【作者】 崔铮； 相艳； 张涛；

【Author】 Zheng Cui, Yan Xiang*, Tao Zhang* School of Material Science and Technology, Beihang University, Beijing, 100083

【机构】 北京航空航天大学材料科学与工程学院；

【Abstract】 The proton conductivities of sulfuric acid cross-link chitosan membranes were detected under various conditions with four-electrode AC impedance method. The typical impedance spectrum of cross-link chitosan membrane was obtained and shown in Fig.1. The results indicated that this method could avoid the influence of two-layer capacitance over a wide range of frequency from 10 to 104 Hz. None of the domestic papers has studied this method. The conductivities of chitosan cross-link membranes under various conditions were shown in table 1. The highest proton conductivity of 6 hours cross-link chitosan membrane was 0.047 S cm-1 at room temperature under fully hydrated conditions, and the introduction of sulfuric acid to the membrane can obviously enhance the proton conductivity. The proton conductivity activation energy of the membrane 18kJ/mol which corresponds to Grotthus mechanism, the mechanism of the proton conductivity in sulfuric acid cross-link chitosan membrane was proposed.更多还原