期刊
JOURNAL OF POWER SOURCES
卷 196, 期 14, 页码 5990-5996出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2011.02.090
关键词
Graphene nanosheet; Polypyrrole; Composite; Electrode material; Supercapacitors
资金
- Chinese Academy of Sciences [KJCX2-YW-W26]
- National Natural Science Foundation of China [21001103, 51025726]
- Director Foundation of Institute of Electrical Engineering
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 482 F g(-1) at a current density of 0.5 A g(-1). After 1000 cycles, the attenuation of the specific capacitance is less than 5%, indicating that composite has excellent cycling performance. (C) 2011 Elsevier B.V. All rights reserved.
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