纳米SiO_2/SPFEK复合质子交换膜的制备及性能

Preparation and Characterization of SiO_2/SPFEK Composite Proton Exchange Membrane

以自制的磺化聚芴醚酮和正硅酸乙酯为原料,采用溶胶凝胶(Sol-gel)法合成了掺杂纳米SiO2的复合质子交换膜,利用能量分散谱(EDS)线扫描、热失重分析法、扫描电镜对膜的结构、热稳定性、微观形态进行了表征。并考察了质子交换膜的各种性能。结果表明,纳米SiO2能提高膜的质子传导率和氧化稳定性能。当SiO2掺杂质量分数为9%时,复合膜的质子传导率在80℃时为5.96×10-2(S/cm),在80℃的Fenton’s试剂(3%的过氧化氢和2 mg/L的FeSO4)中进行氧化稳定性测试,膜在117 min时才开始碎裂,表现出良好的氧化稳定性。

A novel kind of composite proton exchange membrane using sol-gel method was prepared by doping orthosilicate into sulfonated poly（fluorenyl ether ketone）.The stability of the membranes was characterized with thermal gravity analysis（TGA）.The morphology of the membrane and the dispersion of elements in the cross section of the membrane were observed by the scanning electron microscope（SEM） and Energy Dispersive Spectrometer（EDS）.The results show the doped nano-SiO2 can improve the proton conductivity and oxidative stability of the membranes.The proton conductivity of the composite membrane with 9% SiO2 is up to 5.96×10-2（S/ cm） and it takes 117 min before the membrane started to break into small pieces in Fenton＇s reagent（3% H2O2＋2 mg/L FeSO4） at 80 ℃.