Enhanced capacitance and rate capability of graphene/polypyrrole composite as electrode material for
Enhanced capacitance and rate capability of graphene/polypyrrole composite as electrode material for
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DOI：
10.1016/j.jpowsour.2011.02.090
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
Dacheng Zhang;Xiong Zhang;Yao Chen;Yuanyuan Peng;Changhui Wang;Yanwei Ma
中科院分区：
文献类型：
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作者：
Dacheng Zhang;Xiong Zhang;Yao Chen;Yuanyuan Peng;Changhui Wang;Yanwei Ma
石墨烯和聚吡咯复合材料（PPy/GNS）是通过吡咯单体在石墨烯存在下在酸性条件下原位聚合合成的。通过X射线衍射(XRD)、拉曼光谱、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)和透射电子显微镜(TEM)对复合材料的结构和形貌进行了表征。研究发现，聚吡咯被石墨烯纳米片（GNS）均匀包围，形成均匀的复合材料。该复合材料比纯聚吡咯具有更高的比电容、更好的倍率性能和循环稳定性，是超级电容器的有前途的候选者。基于三电极电池配置的PPy/GNS复合材料的比电容在0.5Ag−1的电流密度下高达482Fg−1。 1000次循环后，比电容衰减小于5%，表明复合材料具有优异的循环性能。
Graphene and polypyrrole composite (PPy/GNS) is synthesized via in situ polymerization of pyrrole monomer in the presence of graphene under acid conditions. The structure and morphology of the composite are characterized by X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectrometer (FTIR), X-rays photoelectron spectroscopy (XPS) and transmission electron microscope (TEM). It is found that a uniform composite is formed with polypyrrole being homogeneously surrounded by graphene nanosheets (GNS). The composite is a promising candidate for supercapacitors to have higher specific capacitance, better rate capability and cycling stability than those of pure polypyrrole. The specific capacitance of PPy/GNS composite based on the three-electrode cell configuration is as high as 482Fg−1at a current density of 0.5Ag−1. After 1000 cycles, the attenuation of the specific capacitance is less than 5%, indicating that composite has excellent cycling performance.