石墨烯量子点在超级电容器导电剂中的应用  

Application of graphene quantum dots in conductive agent of supercapacitors

作　　者：时志强[1,2] 牛永芳 段建[3] 王静 张进[1,2] SHI Zhi-qiang1,2,NIU Yong-fang1,2,DUAN Jian3,WANG Jing1,2,ZHANG Jin1,2(1. Tianjin Municipal Key Laboratory of Advanced Fiber and Energy Storage, Tianjin Polytechnic University, Tianjin 300387, China, 2. School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China, 3. Informatization Center, Tianjin Polytechnic University, Tianjin 300387, Chin)

机构地区：[1]天津工业大学天津市先进纤维与储能技术重点实验室,天津300387 [2]天津工业大学材料科学与工程学院,天津300387 [3]天津工业大学信息化中心,天津300387

出　　处：《天津工业大学学报》2018年第3期49-54,88,共7页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(51603147);天津市自然科学基金资助项目(15ZCZDGX00270;14RCHZGX00859)

摘　　要：为研究石墨烯在超级电容器中的导电效果,将石墨烯量子点(GQDs)代替商品化导电炭黑(CB)用作新型纳米尺寸(~10 nm)的导电剂,分别采用直接液相复合和热还原复合方式制备具有良好导电网络的AC-G和AC-HG系列电极,并考察两种复合方式对活性炭电极结构特性与双电层电容性能的影响.结果表明:添加1%GQDs的AC电极呈现出优异的比电容和倍率性能,当电流密度从0.1 A/g增加到10 A/g,其比电容由110 F/g降到85 F/g,明显优于添加10%CB的AC电极(100 F/g降为65 F/g);热处理过程大幅去除了GQDs所带含氧官能团,AC-HG电极的电子电导率提高而离子电导率降低,因此其倍率性能略有下降,但循环稳定性大幅提高.In order to research the conductive effect of graphene in the supercapacitors, graphene quantum dots（GQDs）were directly used as a novel nano-sized（about 10 nm） conductive additive instead of the common carbon black（CB） to prepare composite electrodes with effective conductive network. Composite electrodes of AC-G and ACHG were prepared from GQDs and activated carbon（AC） by liquid-phase mixing and thermal reduction recombination respectively. The effects of the two composite methods on the structural characteristics of AC electrode and the performance for the electrical double-layer capacitors were investigated. The results showed that the specific capacitance（SC） and rate performance were enhanced for the electrodes with 1% GQDs as conductive additive, compared with that with 10% CB. The corresponding SC values declined from 110 F/g to 85 F/g, 100 F/g to 65 F/g, respectively, when the current density varied from 0.1 A/g to 10 A/g; the oxygen functional groups were removed from GQDs by the thermal reduction, which enhanced the electronic conductivity at the expense of decline of the ionic conductivity for the AC-HG electrode. As a result, its rate performance slightly decreased,but a substantial increase in cycle stability.

关 键 词：石墨烯量子点 导电添加剂 超级电容器 含氧官能团 

分 类 号：TM53[电气工程—电器]