Qu Shuguo, Li Minhui, Zhang Chenchen, Sun Yuanyuan, Duan Jihai, Wang Weiwen, Li Jianlong, Li Xiaojin
Key Laboratory Reactions and Isolations of Muti-phases Liquid of Shandong Province, College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao 266042, Shandong, China.
Energy Storage Management and Equipment Group, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, Shandong, China.
Polymers (Basel). 2018 Dec 21;11(1):7. doi: 10.3390/polym11010007.
Nano-silicon dioxide (SiO₂) was incorporated into the matrix of sulfonated poly(ether ether ketone) (SPEEK)/ammonium ionic liquid (AIL) membranes by solution casting, with the aim of reducing ionic liquid leaching and any consequent decrease in proton conductivity. Fourier transform infrared (FTIR) spectra results indicate incorporation of the SPEEK matrix with AIL and nano-SiO₂. Scanning electron microscopy (SEM) and X⁻ray diffraction (XRD) images revealed that incorporation of nano-SiO₂ make the ternary composite membranes more flexible. The maximum ion exchange capacity (IEC) value was 3.25 meq/g, and the net structure formed by the nano-SiO₂ not only retarded AIL leaching, but also increased the proton conductivity of the composite membranes. AIL leaching from the membranes was between 20% and 30%, which was lower than that of the SPEEK/AIL membrane. The maximum proton conductivity for the SPEEK/AIL/SiO₂ membranes reached 10.73 mS/cm at 393 K.
通过溶液浇铸法将纳米二氧化硅（SiO₂）掺入磺化聚醚醚酮（SPEEK）/铵离子液体（AIL）膜的基质中，目的是减少离子液体的浸出以及随之而来的质子传导率的降低。傅里叶变换红外（FTIR）光谱结果表明SPEEK基质与AIL和纳米SiO₂发生了结合。扫描电子显微镜（SEM）和X射线衍射（XRD）图像显示，纳米SiO₂的掺入使三元复合膜更加柔韧。最大离子交换容量（IEC）值为3.25 meq/g，纳米SiO₂形成的网络结构不仅抑制了AIL的浸出，还提高了复合膜的质子传导率。膜中AIL的浸出率在20%至30%之间，低于SPEEK/AIL膜。SPEEK/AIL/SiO₂膜在393 K时的最大质子传导率达到10.73 mS/cm。
