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AgI复合材料因其在电化学器件上的潜在应用而受到越来越多的关注.本文介绍采用浸渍热扩散的方法制备有序介孔氧化硅SBA-15/纳米AgI复合材料,对复合材料进行了XRD、TEM、SEM及交流阻抗谱分析表征.结果发现两相复合后AgI的离子电导率提高了约2个量级、相变温度也有较大改变.我们用界面空间电荷区模型解释了离子电导率的提高机理及用同质晶核间表面张力、弹性剪切力理论对相变温度的滞后机理给予了解析.
AgI composites are attracting more and more attentions due to their potential application in electrochemical devices.In this paper, the ordered mesoporous silica SBA-15 / nano-AgI composites were prepared by impregnation thermal diffusion, XRD, TEM, SEM and AC impedance spectroscopy were used to characterize the ionic conductivity of AgI. The results showed that the ionic conductivity of AgI increased about two orders of magnitude and the phase transition temperature also changed greatly.We used the interfacial space charge region model to explain the ionic conductivity The improvement mechanism of electrical conductivity and the theory of surface tension and elastic shear force between homogeneous nuclei are used to analyze the hysteresis mechanism of phase transition temperature.