UiO-66衍生物孔结构调控对其质子传导性能的影响

Effect of pore structure regulation of UiO-66 derivatives on proton conductivity

基于微孔UiO-66-NH_(2)合成体系采用水诱导的方法制备出具有多级孔结构的UiO-66-NH_(2),后经修饰处理制备出含有不同基团的多级孔UiO-66-X衍生物,并对所制材料的质子传导性能进行了研究。采用X-射线粉末衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、N_(2)吸附-脱附及傅里叶变换红外光谱(FT-IR)对所制材料的物化性质进行详细表征,并揭示了UiO-66-X衍生物的孔结构和基团类型对质子传导性能的影响。结果表明,具有多级孔结构的UiO-66-X衍生物可吸附较多水分子形成氢键网络以促进其质子迁移,同时,含较多质子源和质子跳跃位点数目的基团也可增强质子传导。在温度为60℃、相对湿度为93%的实验条件下,Hier-UiO-66-IM表现出最优的质子传导性能。

Hierarchical porous UiO-66-NH_(2) was prepared by water-induced method based on microporous UiO-66-NH_(2) synthesis system,and hierarchical porous Uio-66-X derivatives containing different groups were prepared by modification.The proton conductivity of the prepared materials was studied.X-ray powder diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),N,adsorption-desorption and Fourier transform infrared spectroscopy(FT-IR)were used to characterize the physicochemical properties of the prepared materials.It was revealed that the effects of pore structure and group types on the proton conductivity of the UiO-66-X derivatives.The results showed that the UiO-66-X derivatives with hierarchical pore structure could adsorb more water molecules to form hydrogen bond network to promote proton migration,and the groups with more proton sources and proton hopping sites could also enhance proton conduction.At a temperature of 60 C and a relative humidity of 93%,Hier-UiO-66-IM material showed the excellent proton conductivity.