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Investigation of sulfonated poly(ether ether ketone sulfone)/heteropolyacid composite membranes for high temperature fuel cell applications

Authors

  • Zhe Wang,

    1. Alan G. MacDiarmid Institiute, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China
    2. Changchun University of Technology, Changchun 130012, People's Republic of China
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  • Hongzhe Ni,

    1. Alan G. MacDiarmid Institiute, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China
    2. Changchun University of Technology, Changchun 130012, People's Republic of China
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  • Chengji Zhao,

    1. Alan G. MacDiarmid Institiute, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China
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  • Xianfeng Li,

    1. Alan G. MacDiarmid Institiute, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China
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  • Tiezhu Fu,

    1. Alan G. MacDiarmid Institiute, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China
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  • Hui Na

    Corresponding author
    1. Alan G. MacDiarmid Institiute, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China
    • Alan G. MacDiarmid Institiute, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China
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Abstract

The sulfonated poly(ether ether ketone sulfone) (SPEEKS)/heteropolyacid (HPA) composite membranes with different HPA content in SPEEKS copolymers matrix with different degree of sulfonation (DS) were investigated for high temperature proton exchange membrane fuel cells. Composite membranes were characterized by Fourier transfer infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). FTIR band shifts suggested that the sulfonic acid groups on the copolymer backbone strongly interact with HPA particles. SEM pictures showed that the HPA particles were uniformly distributed throughout the SPEEKS membranes matrix and particle sizes decreased with the increment of copolymers' DS. The holes were not found in SPEEKS-4/HPA30 (consisting of 70% SPEEKS copolymers with DS = 0.8 and 30% HPA) composite membrane after composite membranes were treated with boiling water for 24 h. Thermal stabilities of the composite membranes were better than those of pure sulfonated copolymers membranes. Although the composite membranes possessed lower water uptake, it exhibited higher proton conductivity for SPEEKS-4/HPA30 especially at high temperature (above 100 °C). Its proton conductivity linearly increased from 0.068 S/cm at 25 °C to 0.095 S/cm at 120 °C, which was higher than 0.06 S/cm of Nafion 117. In contrast, proton conductivity of pure SPEEKS-4 membrane only increased from 0.062 S/cm at 25 °C to 0.078 S/cm at 80 °C. At 120 °C, proton conductivity decreased to poor 0.073 S/cm. The result indicated that composite membranes exhibited high proton conductivity at high temperature. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 1967–1978, 2006

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