Synthesis and characterization of hybrid poly (N, N-dimethylacrylamide) composite hydrogel electrolytes and their performance in supercapacitor
Synthesis and characterization of hybrid poly (N, N-dimethylacrylamide) composite hydrogel electrolytes and their performance in supercapacitor
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DOI：
10.1016/j.electacta.2019.135438
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发表时间：
2020-02-01
影响因子：
6.6
通讯作者：
Ramesh, K.
中科院分区：
文献类型：
--
作者：
Bashir, Shahid;Omar, Fatin Saiha;Ramesh, K.
水凝胶材料由于其有趣的结构而受到越来越多的研究兴趣，这些结构由聚合物链的交联网络组成，间隙充满了溶剂水。这一特性赋予了材料湿润和柔软的特性，使其成为柔性储能装置（如目前正在深入研究的超级电容器）的电解质材料的理想候选者。本研究通过自由基机制制备了杂化聚（N， N-二甲基丙烯酰胺）（PDMA）水凝胶。以过硫酸铵为自由基引发剂，蒙脱土钠为交联剂。三氟甲烷磺酸镁（MgTf2）和氧化钴（Co3O4）纳米颗粒的加入提供了传导途径。采用傅里叶变换红外光谱（FTIR）、x射线衍射分析（XRD）、热重分析（TGA）和场发射扫描电镜（FESEM）对合成的水凝胶进行了表征。利用能量色散x射线光谱（EDX）证实了混合水凝胶中存在Co3O4纳米颗粒。采用电化学阻抗谱（EIS）对离子电导率进行了研究。离子电导率研究表明，含有MgTf2和Co3O4纳米粒子（DMA3）的水凝胶具有最高的环境离子电导率(分别为9.4 x 10（-3) S cm(-1)）、介电常数和最低的活化能（0.094 eV）。测定了水凝胶电解质的迁移数，描述了由于盐离子和纳米粒子的存在而引起的离子运动。此外，采用活性炭电极对合成的水凝胶在双电层电容器（EDLC）中的电化学性能进行了测试。循环伏安（CV）和充放电（GCD）等电化学研究表明，含MgTf2和Co3O4纳米粒子（DMA3）的水凝胶在3 mV s（-1）和30 mA g（-1）下的最大比电容分别为26.1 F g（-1）和29.48 F g（-1）。此外，在200 mA g（-1）的电流密度下，它能够承受超过8000次循环的97.4%的初始电容值。该装置实现了发光二极管（LED）的成功点亮。因此，可以说合成的水凝胶电解质在智能、轻量化和柔性电子器件方面具有重要的潜力。(C) 2019 Elsevier Ltd.版权所有。
Hydrogel materials are receiving increasing research interest due to their intriguing structures that consist of a crosslinked network of polymer chains with interstitial spaces filled with solvent water. This feature endows the materials with the characteristics of being both wet and soft, making them ideal candidates for electrolyte materials for flexible energy storage devices, such as supercapacitors that are under intensive studies nowadays. In this study, hybrid poly (N, N-dimethylacrylamide) (PDMA) hydrogels were prepared through free radical mechanism. Ammonium persulfate was used as a free radical initiator while sodium montmorillonite was used as a crosslinker. Magnesium trifluoromethanesulfonate (MgTf2) and cobalt oxide (Co3O4) nanoparticles were added to provide the conduction pathway. The synthesized hydrogels were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), and field emission scanning electron microscopy (FESEM). The presence of Co3O4 nanoparticles in the hybrid hydrogel was confirmed using energy dispersive X-ray spectroscopy (EDX). The ionic conductivity study was performed using electrochemical impedance spectroscopy (EIS). The ionic conductivity study revealed that hydrogel containing MgTf2 and Co3O4 nanoparticles (DMA3) has the highest ambient ionic conductivity (9.4 x 10(-3) S cm(-1), respectively), dielectric permittivity, and lowest activation energy (0.094 eV). Transference number of hydrogel electrolyte was measured which described the movement of ions due to the presence of salt ions and nanoparticles. Furthermore, electrochemical performance of the synthesized hydrogels in electric double layer capacitor (EDLC) was examined using activated carbon electrode. The electrochemical studies such as cyclic voltammetry (CV) and galvanic charge-discharge (GCD) revealed that hydrogel containing MgTf2 and Co3O4 nanoparticles (DMA3) hydrogel showed maximum specific capacitance of 26.1 F g(-1) at 3 mV s(-1) and 29.48 F g(-1) at 30 mA g(-1), respectively. Additionally, it was able to withstand 97.4% of capacitance from its initial capacitance value over 8000 cycles at a current density of 200 mA g(-1). The fabricated device revealed the successful light up of light emitting diode (LED). Hence, it can be said that the synthesized hydrogel electrolyte has significant potential for smart, light weight, and flexible electronic devices. (C) 2019 Elsevier Ltd. All rights reserved.