Structural and electrochemical investigation on re-cast Nafion membranes for polymer electrolyte fuel cells (PEFCs) application

Saccà, A.; Carbone, A.; Pedicini, R.; Portale, Giuseppe; D’Ilario, L.; Longo, A.; Martorana, Antonino; Passalacqua, E.

doi:10.1016/j.memsci.2005.10.047

Cited by 63 publications

(36 citation statements)

References 21 publications

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“…A small angle X-ray scattering study of re-cast Nafion membranes from dimethylacetammide solvent has also indicated the importance of casting conditions on the ionic conductivity and structure of proton exchange membranes [32]. The authors found that a larger distance between the water pools embedded in the polymer matrix and a larger diameter of the water clusters compared to corresponding, off-the-shelf Nafion NE-115 membranes were found.…”

Section: Resistance and Conductivity Measurementsmentioning

confidence: 99%

The Ionic Conductivity of a Nafion® 1100 Series of Proton‐exchange Membranes Re‐cast from Butan‐1‐ol and Propan‐2‐ol

et al. 2010

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The ionic conductivity of Nafion® 1100 extruded membranes re‐cast from solutions of butan‐1‐ol and propan‐2‐ol is measured in 0.5 mol dm–3 H2SO4 at 295 K, using an immersed, four‐electrode d.c. technique. The general trend is an increasing conductivity for the thicker membranes. Materials which were solution‐cast from butan‐1‐ol yielded the highest conductivity while a series of membranes with lower conductivities (similar to those of an extruded Nafion® 1100 series of membranes) was found using propan‐2‐ol. The conductivity results indicate that membranes manufactured by extrusion and casting from various solvents might have different structures. Differences in the water content and conductivity of the membranes are considered to arise from the impact of processing conditions on the surface and bulk structure of the membranes.

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Section: Resistance and Conductivity Measurementsmentioning

confidence: 99%

The Ionic Conductivity of a Nafion® 1100 Series of Proton‐exchange Membranes Re‐cast from Butan‐1‐ol and Propan‐2‐ol

et al. 2010

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“…The origin of the "ionomeric peak" has been extensively studied but it is still subjected to controversy [38][39][40]. However, irrespective of the model adopted to describe the morphology of clusters domains (i.e., spherical, cylindrical, or planar), it is well accepted that the d-spacing determined by the position of the ionomeric peak as 2p/q represents the separation distance between hydrophilic and hydrophobic domains.…”

Section: Chemical and Morphological Characterization Of Nafionzeolitementioning

confidence: 99%

Transport Properties of Zeolite Na‐X–Nafion Membranes: Effect of Zeolite Loadings and Particle Size

Lavorgna¹,

Sansone²,

Scherillo³

et al. 2011

Fuel Cells

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Na-X zeolites particles, synthesized in two size ranges,\ud namely 200–300 nm and 30–100 nm, were used to prepare\ud Nafion/Na-X zeolite composite membranes by recast\ud method. The physical, chemical, and morphological properties\ud of the zeolite powders and composite membranes were\ud examined by XRD, N2 adsorption isotherms, FTIR, SEM,\ud and SAXS analysis. Furthermore, the effect of zeolite particles\ud size and loadings (i.e., 5 and 10% w/w) on the water,\ud methanol, and proton transport properties was investigated.\ud It has been found that the size of the Na-X zeolite particles\ud plays a key role in the proton and methanol transport\ud behavior since it rules the zeolite hydrophilic behavior, the\ud morphology of polymer–filler interphase, and also the nature\ud of water established in the composite membrane.\ud The results show that the membranes loaded with a 5%\ud w/w of submicron-sized Na-X zeolite exhibit a proton conductivity\ud and selectivity significantly higher than Nafion. In\ud particular the proton conductivity at 120 °C is around eight\ud times and the selectivity at 25 °C is around 40% higher than\ud those exhibited by recast Nafion

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“…After an evaporation step of the original solution by Rotavapor, the resulting dry residue was diluted with dimethylacetamide (DMAc, Aldrich) as an organic solvent to obtain a 10% w/w solution, as described elsewhere [30]. Two composite membranes containing the developed inorganic fillers were prepared by bulk mechanical mixing of HPW/Zr powders in the polymer Nafion solution through an optimised procedure [31,32].…”

Section: Membrane Preparationmentioning

confidence: 99%

Phosphotungstic Acid Supported on a Nanopowdered ZrO₂ as a Filler in Nafion‐Based Membranes for Polymer Electrolyte Fuel Cells

et al. 2008

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An inorganic filler prepared by impregnation of phosphotungstic heteropolyacid on zirconia (HPW/Zr) was developed to be inserted into a perfluorosulphonic polymer matrix for a polymer electrolyte fuel cell (PEFC) operating at a medium temperature (80–120 °C) and low relative humidity (RH). Two different phosphotungstic acid (PWA) loadings (30 and 45% w/w) were anchored on a nanopowdered ZrO2. Such compounds were characterised by different techniques: differential scanning calorimetry (DSC), X‐ray diffraction (XRD), energy dispersive X‐ray analysis (EDX) and porosity and surface area by Brunauer–Emmett–Teller (BET), to verify the introduction and anchorage of PWA on ZrO2. Two composite Nafion membranes were prepared and characterised in terms of chemical–physical characteristics and electrochemical tests. Thermogravimetric analysis (TGA) provided evidence that HPW/Zr had been incorporated into composite membranes and it was not eluted. A good proton conductivity of about 6 × 10–3 S cm–1 at 120 °C and 25% RH was recorded.Accelerated in situ ageing tests highlighted a good electrochemical stability (more than 150 cycles at 90 °C with dry gases) of the composite membranes with a slow decay and a reasonable integrity of the analysed membrane‐electrodes assembly (MEA). Finally, a post‐mortem SEM–EDX analysis on MEAs confirmed the presence of HPW/Zr in the membrane after the in situ testing.

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Structural and electrochemical investigation on re-cast Nafion membranes for polymer electrolyte fuel cells (PEFCs) application

Cited by 63 publications

References 21 publications

The Ionic Conductivity of a Nafion® 1100 Series of Proton‐exchange Membranes Re‐cast from Butan‐1‐ol and Propan‐2‐ol

The Ionic Conductivity of a Nafion® 1100 Series of Proton‐exchange Membranes Re‐cast from Butan‐1‐ol and Propan‐2‐ol

Transport Properties of Zeolite Na‐X–Nafion Membranes: Effect of Zeolite Loadings and Particle Size

Phosphotungstic Acid Supported on a Nanopowdered ZrO₂ as a Filler in Nafion‐Based Membranes for Polymer Electrolyte Fuel Cells

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Structural and electrochemical investigation on re-cast Nafion membranes for polymer electrolyte fuel cells (PEFCs) application

Cited by 63 publications

References 21 publications

The Ionic Conductivity of a Nafion® 1100 Series of Proton‐exchange Membranes Re‐cast from Butan‐1‐ol and Propan‐2‐ol

The Ionic Conductivity of a Nafion® 1100 Series of Proton‐exchange Membranes Re‐cast from Butan‐1‐ol and Propan‐2‐ol

Transport Properties of Zeolite Na‐X–Nafion Membranes: Effect of Zeolite Loadings and Particle Size

Phosphotungstic Acid Supported on a Nanopowdered ZrO2 as a Filler in Nafion‐Based Membranes for Polymer Electrolyte Fuel Cells

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Phosphotungstic Acid Supported on a Nanopowdered ZrO₂ as a Filler in Nafion‐Based Membranes for Polymer Electrolyte Fuel Cells