Fabrication of sulfonated poly(ether ether ketone ketone) membranes with high proton conductivity

Li, Xianfeng; Hao, Xiufeng; Xu, Dan; Zhang, Gang; Zhong, Shuangling; Na, Hui; Wang, Dayang

doi:10.1016/j.memsci.2006.06.002

Cited by 51 publications

(21 citation statements)

References 11 publications

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“…These results are in agreement with the literature, 62,64 where it is found that the proton conductivity of SPEEK nanober mat is nearly ve times as high as that of the SPEEK composite membrane. Our result is also consistent with the work of Hongwei et al, 62 where two possible pathways are presented: (1) the long-range proton conductivity pathways are formed inside of the nanobers, 65 and (2) the long-range proton conductivity pathways are formed on the surfaces of the nanobers.…”

Section: 9supporting

confidence: 93%

Conductivity of composite membrane-based poly(ether-ether-ketone) sulfonated (SPEEK) nanofiber mats of varying thickness

et al. 2016

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Nanofiber mats of SPEEK 70wt% -PVB 30 wt% (polyvinyl butyral)-based composite membranes were prepared by varying the electrospinning time in order to obtain mats with different thicknesses. These mats were embedded in SPEEK 65wt% -PVA 35wt% (polyvinyl alcohol) polymer solution to fill the pores in the fibers. The obtained membranes with different mat thicknesses have been characterized by water uptake, ionic exchange capacity, scanning electron microscopy, mechanical properties and proton conductivity.Microtensile test studies reveal that the maximum tensile strength increases as the thickness of the SPEEK-PVB nanofiber mats increases, resulting in more flexible composite membranes compared to a pure SPEEK-PVA membrane obtained by casting. The proton conductivity occurs more easily through the nanofiber than through the matrix phase, and the best conductivity (0.038 S cm À1) was measured at 120 C for the composite membrane of SPEEK-PVB nanofiber mats obtained after 12 hours of electrospinning time. This value suggests that our composite membranes have high potential to function in the temperature range between 100 and 140 C without losing their strength and while maintaining their high proton conductivity, making them an excellent candidate for fuel cells that operate at intermediate temperatures.

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Section: 9supporting

confidence: 93%

Conductivity of composite membrane-based poly(ether-ether-ketone) sulfonated (SPEEK) nanofiber mats of varying thickness

et al. 2016

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“…Then, apparently, reduction of surface concentration of water molecules and sulfonic acid groups on the SPEEK-30%PVB nanofibers strongly affects their conductivity properties as a consequence of a more limited proton conduction via the water-sulfonic acid association. This conclusion about conductivity preferentially taking place on the nanofibers surface would be in agreement with those reported in other studies [32,63]. Moreover, this explanation can be supported by the fact that nanofiber axis orientation is perpendicular to the proton conduction direction, which might difficult conductivity through the nanofiber bulk but on the nanofiber surface.…”

Section: Proton Conductivitysupporting

confidence: 92%

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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“…It is interesting to note that recently published work on sulfonated PEEKK electrospun mats reported opposite results, where the spherical morphology was by far more conductive than both the fiber morphology or cast films (those being similarly conductive) 11. According to the interpretation proposed by the authors, the sulfonate groups were located at the surface of the spheres in the case of the spherical morphology and the conductivity was then only a surface phenomenon.…”

Section: Resultsmentioning

confidence: 90%

“…Kim et al10 demonstrated the deposition of electrospun Nafion nanofibers on both sides of a PEM membrane in order to increase the surface area, however, they did not report any conductivity data. Li et al11 reported a proton conductivity of 0.37 S · cm −1 for electrospun mats of sulfonated poly(ether ether ketone ketone) (SPEEKK), 37 times higher than SPEEKK membranes prepared by casting.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Ionic Conducting Nanofibers

Laforgue

Robitaille

Mokrini

et al. 2007

Macro Materials & Eng

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The electrospinning method was used to fabricate nanostructures of Nafion‐poly(vinyl alcohol) (PVA) and Nafion‐poly(ethylene oxide) (PEO). Depending on the ratio between the two polymers, nanospheres and/or nanofibers could be obtained in a reproducible manner. The Nafion‐PVA mats were found to be more conductive than the Nafion‐PEO ones, possibly because of their better mechanical properties when swollen by water. The fiber morphology was always found to be more conductive than the sphere morphology. However, all electrospun mats presented ionic conductivities slightly lower than extruded Nafion 115 or Nafion‐PVA cast films.magnified image

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Fabrication of sulfonated poly(ether ether ketone ketone) membranes with high proton conductivity

Cited by 51 publications

References 11 publications

Conductivity of composite membrane-based poly(ether-ether-ketone) sulfonated (SPEEK) nanofiber mats of varying thickness

Conductivity of composite membrane-based poly(ether-ether-ketone) sulfonated (SPEEK) nanofiber mats of varying thickness

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

Fabrication and Characterization of Ionic Conducting Nanofibers

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