石墨烯/碳点复合物的制备及其电化学性能研究  

Preparation and electrochemical properties study of graphene/carbon quantum dots composite

作　　者：张庆国[1,2] 刘海超[1] 张鑫源[1] 李美超[1] 金振兴[1,2] 

机构地区：[1]渤海大学化学化工与食品安全学院,辽宁锦州121013 [2]渤海大学超级电容器工程技术研究中心,辽宁锦州121013

出　　处：《电子元件与材料》2014年第5期29-32,共4页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.21003081;No.21373002);辽宁省高校优秀人才支持计划资助项目(No.LJQ2013116)

摘　　要：以石墨烯和碳量子点(碳点)的乙醇溶液为原料,采用一步煅烧法制得了新型的石墨烯/碳点复合物(GP/CQD),利用扫描电子显微镜(SEM)和X射线衍射(XRD)对其结构及表面形貌进行了表征。通过循环伏安、交流阻抗和恒流充放电等测试手段对材料的电化学性能进行了研究。结果表明,碳点的复合能在一定程度上减弱石墨烯片层的堆砌作用进而增大电极的比表面积,有利于电解质的浸润和电子的传输。这种石墨烯/碳点超级电容器的恒流充放电效率高达92.1%,比容量高达245.7 F/g,且在大扫速下仍可保持良好的超电容性能。A novel graphene/carbon quantum dots （GP/CQD） composite was synthesized with graphene and carbon quantum dots in ethanol solution via a simple calcination method. The structure and surface morphology of the prepared composite were characterized by scanning electron microscope （SEM） and X-ray diffraction （XRD）. The electrochemical properties of the prepared samples were investigated by cyclic voltammetry （CV）, electrochemical impedance spectroscopy （EIS） and galvanostatic charge-discharge tests. The results show that the carbon quantum dots acting as spacers create gaps between graphene sheets, resulting in a high surface area, which electively increases the electrolyte accessibility and electronic transmission. The supercapacitor with GP/CQD as electrode material exhibits high charge-discharge efficiency （92.1%） and specific capacity （245.7 F/g）, meanwhile the supercapacitor can keep good performance under large scan rates.

关 键 词：石墨烯 碳点 复合物 超级电容器 电化学性能 比容量 

分 类 号：TM835[电气工程—高电压与绝缘技术]