Self-assembled hierarchical graphene/polyaniline hybrid aerogels for electrochemical capacitive energy storage
Self-assembled hierarchical graphene/polyaniline hybrid aerogels for electrochemical capacitive energy storage
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用于电化学电容储能的自组装分层石墨烯/聚苯胺混合气凝胶
DOI：
10.1016/j.electacta.2014.06.017
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发表时间：
2014-08
影响因子：
6.6
通讯作者：
Hui Chai
中科院分区：
文献类型：
--
作者：
Maowen Xu;Shu-Juan Bao;Hua Wei;Hui Chai
在这项工作中，聚苯胺纳米线(PANI-NWS)作为间隔体，与氧化石墨烯结合，通过简单的水热途径自组装成石墨烯/PANI杂化气凝胶。用X射线衍射仪(XRD)、傅立叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)、接触角测量、场发射扫描电子显微镜(FESEM)和透射电子显微镜(TEM)对样品的微观结构、形貌和对水的相对亲和力进行了表征。采用循环伏安法(CV)和交流阻抗谱(EIS)研究了样品的组成、微观结构和形貌对其电容性能的影响。实验结果表明，PANI能有效地调整产物的微观结构和电化学性能。制备的材料中含有适当比例的PANI纳米线，可以有效地防止相邻的石墨烯片层的聚集，并为电化学储能提供快速的离子通道。石墨烯/聚苯胺杂化气凝胶的比电容达到了520.3 F g−1，同时也表现出了优异的循环稳定性。
In this work, polyaniline nanowires (PANI-NWs) act as spacers, incorporated with graphene oxide and self-assembled into graphene/PANI hybrid aerogels through a facile hydrothermal route. The as-synthesized samples have been characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectra, X-ray photoelectron spectroscopy (XPS), contact angle measurement, field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) for their microstructure, morphology and relative affinities toward water. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements have been used to study the effects of composition, microstructure and morphology of the samples on their capacitive performance. The experimental results indicate that the PANI can effectively tailor the microstructures and electrochemical performances of the products. The as-prepared materials with an appropriate proportion of PANI nanowires can efficiently prevent the adjacent graphene sheets from aggregation and provide fast ionic channels for electrochemical energy storage. A specific capacitance of 520.3 F g−1has been achieved from graphene/PANI hybrid aerogel, which also exhibits excellent cycling stability.
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