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张洪涛课题组 | SCIENCE CHINA-TECHNOLOGICAL SCIENCES

发布人:    发布时间:2022/12/18   浏览次数:

Preparation of graphene-based active carbons from petroleum asphalt for high-performance supercapacitors without added conducting materials

作者:

Wang, B (Wang, Bin) [1] , [5] ; Xie, PY (Xie, PengYi) [1] ; Zhang, M (Zhang, Miao) [2] ; Zhang, HT (Zhang, HongTao) [3] , [4] ; Chen, YS (Chen, YongSheng) [3] , [4]
SCIENCE CHINA-TECHNOLOGICAL SCIENCES, 2022, 65( 12):  2866-2873

特刊

SI

DOI

10.1007/s11431-022-2207-x

摘要

Graphene-based active carbons (G-ACs) with a high specific surface area and high conductivity are promising electrode materials for high-performance supercapacitors. Typically, however, syntheses of the G-ACs call for expensive raw materials and are cumbersome. Here, the G-ACs are obtained by direct chemical activation of petroleum asphalt. The highest specific surface area of the prepared G-ACs is 3505 m(2)/g and the corresponding conductivity is 32 S/m. Electrodes fabricated using the as-prepared G-ACs, i.e., without any conductive additives, demonstrate high specific capacitance and high rate performance. The specific capacitances of optimized G-ACs, as measured in a 1 mol/L TEABF(4)/AN electrolyte and the neat ionic liquid EMIMBF4, are 155 and 176 F/g at 1 A/g, providing the high energy density of 39.2 and 74.9 W h/kg, respectively. In addition, the G-ACs exhibited excellent rate capability with a negligible capacitance decay from 0.5 to 10 A/g in both 1 mol/L TEABF(4)/AN and neat EMIMBF4 electrolytes. Furthermore, the optimized G-AC has a high energy density (68.5 W h/kg) at a relatively high power density (8501 W/kg), indicating that it holds potential for application in green energy storage.