石墨烯/聚吡咯纳米纤维超级电容器电极材料的制备及其电化学性能

超级电容器因其具有较高的循环稳定性和较好的能量密度而成为储能器件中的研究热点,其电极材料及制备方法是决定超级电容器电化学性能的关键因素。 本文以聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物(P123)为软模板,通过一步原位聚合法成功地制备了石墨烯/聚吡咯纳米纤维(GR/PPy NF)复合超级电容器电极材料。 通过X射线衍射(XRD),X射线光电子能谱(XPS)、透射电子显微镜(TEM)和傅里叶变换红外光谱仪(FT-IR)等对复合材料的结构和形态进行了系统的表征。 利用电化学方法对GR/PPy NF复合电极材料的电化学性能进行了系统的分析。 结果表明,在电流密度0.5 A/g下,纳米复合材料的比电容量高达969.5 F/g,在充放电600圈之后,仍可保留初始比电容的88%,展示了良好的电容性能及循环稳定性。 GR/PPy NF制备简单,性能优异,是一种很有前途的能量转换/存储材料。

Preparation and Electrochemical Performance of Praphene/Polypyrrole Nanofiber Composite as Supercapacitor Electrode Materials

Because of its high cyclic stability and good energy density, supercapacitor has become a research hotspot in energy storage devices. Electrode materials are the key factors to determine the electrochemical performance of supercapacitors. In this paper, Using poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer (P123) as a soft template, graphene/polypyrrole nanofiber (GR/PPy NF) composite supercapacitor electrode materials were successfully prepared by one-step in situ chemical oxidation polymerization. The structure and morphology of composite materials were systematically characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM) and Fourier transform infrared spectrometer (FT-IR). The electrochemical properties of GR/PPy NF composite electrode materials were systematically analyzed by electrochemical methods. The results reveal that at the current density of 0.5 A/g, the nanocomposite has a maximum capacitance of 969.5 F/g, and can retain 88% of the initial capacitance after 600 cycles of charge and discharge, showing good cyclic stability and excellent electrochemical performance for the electrode materials of supercapacitor. The facile preparation and excellent performance of the GR/PPy NF make it a promising material for energy conversion/storage application.