摘要
以柠檬酸为原料,通过碳化制备石墨烯量子点(GQD)溶液,对制备的石墨烯量子点溶液进行超声使石墨烯量子点吸附在石墨毡表面。采用场发射扫描电子显微镜(FE-SEM)、X射线光电子能谱(XPS)和喇曼光谱对石墨烯量子点修饰的石墨毡进行表征。通过循环伏安(CV)曲线、电化学阻抗谱(EIS)和计时电位法研究其电化学性能。测试发现,该石墨毡电极在电流密度1 mA·cm-2下比电容高达2394 F/g,在电流密度4 mA·cm-2下经过5000次循环后稳定性达到95%。结果表明石墨烯量子点修饰的石墨毡电极具有优异的电化学性能,可以成为极具应用前景的超级电容器的电极材料。
The graphene quantum dots(GQDs)solution was prepared by carbonization using citric acid as the raw material,and the GQDs in the prepared GQDs solution were ultrasonically adsorbed on the surface of the graphite felt.The graphite felts modified by GQDs were characterized by the field emission scanning electron microscopy(FE-SEM),X-ray photoelectron spectroscopy(XPS)and Raman spectroscopy.Besides,the electrochemical properties of the graphite felt electrodes modified by GQDs were investigated by the cyclic voltammetry(CV)curve,electrochemical impedance spectroscopy(EIS)and chronopotentiometry.It is found that the graphite felt electrodes modified by GQDs have a specific capacitance up to 2394 F/g at the current density of 1 mA·cm-2,and a stability of 95%after 5000 cycles at the current density of 4 mA·cm-2.The results indicate that the graphite felt electrode modified by GQDs possesses excellent electrochemical properties,and can be used as the electrode materials for the supercapacitors with highly promising application prospects.
作者
陈南
庞宁
童新
徐少辉
熊大元
王连卫
Chen Nan;Pang Ning;Tong Xin;Xu Shaohui;Xiong Dayuan;Wang Lianwei(School of Communication and Electronic Engineering,East China Normal University,Shanghai 200241,China)
出处
《微纳电子技术》
北大核心
2020年第2期119-124,共6页
Micronanoelectronic Technology
基金
国家自然科学基金资助项目(61176108)
上海市科学技术委员会资助项目(14DZ2260800).
关键词
石墨烯量子点(GQD)
超声
石墨毡
超级电容器
电化学性能
graphene quantum dot(GQD)
ultrasonication
graphite felt
supercapacitor
electrochemical property
作者简介
陈南(1994—),男,江苏宿迁人,硕士研究生,研究方向为微机械系统;通信作者:王连卫(1965—),男,江苏淮安人,研究员,研究方向为微机械系统。E-mail:Lwwang@ee.ecnu.edu.cn
