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Facile fabrication of polyaniline films with hierarchical porous networks for enhanced electrochemical activity
Journal of Industrial and Engineering Chemistry ( IF 6.1 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.jiec.2020.02.013
Ji-Hye Kim , Ju-Hee So , Sung-Kon Kim , Hyunsik Yoon , Jonghoon Choi , Hyung-Jun Koo

Abstract This paper describes a facile method for fabricating polyaniline (PANI) films with well-defined three-dimensional (3D) porous networks and improved electrochemical activity. The PANI hydrogel pastes with different compositions are directly cast into thin films by the doctor blade technique. After a dehydration step, the conductivity of the PANI drastically increases, while the porous structure with hierarchical macro- and meso-porosity is formed in the PANI film. The electrical conductivity tends to increase with the thickness of the porous PANI film until it fails to form a mechanically stable film not exhibiting cracking problems. We found that the amount of the initiator, the aniline monomer, and the crosslinker significantly affect not only the micro-morphology of PANI films, but also their electrical and electrochemical characteristics. Importantly, when the amounts of the crosslinker and the initiator increase, the polymer film forms with a dense internal morphology with smaller pores. Based on the engineered synthesis composition, we demonstrate a supercapacitor with porous PANI electrodes. Due to the hierarchical porous structure, large surface area and the improved conductivity, the resulting devices show excellent volumetric capacitances, which are comparable to or much higher than those previously reported.

中文翻译:

易于制造具有分级多孔网络的聚苯胺薄膜以增强电化学活性

摘要 本文描述了一种制备具有明确定义的三维 (3D) 多孔网络和改进的电化学活性的聚苯胺 (PANI) 薄膜的简便方法。通过刮刀技术将不同成分的PANI水凝胶糊直接浇铸成薄膜。经过脱水步骤后,PANI 的电导率急剧增加,同时在 PANI 膜中形成具有大孔和中孔分级的多孔结构。导电率往往随着多孔 PANI 膜的厚度而增加,直到它不能形成机械稳定的膜,不会出现开裂问题。我们发现引发剂、苯胺单体和交联剂的用量不仅显着影响 PANI 薄膜的微观形貌,以及它们的电气和电化学特性。重要的是,当交联剂和引发剂的量增加时,聚合物膜形成具有致密内部形态和较小孔。基于工程合成组合物,我们展示了具有多孔 PANI 电极的超级电容器。由于分层多孔结构、大表面积和改进的电导率,所得器件显示出优异的体积电容,与之前报道的相当或远高于这些。
更新日期:2020-06-01
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