Citation: WANG Li-Li, XING Rui-Guang, ZHANG Bang-Wen, HOU Yuan. Preparation and Electrochemical Properties of Functionalized Graphene/Polyaniline Composite Electrode Materials[J]. Acta Physico-Chimica Sinica, ;2014, 30(9): 1659-1666. doi: 10.3866/PKU.WHXB201406162
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Octadecylamine functionalized graphene (ODA-G) was synthesized by the grafting of graphene oxide ( ) with ODA followed by reduction with hydrazine hydrate. Subsequently, ODA-G/polyaniline (PANI) composites were prepared using a facile solvent-blending procedure. ODA-G and ODA-G/PANI composites were characterized by Fourier transform infrared spectrometry (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Raman spectroscopy, and transmission electron microscopy (TEM). The electrochemical properties of the composites were measured based on cyclic voltammetry (CV), galvanostatic charge/discharge, and ac impedance spectroscopy. The results show that ODA-G as a support material provides additional electron transfer paths, as well as active sites, for the electrochemical redox reaction of PANI, which helps to increase its pseudocapacitance. A specific capacitance of 782 F·g-1 is obtained for 2%(w)ODA-G/PANI at a current density of 1.0 A·g-1, compared with 426 F·g-1 for PANI. Furthermore, ODA-G/PANI exhibits better stability than PANI.
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