Chemical Physics Letters ( IF 2.8 ) Pub Date : 2017-12-20 , DOI: 10.1016/j.cplett.2017.12.052 Jing Li , Jie Tang , Jinshi Yuan , Kun Zhang , Xiaoliang Yu , Yige Sun , Han Zhang , Lu-Chang Qin
Carbon nanotubes (CNTs) are an effective spacer to prevent the re-stacking of graphene layers. However, the aggregation of CNTs always reduces the specific surface area of resulting CNT/graphene composites. Meanwhile, different pores always have different contributions to the specific capacitance. In this study, CNT/graphene composites with different porous structures are synthesized by co-reduction of oxidized CNTs and graphene oxide with different mixing ratios. With an optimized CNT content of 20%, the CNT/graphene composite shows 206 F g-1 in 1-ethyl-3-methylimidazolium tetrafluoroborate electrolyte. It is found that pores larger than twice the size of electrolyte ions can make greater contributions to the specific capacitance.
中文翻译:
高性能超级电容器用多孔碳纳米管/石墨烯复合材料
碳纳米管(CNT)是防止石墨烯层重新堆积的有效间隔物。但是,CNT的聚集总是会降低所得CNT /石墨烯复合材料的比表面积。同时,不同的孔总是对比电容具有不同的贡献。在这项研究中,通过将具有不同混合比的氧化碳纳米管和氧化石墨烯共还原,可以合成具有不同多孔结构的碳纳米管/石墨烯复合材料。CNT /石墨烯复合材料的最佳CNT含量为20%,在1-乙基-3-甲基咪唑鎓四氟硼酸酯电解质中显示206 F g -1。发现大于电解质离子尺寸两倍的孔可以对比电容做出更大的贡献。