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

作     者：WANG Bin XIE PengYi ZHANG Miao ZHANG HongTao CHEN YongSheng 

作者机构：School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China School of Chemistry and Materials ScienceGuangdong University of EducationGuangzhou 510303China The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsInstitute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China Research Center for Advanced Information Materials(CAIM)Huangpu Research&Graduate School of Guangzhou UniversityGuangzhou 510555China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2022年第65卷第12期

页      面：2866-2873页

核心收录：

学科分类：081702[工学-化学工艺] 080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China (Grant No. 21905297) Guangdong Provincial Universities Characteristic Innovation Project (Grant No. 2019KTSCX120) Science and Technology Program of Guangzhou (Grant Nos. 202102010378, 202102020331) Open Fund of the State Key Laboratory of Luminescent Materials and Devices, South China University of Technology (Grant No. 2019-skllmd-06) 

主　　题：supercapacitor asphalt porous carbon rate capability 

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 EMIMBF_(4), 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 EMIMBF_(4) 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.