Polypyrrole nanocomposites doped with functional ionic liquids for high performance supercapacitors
Polypyrrole nanocomposites doped with functional ionic liquids for high performance supercapacitors
复制标题
掺杂功能性离子液体的聚吡咯纳米复合材料用于高性能超级电容器
DOI：
10.1039/c7nj04367h
复制
发表时间：
2018-03-07
影响因子：
3.3
通讯作者：
Xiong, Yubing
中科院分区：
文献类型：
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作者：
Cao, Peng;Fan, Yuxia;Xiong, Yubing
本研究制备了由羧基或磺酸基组成的功能性离子液体作为聚吡咯（PPy）纳米复合材料的掺杂剂。以FeCl 3·6 H2O为氧化剂，通过化学氧化聚合吡咯（Py），可以方便地制备出这种新型的纳米复合材料。采用傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、能谱仪（EDS）、X射线光电子能谱仪（XPS）和氮气吸附/脱附等温线等测试手段对IL@PPy纳米复合材料进行了表征。扫描电镜（SEM）结果表明，当PPy掺杂1-乙烯基-3-羧甲基咪唑氯（[VCMIm]Cl）时，可以得到片状纳米结构。通过循环伏安法（CV）、恒流充放电（GCD）和电化学阻抗谱（EIS）等测试手段研究了IL@PPy电极材料的电化学性能。结果表明，IL@PPy纳米复合材料的电化学性能受其组成的显著影响。特别是当[VCMIm]Cl与Py的投料比为3：1（mol mol-1）时，可以获得非常高的比电容（在0.5 A g-1的电流密度下为520 F g-1）。 其良好的电化学性能可能是由于片状纳米结构。循环性能测量表明，在1.0 M KCl水溶液中循环800次后，可保持82%的电容。因此，预计我们的策略为制造用于高性能超级电容器的PPy纳米复合材料开辟了新途径。
In this study, functional ionic liquids (ILs) composed of carboxyl or sulfonic groups were fabricated as dopants for polypyrrole (PPy) nanocomposites. These novel nanocomposites could be conveniently prepared via chemical oxidation polymerization of pyrrole (Py) using FeCl3·6H2O as the oxidant. The as-prepared IL@PPy nanocomposites were examined using Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption/desorption isotherm measurements. SEM images revealed that the schistose nanostructure could be obtained when PPy was doped with 1-vinyl-3-carboxymethylimidazole chloride ([VCMIm]Cl). Electrochemical performances of electrode materials based on IL@PPy were investigated via cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) measurements. The results demonstrated that the electrochemical properties of IL@PPy nanocomposites were significantly influenced by their composition. Especially, a comparably high specific capacitance (520 F g−1 at the current density of 0.5 A g−1) could be achieved when [VCMIm]Cl@PPy nanocomposites were prepared with the feed ratio of [VCMIm]Cl to Py of 3 : 1 (mol mol−1). Their good electrochemical performance probably resulted from the schistose nanostructure. Cycling performance measurements indicated that 82% capacitance could be retained after 800 cycles in 1.0 M KCl aqueous solution. Therefore, it is anticipated that our strategy opens up a new avenue for fabricating PPy nanocomposites for high performance supercapacitors.