High Proton Conducting SPEEK/SiO_2/ PWA Composite Membranes for Direct Methanol Fuel Cells  

作　　者：张高文 刘嘉宁 

机构地区：[1]College of Chemistry and Environment,Hubei University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2011年第3期417-421,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by Ministry of Education, Hubei, China (No.Q20091403)

摘　　要：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.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.

关 键 词：direct methanol fuel cell sulfonated polyether ether ketone sol-gel method PWA SiO2 

分 类 号：TB332[一般工业技术—材料科学与工程] TM911.4[电气工程—电力电子与电力传动]