Thermoelectric Potential of Polymer-Scaffolded Ionic Liquid Membranes
Thermoelectric Potential of Polymer-Scaffolded Ionic Liquid Membranes
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DOI：
10.1007/s11664-013-2799-1
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发表时间：
2014-06-01
影响因子：
2.1
通讯作者：
Miyazaki, Y.
中科院分区：
文献类型：
--
作者：
Datta, R. S.;Said, S. M.;Miyazaki, Y.
有机薄膜由于其易于制造、柔性、成本效益和低热导率而被视为潜在的热电（TE）材料。然而，它们固有的低电导率是导致基于聚合物的TE材料的TE品质因数比无机材料相对较低的主要缺点。本文介绍了一种通过引入离子液体来增强聚合物离子传输性能的技术。该聚合物是使用静电纺丝技术生产的可降解支架的形式。然后将这些纤维浸泡在基于取代的咪唑鎓的不同离子液体中，例如氯化1-乙基-3-甲基咪唑鎓或溴化1-丁基-3-甲基咪唑鎓。该方法适用于静电纺丝聚丙烯腈和聚乙烯醇和壳聚糖聚合物的混合物。已经观察到膜的离子传输特性随着离子液体浓度的增加而增加，在室温下测量的最大电导率为1.20 × 10（-1）S/cm。有趣的是，最大电导率值超过了纯离子液体的值。这些结果表明，可以通过简单且具有成本效益的方法显著提高聚合物膜的导电性。这又可以提高聚合物材料的TE品质因数，众所周知，聚合物材料的TE品质因数显著低于无机材料。在本文中还提出了在膜的塞贝克系数的结果，以提供聚合物支架的离子液体膜的TE电位的总体表示。
Organic thin films have been viewed as potential thermoelectric (TE) materials, given their ease of fabrication, flexibility, cost effectiveness, and low thermal conductivity. However, their intrinsically low electrical conductivity is a main drawback which results in a relatively lower TE figure of merit for polymer-based TE materials than for inorganic materials. In this paper, a technique to enhance the ion transport properties of polymers through the introduction of ionic liquids is presented. The polymer is in the form of a nanofiber scaffold produced using the electrospinning technique. These fibers were then soaked in different ionic liquids based on substituted imidazolium such as 1-ethyl-3-methylimidazolium chloride or 1-butyl-3-methylimidazolium bromide. This method was applied to electrospun polyacrylonitrile and a mixture of polyvinyl alcohol and chitosan polymers. The ion transport properties of the membranes have been observed to increase with increasing concentration of ionic liquid, with maximum electrical conductivity of 1.20 x 10(-1) S/cm measured at room temperature. Interestingly, the maximum electrical conductivity value surpassed the value of pure ionic liquids. These results indicate that it is possible to significantly improve the electrical conductivity of a polymer membrane through a simple and cost-effective method. This may in turn boost the TE figures of merit of polymer materials, which are well known to be considerably lower than those of inorganic materials. Results in terms of the Seebeck coefficient of the membranes are also presented in this paper to provide an overall representation of the TE potential of the polymer-scaffolded ionic liquid membranes.