Abstract
Novelcarbonmaterials containing heteroatoms (nitrogen and oxygen) were prepared by carbonizing H2SO4-doped polyaniline at different temperatures. The morphology, elemental composition, surface chemical composition, and surface area of the as-prepared samples were investigated by scanning electron microscopy (SEM), elemental analyzer, X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) measurements. Electrochemical properties were studied by cyclic voltammetry (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS). The results show that the carbon prepared by carbonizing polyaniline at 800 ℃ has good electrochemical performance and its specific capacitance value is as high as 153 F•g^(-1) under a current density of 0.5 A•g^(-1), although it has a low specific surface area (325 m^2•g^(-1)).The high specific capacitance of this carbon is believed to be due to its proper proportion of heteroatoms (nitrogen and oxygen), which provide a large amount of pseudo-capacitance. This kind of carbon material can thus be used as a promising electrode material in supercapacitors.
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