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A high degree sulfonated poly(ether ether ketone) blend with polyvinylidene fluoride improves mechanical properties and proton conductivity, making it a potential proton-conducting membrane fuel cell.

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What they did

System
MEC

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Abstract

Sulfonated poly(ether ether ketone) (sPEEK) membrane is a promising proton-conducting membrane for fuel cell. However, the performance and lifetime of sPEEK membrane depend on the degree of sulfonation (DS). High DS of sPEEK increases the performance, but the mechanical properties could deteriorate progressively which affect its lifetime. Thus, this study investigated the effect of adding polyvinylidene fluoride (PVDF) into high DS (80%) of sPEEK through solution blending method toward its physicochemical properties and morphology structures. The PVDF concentration was varied to 5, 10, 15, and 20 wt% relative to the sPEEK content. The existence of hydrophobic PVDF in 80% sPEEK improved the mechanical properties where the water uptake and swelling degree of membrane decreased, whereas the tensile strength increased. The sPEEK/PVDF 15 exhibited the highest proton conductivity (46.23 mS cm −1 ) at 80°C. Incorporating PVDF into high DS of sPEEK enhanced the mechanical properties which can be used as a proton-conducting membrane for fuel cell that may improve the performance and prolong the lifetime of the cell.

Key findings

  • High degree sulfonation (80%) of sPEEK increases performance but deteriorates mechanical properties.
  • Adding PVDF to sPEEK improves mechanical properties, including reduced water uptake and swelling degree.
  • The sPEEK/PVDF 15 blend exhibits the highest proton conductivity (46.23 mS cm⁻¹) at 80°C.

Keywords

Polyvinylidene fluorideMembraneEtherProton exchange membrane fuel cellUltimate tensile strengthChemical engineering

Identifiers

DOI
10.1177/0954008319853337
Journal
High Performance Polymers
Year
2019