Porous Nafion nanofiber composite membrane with vertical pathways for efficient through-plane proton conduction
Porous Nafion nanofiber composite membrane with vertical pathways for efficient through-plane proton conduction
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多孔 Nafion 纳米纤维复合膜，具有垂直通道，可实现高效的平面质子传导
DOI：
10.1016/j.memsci.2019.05.041
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发表时间：
2019-09
影响因子：
9.5
通讯作者：
Liu Jindun
中科院分区：
文献类型：
--
作者：
Wang Jingtao;Li Ping;Zhang Yafang;Liu Yarong;Wu Wenjia;Liu Jindun
Nafion凭借优异的质子传导和理化性能，几十年来一直是质子交换膜的标杆。而传输通道连续性对湿度的强烈依赖性往往会导致电导率严重下降并阻碍其广泛应用。在此，提出了静电纺丝和软模板（离子液体）方法相结合来制造多孔Nafion纳米纤维。然后用壳聚糖（CS）浸渍所得纳米纤维垫以制备多孔纳米纤维复合膜（PNFCM）。这与传统的纳米纤维复合膜（NFCM）不同，传统的纳米纤维复合膜的面内电导率远低于面内电导率（即强传输各向异性）。多孔纳米纤维内部丰富的孔隙在CS和孔壁之间的界面处提供了许多垂直传输通道。同时，CS上的-NH/-NH2基团与孔壁上的-SO3H基团形成酸碱对。这些稳定的垂直路径显着促进了水合和无水条件下的平面质子传导。特别是，PNFCM在90°C和100% RH下的垂直电导率达到307mScm-1，在120°C和0% RH下的垂直电导率达到150mScm-1，分别是NFCM的3.2和2.7倍。因此，传递各向异性系数降低，燃料电池性能明显提高。
Nafion has been the benchmark of proton exchange membrane for decades due to the excellent proton conduction and physicochemical properties. While the strong dependence of transfer channel continuity on humidity always causes serious conductivity drops and hampers the wide application. Herein, a combination of electrospinning and soft template (ionic liquid) methods is proposed to fabricate porous Nafion nanofiber. The resultant nanofiber mat is then impregnated with chitosan (CS) to prepare porous nanofiber composite membrane (PNFCM). This is different from traditional nanofiber composite membrane (NFCM), of which through-plane conductivity is much lower than in-plane one (i.e., strong transfer anisotropy). The abundant pores inside porous nanofibers provide numerous vertical transfer channels at interfaces between CS and pore walls. Meanwhile, the –NH/–NH2groups on CS form acid-base pairs with –SO3H groups along pore walls. These stable vertical pathways significantly facilitate the through-plane proton conduction at both hydrated and anhydrous conditions. Particularly, PNFCM attains perpendicular conductivities of 307 mS cm−1at 90 °C and 100% RH, and 150 mS cm−1at 120 °C and 0% RH, which are, respectively, 3.2 and 2.7 times of that of NFCM. Consequently, the transfer anisotropy coefficient decreases and fuel cell performances enhance obviously.
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影响因子：
9.2
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
19
作者：
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通讯作者：
Jiang, Zhongyi