摘要
以荞麦芯为前驱体,通过一种简单有效的一步活化方法制备分层多孔碳。制备得到的多孔碳具有高比表面积(805.91 m^(2)/g)和高孔隙体积(0.60 cm^(3)/g)。在三电极体系下,以0.5 A/g电流密度充放电,多孔碳在6 mol/L KOH中提供了330 F/g的超高电容。特别是当电流密度增加到100 A/g时,其电容仍可达到140 F/g。此外,在双电极系统中,其多孔碳构建的对称电容器在6 mol/L KOH电解液中可提供6.1 W·h/kg的输出。因此,这项研究为超级电容器电极材料提供了一条简单低成本的制备方法。
We propose a simple and effective one-step activation route to prepare a hierarchically porous carbon with buckwheat core acting for precursor.The as-obtained porous carbon(BCPC-3)shows high specific surface area(805.91 m^(2)/g)and high pore volume(0.60 cm^(3)/g).As a supercapacitor electrode material for three-electrode,porous carbon delivers an ultrahigh capacitance of 330 F/g(at 0.5 A/g)in 6 mol/L KOH.In particular,it displays a capacitance of 140 F/g even when the current density increases to 100 A/g.In addition,in the two-electrode system,a symmetric supercapacitor based on buckwheat core with a controlled carbon structure can provide an output of 6.1 W·h/kg in a 6 mol/L KOH electrolyte.Therefore,this research offers a straightforward and cost-effective pathway for the fabrication of superior supercapacitor electrode materials.
作者
欧俊科
张宏伟
雷英
李开阳
李博
邓海鑫
王昊
邹亮
OU Jun-ke;ZHANG Hong-wei;LEI Ying;LI Kai-yang;LI Bo;DENG Hai-xin;WANG Hao;ZOU Liang(School of Mechanical Engineering,Chengdu University,Chengdu 610106,China;Institute for Advanced Study,Chengdu University,Chengdu 610106,China;Materials Corrosion and Protection Key Laboratory of Sichuan Province,Sichuan University of Science and Engineering,Zigong 643000,China;Key Laboratory of Coarse Cereal Processing of Ministry of Agriculture and Rural Affairs(Chengdu University),Chengdu 610106,China)
基金
Project(2081919032) supported by the Chengdu University Startup Funding,China
Project(2020CC011) supported by the Opening Project of Key Laboratory of Coarse Cereal Processing of Ministry of Agriculture and Rural Affairs,China。
关键词
荞麦芯
多孔碳
超级电容器
buckwheat core
porous carbon
supercapacitor
