Coal tar residues-based nanostructured activated carbon/Fe3O4 composite electrode materials for supercapacitors
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Oxygen-rich activated carbon with a three-dimensional network structure was prepared by chemical activation of coal tar residues with potassium hydroxide and subsequent carbonization treatment. Nanostructured Fe3O4/AC composites were then prepared by simple chemical coprecipitation method and were used as active electrode materials for supercapacitors. The electrochemical behaviors of Fe3O4/AC nanocomposites were characterized by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy in 1.0 M Na2SO3 electrolyte. It was shown that the specific capacitance of Fe3O4/AC nanocomposites reached 150 F g−1 at a current density of 3.0 A g−1 and was a great improvement over Fe3O4 or AC alone. Furthermore, as-prepared Fe3O4/AC nanocomposites exhibited long cycle life without obvious capacitance fading even after 1,000 charge/discharge cycles. Compared with pure Fe3O4 and AC, the significant enhanced electrochemical performance of Fe3O4/AC nanocomposites could be reasonably attributed to the positive synergetic effect between Fe3O4 and AC.
KeywordsCoal tar residues Chemical activation Activated carbon Ferroferric oxide Supercapacitor
This work was supported by the Open Project of Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education (11zxgk11) and the Foundation from the Technology R&D Program of Sichuan Province (No. 2010GZ0300). We are also grateful for the help of Analytical and Testing Center of Southwest University of Science and Technology.
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