膜科学与技术

m-PH-SiO2/Nafion复合膜的质子导电性

作者：邹智毅¹，魏小兰¹，付珍¹，李丽坤¹，丁静²

单位： 1. 华南理工大学化学与化工学院, 广州 510640；2. 中山大学工学院，广州 51027

关键词： m-PH-SiO2/Nafion；复合膜；质子导电性

出版年,卷(期):页码： 2011,31(5):25-28

摘要：

为提高Nafion膜在中温段的质子导电性，用溶胶-凝胶法制备比表面积为386m2•g-1掺磷中孔SiO2 (m-PH-SiO2)，并与Nafion的N, N二甲基甲酰胺溶液混合，重铸法制备不同m-PH-SiO2含量的m-PH-SiO2/Nafion复合膜。用N2－吸附脱附和TEM表征m-PH-SiO2的介孔结构，SEM观察复合膜的表面。以交流阻抗技术和隔膜扩散法考察m-PH-SiO2掺入量对复合膜的质子传导率和甲醇渗透性能的影响。结果显示，与相同条件制备的纯Nafion重铸膜相比，30~200℃范围内，两种复合膜的电导率都比Nafion重铸膜的有所提高，且m-PH-SiO2含量为7%时复合膜的质子电导达到最大。复合膜的甲醇渗透率随m-PH-SiO2含量增大也略有增加。

The mesoporous SiO2 with P2O5 hybrid in the pore walls (m-PH-SiO2) with higher surface 386m2•g-1 was synthesized by sol-gel method. The m-PH-SiO2/ Nafion composite membranes were prepared by recasting method with m-PH-SiO2 and Nafion dimethyl formamide solution. The proton conductivities of the membranes at 30oC ~200oC were measured by AC impedance technique. The results show that the conductivities of m-PH-SiO2/ Nafion membranes were higher than that of Nafion recasting membrane prepared under the same condition. The effect on proton conductivity and methanol permeability of filler content were studied, the result revealed that the optimal quantity of filled m-PH-SiO2 was 7%. However, the permeability of methanol increased appreciably with increasing of filled m-PH-SiO2.

智毅（1962-），男，江苏无锡人，硕士，讲师，从事电解质膜研究. *联系人< xlwei@scut.edu.cn>

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