Proton conductive properties of composite membranes containing uniaxially aligned ultrafine electrospun polyimide nanofiber
Proton conductive properties of composite membranes containing uniaxially aligned ultrafine electrospun polyimide nanofiber
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DOI：
10.1016/j.jpowsour.2012.05.118
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发表时间：
2012-11
影响因子：
9.2
通讯作者：
T. Tamura;Ryo Takemori;H. Kawakami
中科院分区：
文献类型：
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作者：
T. Tamura;Ryo Takemori;H. Kawakami
由含氟五元环磺化聚酰亚胺制备的纳米纤维具有超细、均匀的非珠状结构，在优化的静电纺丝条件下可制备出直径在80 ~ 160 nm范围内的磺化聚酰亚胺纳米纤维。制备了一种用于质子交换膜燃料电池的新型磺化聚酰亚胺膜，该膜含有单轴取向的磺化聚酰亚胺超细纳米纤维。复合膜在平行于纳米纤维排列方向上的质子传导率随着纳米纤维直径的减小和复合膜中纳米纤维量的增加而增加，并且在90 °C和98%RH下达到0.3S cm-1。此外，平行的质子传导率表明显着更高的值相比，在垂直方向上的复合膜或膜没有纳米纤维制备的常规溶液浇铸方法。复合膜也表现出更高的化学稳定性比那些没有纳米纤维的膜。因此，纳米纤维被证明是一种有前途的质子交换材料，含有纳米纤维的复合膜可能在燃料电池中有潜在的应用。
The nanofiber electrospun from the five-membered ring sulfonated polyimide containing the fluorinated group showed an ultrafine and uniform non-beaded structure and the optimized electrospinning conditions produced the sulfonated polyimide nanofibers with several appropriate diameters ranging from 80 to 160 nm. Novel sulfonated copolyimide membranes containing uniaxially aligned ultrafine sulfonated copolyimide nanofibers were prepared for proton exchange membrane fuel cell applications. The proton conductivity of the composite membrane in the parallel direction to the nanofibers alignment increased with the decreasing nanofiber diameter and the increasing amount of nanofibers in the composite membrane and reached 0.3 S cm−1at 90 °C and 98% RH. In addition, the parallel proton conductivity indicated significantly higher values when compared to that determined for the composite membrane in the perpendicular direction or for the membrane without nanofibers prepared by a conventional solution-casting method. The composite membranes also showed higher chemical stabilities than those of the membrane without nanofibers. Consequently, nanofibers proved to be promising proton exchange materials and the composite membranes containing nanofibers may have potential application for use in fuel cells.