摘要：Activated carbon (AC) from pepper straw was used as a carbon source to prepare a semi- graphitized carbon electrode material (GCM) via catalytic graphitization with a nickel catalyst. The influence of the Ni/AC and graphitization temperature on the properties (phase composition and microstructure) of the GCM was investigated. The morphology and surface properties of the samples were characterized by means of a specific surface area and aperture analyzer, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction, and Raman spectroscopy. The cyclic voltammetry characteristics of the samples were examined using an electrochemical workstation. The results showed that the GCM was successfully prepared via the catalytic graphitization method, and it had a large surface area (743.429 m~2/g), when the quantity of Ni/AC was 0.2 mol%, the heat treatment temperature was 700 °C, and the soaking time was 1 h. The specific capacitance of the GCM was 262.595 F/g, and a number of microporous and mesoporous structures existed in the material. The GCM had a three-dimensional structure (d_(002)〜0.340 nm, L_c〜11.523 nm). The d_(002) was close to that of ideal graphite, indicating the formation of a well-graphitized structure. The degree of graphitization was 0.46, and the value of ID/IG was 0.65. The results are significant for improving the electrochemical performance of activated carbon electrodes. A new approach was also established for the treatment and disposal of pepper straw.
