = "Water and methanol transport behavior, morphology, and solvent adsorption of filler-free Nafion membrane, Nafion-SiO2, Nafion-TiO2, and two Nafion-Zr(HPO4)2 composites were investigated using nuclear magnetic resonance methods, including spin-lattice relaxation and pulsed-field-gradient spin-echo diffusion conducted under both variable temperature and variable hydrostatic pressure conditions and scanning electron microscopy analysis. A comparison between water and methanol self-diffusion coefficients reveals that the water mobility is higher than the methanol mobility in all the membranes. Additionally, the inclusion of inorganic fillers improves both the solvent uptakes and the transport properties of the composite membranes relative to filler-free Nafion, with the exception of one of the Nafion-Zr(HPO4)2 composite. Nafion-Zr(HPO 4)2 composites were prepared by two different procedures, in situ and ex situ. Although phosphorus-31 magic-angle spinning nuclear magnetic resonance spectra show the same structures of the particles in both kinds of membranes, the morphology, solvent absorption properties, and solvent mobilities are very different.",

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author = "Isabella Nicotera and Ameesh Khalfan and Gabriel Goenaga and Tao Zhang and Bocarsly, {Andrew Bruce} and Steve Greenbaum",

year = "2008",

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doi = "10.1007/s11581-007-0178-8",

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AU - Nicotera, Isabella

AU - Khalfan, Ameesh

AU - Goenaga, Gabriel

AU - Zhang, Tao

AU - Bocarsly, Andrew Bruce

AU - Greenbaum, Steve

PY - 2008/6

Y1 - 2008/6

N2 - Water and methanol transport behavior, morphology, and solvent adsorption of filler-free Nafion membrane, Nafion-SiO2, Nafion-TiO2, and two Nafion-Zr(HPO4)2 composites were investigated using nuclear magnetic resonance methods, including spin-lattice relaxation and pulsed-field-gradient spin-echo diffusion conducted under both variable temperature and variable hydrostatic pressure conditions and scanning electron microscopy analysis. A comparison between water and methanol self-diffusion coefficients reveals that the water mobility is higher than the methanol mobility in all the membranes. Additionally, the inclusion of inorganic fillers improves both the solvent uptakes and the transport properties of the composite membranes relative to filler-free Nafion, with the exception of one of the Nafion-Zr(HPO4)2 composite. Nafion-Zr(HPO 4)2 composites were prepared by two different procedures, in situ and ex situ. Although phosphorus-31 magic-angle spinning nuclear magnetic resonance spectra show the same structures of the particles in both kinds of membranes, the morphology, solvent absorption properties, and solvent mobilities are very different.

AB - Water and methanol transport behavior, morphology, and solvent adsorption of filler-free Nafion membrane, Nafion-SiO2, Nafion-TiO2, and two Nafion-Zr(HPO4)2 composites were investigated using nuclear magnetic resonance methods, including spin-lattice relaxation and pulsed-field-gradient spin-echo diffusion conducted under both variable temperature and variable hydrostatic pressure conditions and scanning electron microscopy analysis. A comparison between water and methanol self-diffusion coefficients reveals that the water mobility is higher than the methanol mobility in all the membranes. Additionally, the inclusion of inorganic fillers improves both the solvent uptakes and the transport properties of the composite membranes relative to filler-free Nafion, with the exception of one of the Nafion-Zr(HPO4)2 composite. Nafion-Zr(HPO 4)2 composites were prepared by two different procedures, in situ and ex situ. Although phosphorus-31 magic-angle spinning nuclear magnetic resonance spectra show the same structures of the particles in both kinds of membranes, the morphology, solvent absorption properties, and solvent mobilities are very different.

KW - Composite electrolytes

KW - Diffusion

KW - Electron microscopies

KW - NMR

KW - PEMFCs

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NMR investigation of water and methanol mobility in nanocomposite fuel cell membranes

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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