Synthesis and characterization of sulfonated poly (arylene ether sulfone)/silicotungstic acid composite membranes for fuel cells
Synthesis and characterization of sulfonated poly (arylene ether sulfone)/silicotungstic acid composite membranes for fuel cells
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燃料电池用磺化聚芳醚砜/硅钨酸复合膜的合成与表征
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发表时间：
2013
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通讯作者：
S. Jaisankar
中科院分区：
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作者：
Paradesi Deivanayagam;A. Ramamoorthy;S. Jaisankar
以磺化聚芳醚砜（SPAES）为基体，制备了一系列嵌有硅钨酸（STA）的复合膜。采用芳香族直接亲核聚合法合成了SPAES，然后与STA进行溶液共混。傅里叶变换红外光谱分析表明，聚合物主链上的磺酸基团与STA中的三氧化钨发生了相互作用。复合膜在60 °C下用水处理24 h后表现出低的杂多酸萃取。复合膜的特征在于水的吸收，离子交换容量（IEC），水解稳定性，质子传导性和热稳定性，以评估这些膜的燃料电池的适用性。膜的质子传导率随着STA含量的增加而增加。随着STA含量的增加，复合膜在30 °C下的电导率从0.079 S cm-1增加到0.109 S cm-1，而母体膜的质子电导率为0.073 S cm-1。该复合膜不仅具有良好的质子传导性，而且具有优异的热稳定性和机械强度。该研究表明，基于SPAES和STA的复合膜可以作为电解质膜的可行候选者。研究了分散硅钨酸（STA）对膜性能的影响。复合膜的质子传导率高于SPAES膜。尽管复合膜的IEC和吸水率随着STA含量的增加而降低，但质子传导率和水解稳定性增加。磺酸基的酸性随着STA的引入而增加。由于复合膜显示出可忽略的STA提取，因此大部分STA保留在聚合物中，这增加了膜的效率。
A series of composite membranes based on sulfonated poly (arylene ether sulfone) (SPAES) embedded with powdered silicotungstic acid (STA) was synthesized. SPAES was synthesized by direct aromatic nucleophilic polymerization and then solution blended with STA. Fourier-transform infrared spectroscopy analysis showed that the sulfonic acid groups on the polymer backbone interacted with the tungstic oxide in STA. The composite membranes exhibited a low Heteropolyacid extraction after treatment with water at 60 °C for 24 h. The composite membranes were characterized for water uptake, ion-exchange capacity (IEC), hydrolytic stability, proton conductivity and thermal stability in order to evaluate the suitability of these membranes for fuel cells. The proton conductivity of the membranes increased with increasing STA content. With an increase in the STA content, the conductivity of the composite membranes at 30 °C increased from 0.079 to 0.109 S cm−1, whereas the parent membrane exhibits a proton conductivity of 0.073 S cm−1. The composite membranes not only had good proton conductivity but also showed excellent thermal stability and mechanical strength. This study shows that the composite membranes based on SPAES and STA can be viable candidates for electrolyte membranes. The influence of the dispersed silicotungstic acid (STA) on the membrane properties was studied. The proton conductivities of the composite membranes are higher than the parent SPAES membrane. Even though IEC and water uptake of the composite membranes decreased with increase in STA content, the proton conductivities and hydrolytic stabilities were increased. The acidity of the sulfonic acid group increased with the incorporation of STA. As the composite membranes showed negligible STA extraction, most of the STA retained in the polymer and this increases the efficiency of the membrane.