Preparation and electrochemical properties of functionalized graphene/ polyaniline composite electrode materials

Abstract

Octadecylamine functionalized graphene (ODA-G) was synthesized by the grafting of graphene oxide (GO) 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 ODAG 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∙g1 is obtained for 2%(w)ODA-G/PANI at a current density of 1.0 A∙g-1, compared with 426 F∙g-11 for PANI. Furthermore, ODA-G/PANI exhibits better stability than PANI.