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Proton Conducting Composite Membranes from Sulfonated Polyether Ether Ketone and SiO_2 被引量:1
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作者 张高文 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第1期95-99,共5页
Proton conducting composite membranes from sulfonated polyether ether ketone and SiO2 for direct methanol fuel cell (DMFC) application were prepared with sulfonated polyether ether ketone(SPEEK) and tetracethoxy s... Proton conducting composite membranes from sulfonated polyether ether ketone and SiO2 for direct methanol fuel cell (DMFC) application were prepared with sulfonated polyether ether ketone(SPEEK) and tetracethoxy silane(TEOS) by sol-gel method. The covalent crosslinking structure was formed between —SO3H of SPEEK via SiO2. The SEM images show that the interfacial compatibility of SPEEK and SiO2 is improved obviously and SiO2 disperses uniformly in the polymer matrix and the particle diameter of SiO2 does not exceed 40 nm. The proton conductivity of composite membranes decreases slightly compared with the SPEEK membrane while the methanol permeability and swelling of composite membrane are improved remarkablely owing to covalent cross-linking between —SO3H and SiO2 . 展开更多
关键词 direct methanol fuel cell sulfonated polyether ether ketone sol-gel method proton conductivity methanol permeability
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High Proton Conducting SPEEK/SiO_2/ PWA Composite Membranes for Direct Methanol Fuel Cells
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作者 张高文 刘嘉宁 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第3期417-421,共5页
Sulfonated polyether ether ketone (SPEEK) based composite membranes for direct methanol fuel cell (DMFC) application were prepared by sol-gel reaction of tetraethoxysilane (TEOS) in the SPEEK matrix and the inco... Sulfonated polyether ether ketone (SPEEK) based composite membranes for direct methanol fuel cell (DMFC) application were prepared by sol-gel reaction of tetraethoxysilane (TEOS) in the SPEEK matrix and the incorporation of phosphotungstic acid (PWA).The conductivity of the developed membranes was determined by impedance spectroscopy and the methanol permeability through the membranes was obtained from diffuseness experiments.The SEM images show that the addition of SiO2 and the covalent cross-linking structure lead to fine PWA particles and more uniformly dispersion.The swelling of composite membranes remains in the range of 5%-8% at 30-90 ℃ and the effusion of PWA reduces significantly.The composite membranes show a good balance in higher proton conductivity and lower methanol permeation.The cell with composite membrane has higher open circuit voltage(0.728 V) and higher peak power density(45 mW/cm2) than that with Nafion117. 展开更多
关键词 direct methanol fuel cell sulfonated polyether ether ketone sol-gel method PWA SiO2
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