Preparation and performance of a Nafion®/montmorillonite nanocomposite membrane for direct methanol fuel cell

Jung, Doo‐Hwan; Cho, S.Y.; Peck, Dong Hyun; Shin, Dong-Ryul; Kim, Jeong Soo

doi:10.1016/s0378-7753(03)00095-8

Cited by 237 publications

(97 citation statements)

References 11 publications

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“…L/W is the anisotropy factor. In a previous study, we have shown that although nanoclays resist complete exfoliation within Nafion ® [14,15], the methanol permeability of this polymer is decreased by the multi-layered alumino-silicate. This preliminary observation is a strong incentive to model a situation in which the alumino-silicate would be completely delaminated within a polymer usable as a fuel cell membrane.…”

Section: Fig 1 the Typical Dispersion States Of A Nanoclay Within Amentioning

confidence: 87%

Contribution of nanoclays to the barrier properties of a model proton exchange membrane for fuel cell application

Thomassin

Pagnoulle

Caldarella

et al. 2006

Journal of Membrane Science

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Direct methanol fuel cells (DMFCs) that use a proton exchange membrane (PEM) as electrolyte, is a promising alternative source of energy for the future. However, methanol crossover from the anodic side to the cathodic one is a major problem in DMFC. Proper dispersion of layered silicates within the fuel cell membrane has been proposed as a strategy for improving the barrier properties of the membrane. The validity of this approach has been tested in case of a model membrane consisting of phosphotungstic acid doped poly(vinyl alcohol). A solvent casting technique has been used, which allows the nanofiller to be delaminated by an ultrasonic pretreatment, as confirmed by TEM and XRD analysis. The layered silicates have a favourable impact on the methanol permeability, whose the decrease overcompensates some loss in ionic conductivity.

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Section: Fig 1 the Typical Dispersion States Of A Nanoclay Within Amentioning

confidence: 87%

Contribution of nanoclays to the barrier properties of a model proton exchange membrane for fuel cell application

Thomassin

Pagnoulle

Caldarella

et al. 2006

Journal of Membrane Science

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“…Preferential sorption of water versus methanol and an increased path tortuosity for mass transport result in lower methanol permeabilities for the hybrid membranes [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite SPEEK-based membranes for Direct Methanol Fuel Cells at intermediate temperatures

Mollá

Compañ

2015

Journal of Membrane Science

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Novel nanocomposite membranes were prepared by infiltration of a blend of sulfonated PEEK (SPEEK) with polyvinyl alcohol (PVA), using water as solvent, into electrospun nanofibers of SPEEK blended with polyvinyl butyral (PVB). The membranes were characterized for their application on Direct Methanol Fuel Cells (DMFCs) operating at moderate temperatures (>80 ºC). An important role of the solvent on the crosslinking temperature for the SPEEK-PVA system was observed. A mat of hydrated SPEEK-30%PVB nanofibers revealed a higher proton conductivity in comparison with a dense membrane of similar composition. Incorporation of the nanofiber mats to the SPEEK-35%PVA matrix provided mechanical stability, methanol barrier properties and certain proton conductivity up to a crosslinking temperature of 120 ºC. Not remarkable effect of the nanofibers was found above that crosslinking temperature. The combined effect of the nanofibers and crosslinking temperature on the properties of the membranes is discussed. DMFC performance experiments concluded promising results for this new low-cost type of membranes, although further optimization steps are still required.

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“…Recently, multi-layered alumino-silicates, mainly montmorillonite (MMT), have been used to improve the performances of Nafion ® [21][22][23][24][25] and SPEEK fuel cell membranes [26] with a special effort for decreasing the methanol permeability. Indeed, several studies showed that addition of this type of nanofiller is able to improve the barrier properties of several polymers towards various gases, as result of a high length-to-width ratio of the additive.…”

Section: Introductionmentioning

confidence: 99%

“…However, the addition of multi-layered alumino-silicates results in decreased ionic conductivity in parallel to lower methanol permeability [21][22][23][24]. Rhee et al have proposed to overcome this drawback by grafting an organic sulfonic acid containing compound onto the surface of the alumino-silicates layers by silane condensation [25].…”

Section: Introductionmentioning

confidence: 99%

Impact of acid containing montmorillonite on the properties of Nafion® membranes

Thomassin

Pagnoulle

Caldarella

et al. 2005

Polymer

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The counter-ions of montmorillonite have been exchanged for ammonium cations containing either a sulfonic acid or a carboxylic acid in order to improve the performances of sulfonated membranes in direct methanol fuel cell. These layered silicates have been dispersed within Nafion ® by solution mixing. Comparison with conventional organo-modified montmorillonite (Cloisite 30B) shows that the incorporation of carboxylic acid in the clay galleries improves the filler dispersion and, consequently, the methanol barrier properties. Moreover, the negative impact of Cloisite 30B on the ionic conductivity is restricted.

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Preparation and performance of a Nafion®/montmorillonite nanocomposite membrane for direct methanol fuel cell

Cited by 237 publications

References 11 publications

Contribution of nanoclays to the barrier properties of a model proton exchange membrane for fuel cell application

Contribution of nanoclays to the barrier properties of a model proton exchange membrane for fuel cell application

Nanocomposite SPEEK-based membranes for Direct Methanol Fuel Cells at intermediate temperatures

Impact of acid containing montmorillonite on the properties of Nafion® membranes

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