کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1288959 973279 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhanced capacitance and rate capability of graphene/polypyrrole composite as electrode material for supercapacitors
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Enhanced capacitance and rate capability of graphene/polypyrrole composite as electrode material for supercapacitors
چکیده انگلیسی

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.


► We prepare graphene and polypyrrole composite via a simple in situ polymerization method.
► Electrochemical properties of the composite are greater enhancement than pure samples with the maximum capacitance of 482 F g−1, excellent cycling performance and good rate capability.
► We study the effect of graphene on the properties of its composite with PPy for the different PPy/graphene ratios.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 196, Issue 14, 15 July 2011, Pages 5990–5996
نویسندگان
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