Compatible ionic crosslinking composite membranes based on SPEEK and PBI for high temperature proton exchange membranes
Compatible ionic crosslinking composite membranes based on SPEEK and PBI for high temperature proton exchange membranes
复制标题
基于SPEEK和PBI的高温质子交换膜相容离子交联复合膜
DOI：
10.1016/j.ijhydene.2016.05.227
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发表时间：
2016-07-27
影响因子：
7.2
通讯作者：
Wang, Yuxin
中科院分区：
文献类型：
--
作者：
Song, Mingfeng;Lu, Xuewei;Wang, Yuxin
制备了高磺化度聚醚醚酮（SPEEK）/聚苯并咪唑（PBI）复合高温质子交换膜。为了提高SPEEK与PBI的相容性，将SPEEK转化为SPEEK-Na，并将制备的SPEEK-Na/PBI在稀酸中浸泡，得到所需的离子交联SPEEK/PBI膜。扫描电镜结果表明PBI形成了致密的结构。复合膜横截面的能量色散X射线光谱和X射线衍射表明，PBI在SPEEK中均匀分布，没有相分离。傅里叶变换红外光谱表明-SO 3 H与N-碱性基团之间存在较强的离子键。SPEEK/PBI复合膜由于相互作用强烈，不仅能显著提高膜的机械强度和抗氧化性，而且能降低膜的溶胀度和甲醇渗透。热重分析结果表明，该膜可以在低于200 ℃下使用。SPEEK/PBI（20wt%）复合膜在170 ℃和100%相对湿度（RH）下的质子电导率可达0.1985 S cm（-1）。质子转移活化能为49.31 kJ mol（-1）。在50%RH下，电导率在180 ℃下为0.099 S cm（-1），并且在干燥烘箱中在180 ℃下保持0.0084 S cm（-1）的值。SPEEK/PBI（20重量%）膜的甲醇渗透率在70 ℃下为3.96 × 10（-8）cm（2）s（-1）。该复合膜在直接甲醇燃料电池中具有潜在的应用价值。(C)2016氢能出版物有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
Highly sulfonated poly (ether ether ketone) (SPEEK)/polybenzimidazole (PBI) composite high temperature proton exchange membranes were prepared. To enhance the compatibility of SPEEK and PBI, SPEEK was transformed into SPEEK-Na and the prepared SPEEK-Na/PBI was immersed in dilute acid to obtain desired ionic crosslinking SPEEK/PBI membrane. Scanning electron microscope results showed that PBI formed a dense structure. Energy dispersive X-ray spectroscopy of the cross-section of composite membranes and X-ray diffraction declared that PBI were uniformly distributed in SPEEK without phase separation. Fourier-transform infrared spectroscopy indicated the intense ionic bonds between -SO3H and N-basic group. Because of the intense interaction, SPEEK/PBI composite membranes could not only significantly improve the mechanical strength and oxidation resistance, but also reduce the swelling degree and methanol crossover. Thermogravimetric analysis results revealed that the membranes could be used below 200 degrees C. The proton conductivity of the SPEEK/PBI (20 wt%) composite membranes could reach 0.1985 S cm(-1) at 170 degrees C and 100% relative humidity (RH). Proton transfer activation energy was 49.31 kJ mol(-1). At 50% RH, the conductivity was 0.099 S cm(-1) at 180 degrees C and it remained the value of 0.0084 S cm(-1) at 180 degrees C in dry oven. The methanol permeability of SPEEK/PBI (20 wt%) membrane was 3.96 x 10(-8) cm(2) s(-1) at 70 degrees C. The composite membrane appeared to be potential for usage in direct methanol fuel cells. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.