Abstract
The rod-like silica was modified by silane coupling agent to load phosphotungstic acid (HPW@K-r-SiO2). The interaction between HPW and K-r-SiO2 was verified by X-ray photoelectron spectroscopy (XPS) and Fourier Transform Infrared (FTIR). The SPEEK/HPW@K-r-SiO2-1.0 composite membrane exhibits outstanding performance, such as the improved dimensional stability, proton conductivity and conductivity stability. Compared with SPEEK/HPW, the swelling ratio of SPEEK/HPW@K-r-SiO2-1.0 decreased by 22.2% at 20°C and 7.2% at 60°C. The proton conductivity of SPEEK/HPW@K-r-SiO2-1.0 reaches 203.8 mS cm−1 at 60°C. The activation energy is 7.8% lower than SPEEK/HPW. The proton conductivity decreased by 3.5% after 240 h at 60°C and was 5.8 times lower than that of SPEEK/HPW membrane.
Published Version
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