Proton conduction in Nafion composite membranes filled with mesoporous silica
Proton conduction in Nafion composite membranes filled with mesoporous silica
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DOI：
10.1016/j.jpowsour.2007.06.007
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发表时间：
2007-09-27
影响因子：
9.2
通讯作者：
Sumita, Masao
中科院分区：
文献类型：
--
作者：
Tominaga, Yoichi;Hong, In-Chul;Sumita, Masao
质子传导聚合物膜的研究是未来高性能聚合物电解质膜燃料电池（PEM-FC）发展的关键。特别地，用于抑制聚合物基质中的水在高温下的挥发性的方法是一个关键问题，直接关系到PEM-FC系统的操作。在这项研究中，我们专注于聚合物复合膜，其中包括商业Nation和介孔二氧化硅（MPSi）作为新型无机添加剂，并调查在高温下的总质子电导率和良好的电化学稳定性的改善。多孔硅（MPSi）具有极大的比表面积、完美的表面状态和规则的孔结构，具有广泛的应用前景。我们发现，用MPSi填充的Nation复合材料具有比纯Nation高约1.5倍的质子传导率（在80 ° C和95%RH下大于0.1 S cm（-1）），并且相对于纯Nafion和颗粒SiO2复合材料可以显示出良好的温度性能。此外，在40 ℃和95%RH下，Nafion/磺化MPSi的电导率最高（0.094 S cm（-1））。这可能是由于MPSi的大表面积，这可以增加Nafion基质中的水吸附。(C)2007 Elsevier B. V.保留所有权利。
Studies of proton-conductive polymer membranes are vital for the future development of high-performance polymer electrolyte membrane fuel cells (PEM-FC). In particular, a method for inhibiting the volatility of water in the polymer matrix at high temperatures is a crucial issue, directly related to the operation of PEM-FC system. In this study, we focus on polymer composite membranes, which consist of commercial Nation and mesoporous silica (MPSi) as novel inorganic additives, and investigate an improvement in the total proton conductivities and the good electrochemical stability at high temperatures. MPSi, which can be synthesized with pore sizes from 1 to 10 nm, has a wide range of potential applications because of its extraordinary properties, such as extremely large surface area, flawless surface condition and well-regulated porous structure. We found that the Nation composites filled with MPSi have approximately 1.5 times higher proton conductivities (more than 0.1 S cm(-1) at 80 degrees C and 95%RH) than pure Nation and can display good temperature performance relative to pure Nafion and the particle SiO2 composite. Moreover, the conductivity of Nafion/sulfonated MPSi was the highest (0.094 S cm(-1)) at 40 degrees C and 95%RH. These are probably due to the large surface area of MPSi, which can increase the water adsorption in Nafion matrix. (C) 2007 Elsevier B.V. All rights reserved.