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Author(s): |
Pei-hua Chen, College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China
Chao Yang, College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China
Xue-hao Lin, Shenzhen Meixin Electronics Co. Ltd, Shenzhen 518000, P. R. China
Zhen-tao Zhou, College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China |
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Abstract: |
In order to study the properties and structure of Sulfonated-poly(ether ether-ketone)/Silica/(SPEEK/SiO2) composite proton exchange membranes（PEM） prepared by ball milling for direct methanol fuel cell （DMFC）application,SPEEK/SiO2 Inorganic-Organic composite membranes were prepared with sulfonation degree 75% SPEEK matrix and SiO2 inorganic phase by ball milling.The properties of composite membranes such as conductivity、methanol permeability、swelling properties 、 mechanical properties、SEM and IR were also characterized.The results suggested that SPEEK/SiO2 composite membranes showed a very low methanol permeability,changed between 1.15×10-8～1.38×10-7cm2/s ,which was as much as 1-2 orders lower than commercial Nafion117 membranes. Composite membranes also exhibited good performance of anti-swelling,its water absorption was only 16.5% and swelling ratio declined to 4.1% at 30℃.The tensile strength of composite membranes with 15wt% SiO2 reached 45.3MPa showed the good mechanical properties of composite membranes.Although the proton conductivity decreased after the addition of SiO2,the proton conductivity was still up to 9.6×10-3S/cm with 5wt% SiO2 at 80 ℃.SEM and IR showed that fine SiO2 particles cross-linked and distributed homogeneously in SPEEK ,and there was no agglomerate in composite membrane in SEM image.
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