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Covalent-ionically cross-linked polyetheretherketone proton exchange membrane for direct methanol fuel cell

Authors
Journal
Journal of Power Sources
0378-7753
Publisher
Elsevier
Publication Date
Volume
195
Issue
16
Identifiers
DOI: 10.1016/j.jpowsour.2010.03.023
Keywords
  • Cross-Linked
  • Sspeek-Wc
  • Water Uptake
  • Proton Conductivity
  • Proton Exchange Membrane
  • Direct Methanol Fuel Cell

Abstract

Abstract In this paper, the proton exchange membrane prepared by covalent-ionically cross-linking water soluble sulfonated–sulfinated poly(oxa- p-phenylene-3,3-phthalido- p-phenylene-oxa- p-phenylene-oxy-phenylene) (SsPEEK-WC) is reported. Compared with covalent cross-linked PEEK-WC membrane, this covalent-ionically cross-linked PEEK-WC membrane exhibits extremely reduced water uptake and methanol permeability, but just slightly sacrificed proton conductivity. The proton conductivity of the covalent-ionically cross-linked PEEK-WC membrane reaches to 2.1 × 10 −2 S cm −1 at room temperature and 4.1 × 10 −2 S cm −1 at 80 °C. The methanol permeability is 1.3 × 10 −7 cm 2 s −1, 10 times lower than that of Nafion ® 117 membrane. The results suggest that the covalent-ionically cross-linked PEEK-WC membrane is a promising candidate for direct methanol fuel cell because of low methanol permeability and adequate proton conductivity.

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