Sulfonated poly(arylene ether sulfone) ionomers containing fluorenyl groups for fuel cell applications
Sulfonated poly(arylene ether sulfone) ionomers containing fluorenyl groups for fuel cell applications
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DOI：
10.1016/j.memsci.2007.10.037
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发表时间：
2008-03-05
影响因子：
9.5
通讯作者：
Watanabe, Masahiro
中科院分区：
文献类型：
--
作者：
Bae, Byungchan;Miyatake, Kenji;Watanabe, Masahiro
合成了一系列以荧基为主体的磺化聚芳醚砜S(SPE)，并对其进行了表征。3，3‘-二磺酸-4，4’-二氟苯基砜(SFP)单体的引入使离聚体在低湿度下具有较高的酸性和较高的质子电导率以及较高的质子扩散系数。在40%RH和80℃下，SPE_(60)膜的质子电导率达到4.6×10~(-3)S/cm，比我们以前的SPE膜的质子电导率(6×10~(-4)S/cm)提高了一个数量级。在低水体积分数下，SPE60膜的D_d约为SPE-1膜的4倍。SPE膜具有良好的氧化稳定性和水解性，以及良好的热性能和机械性能。小角X射线散射分析表明，SPE膜的相分离程度远低于全氟Nafion膜，这是其氢、氧渗透率较低的原因。(C)2007 Elsevier B.V.保留所有权利。
A series of sulfonated poly(arylene ether sulfone)s (SPEs) containing fluorenyl groups as bulky components were synthesized and characterized for fuel cell applications. Introduction of disodium 3,3'-disulfo-4,4'-difluorophenyl sulfone (SFPS) monomer gave ionomers with high acidity and accordingly high proton conductivity as well as high proton diffusion coefficient (D,) at low humidity. The membrane of SPE60 (where the number denotes mole percentage of the component containing sulfonic acid groups; IEC (ion exchange capacity) = 1.68 mequiv./g) exhibited high proton conductivity of 4.6 x 10(-3) S/cm at 40% RH and 80 degrees C, which is one order of magnitude higher than that (6 x 10(-4) S/cm) of our previous SPE (SPE-1, IEC = 1.58 mequiv./g). D, of SPE60 membrane was ca. 4 times higher than that of the SPE-1 membrane at low water volume fraction. SPE membranes showed good oxidative and hydrolytic stability as well as favorable thermal and mechanical properties. Small-angle X-ray scattering analyses showed that the phase separation of SPE membranes was much less developed than that of the perfluorinated Nafion membrane which accounts for lower hydrogen and oxygen permeability of the former membranes. (C) 2007 Elsevier B.V. All rights reserved.