期刊
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
卷 68, 期 7, 页码 1197-1204出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jccs.202000535
关键词
mesoporous silica nanoparticles; phosphotungstic acid; proton conductivity; proton exchange membrane
资金
- China Merchant Offshore Technology Research Center [CMRD-B038]
- China National Key Research and development Plan Project [2016YFC0303705]
- Science Foundation of China University of Petroleum, Beijing [ZX20200097]
Incorporating phosphotungstic acid into sulfonated poly(ether ether ketone) using surface-modified silica nanoparticles improved proton conductivity in the composite membrane. The composite membrane showed excellent proton conductivity and stability due to increased dispersion of the nanoparticles.
Incorporating acid proton carriers into a polymer matrix is an effective way to improve proton conductivity, but the immobilization of acids is a problem. In this work, mesoporous silica nanoparticles (MSNs) incorporating phosphotungstic acid (HPW) into sulfonated poly(ether ether ketone) (SPEEK) improved the conductivity of the proton exchange membrane. Meanwhile, the surface of the MSNs was aminated, and the ion interaction with SPEEK was established to increase the dispersion of MSNs. Composite membranes doped with surface-modified silica (K-MSNs) have excellent proton conductivity and conductivity stability. When the K-MSNs content was 1 wt%, the proton conductivity of the composite membrane reached 243 mS/cm at 60 degrees C. After 240 hr of immersion at 60 degrees C, proton conductivity was retained at 210 mS/cm. Compared with MSNs, K-MSNs has a large number of amino groups on its surface, which can effectively reduce the loss of HPW.
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