Ionic liquid entrapment by an electrospun polymer nanofiber matrix as a high conductivity polymer electrolyte
Ionic liquid entrapment by an electrospun polymer nanofiber matrix as a high conductivity polymer electrolyte
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DOI：
10.1039/c5ra03935e
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发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Afifi, Amalina M.
中科院分区：
文献类型：
--
作者：
Datta, R. S.;Said, S. M.;Afifi, Amalina M.
通过外掺杂，利用离子液体成功制备了新型导电聚合物纳米纤维。本研究采用静电纺丝法制备了重量比为4:1的聚乙烯醇（PVA）和壳聚糖（CS）共混聚合物纳米纤维，并将其作为支架膜用于捕获室温离子液体（RTILs），如1-乙基-3-甲基咪唑氯（EMIMCl）和1-丁基-3-甲基咪唑溴（BMIMBr）。扫描电镜（SEM）形态学分析表明，电纺丝膜的支架结构有利于充分捕获RTILs。这种膜的电导率从6 × 10(-6) S cm（-1）显著提高到0.10 S cm(-1)，有趣的是超过了纯离子液体的电导率，聚合物链呼吸模型被认为是解释这一现象的假设。用离子转移数的测量解释了离子作为载流子的优势。利用傅里叶变换红外光谱（FTIR）解释了聚合物纳米纤维基体与离子液体之间的相互作用，发现离子液体在聚合物纳米纤维基体中物理分散。这些材料还显示出一些热电（TE）活性，通过证明塞贝克系数高达17.92 mu V K-1。这种类型薄膜中自由移动离子的存在显示了它们作为能量存储/转换设备的应用，如有机热电（TEs）、传感器和染料敏化太阳能电池。
Through external doping, novel conductive polymer nanofibers were successfully fabricated using ionic liquids. In this study, a polymer blend of polyvinyl alcohol (PVA) and chitosan (CS) in a 4 : 1 weight ratio was fabricated in the form of nanofibers through electrospinning and used as a scaffold membrane to capture room-temperature ionic liquids (RTILs), such as 1-ethyl-3-methylimidazolium chloride (EMIMCl) and 1-butyl-3-methylimidazolium bromide (BMIMBr). Morphological analysis using scanning electron microscopy (SEM) showed that the scaffold structure of the electrospun membrane facilitated sufficient trapping of RTILs. This membrane demonstrated significantly increased conductivity from 6 x 10(-6) S cm(-1) to 0.10 S cm(-1), interestingly surpassing the value of pure ionic liquids, where the polymer chain breathing model has been suggested as a hypothesis to explain this phenomena. The dominance of ions as charge carriers was explained using an ionic transference number measurement. The interaction between the polymer nanofiber matrix and an ionic liquid has been explained using Fourier-transform infrared spectroscopy (FTIR), where the ionic liquid was found to be physically dispersed in the polymer nanofiber matrix. These materials have also shown some thermoelectric (TE) activity, by demonstrating Seebeck coefficients up to 17.92 mu V K-1. The existence of freely movable ions in this type of membrane shows their applications as energy storage/conversion devices such as organic thermoelectrics (TEs), sensors, and dye-sensitised solar cells.