螺旋碳管插层还原氧化石墨烯制备自组装超级电容器

Preparation of helical CNTs intercalation reduction graphene oxide for self-assembled supercapacitors

石墨烯基超级电容器电极面临着层间堆叠的问题,使用独特的螺旋碳管(HCNTs)插层还原氧化石墨烯(rGO),采用自组装的方法构建3D全碳网络,直接用于无黏结剂的超级电容器电极(rGO&HCNTs),可有效减少石墨烯的堆叠。rGO包裹具有类弹簧结构的HCNTs,这种3D网络极大地增加了电极的比表面积,提高了电荷转移速率,并且全碳结构具有较好的稳定性。rGO&HCNTs电极在0.25 A/g的电流密度下,表现出296 F/g的比电容,在1 A/g的电流密度充电/放电循环3 000圈之后,比容量为初始的89%。这种复合材料是高性能超级电容器及柔性电极的潜在候选材料。

Graphene-based supercapacitor electrodes have the problem of interlayer stacking.A unique helical CNTs(HCNTs) is used to intercalate the layers of reduction graphene oxide(rGO) to construct 3D all-carbon network by self-assembly,which is directly applied to the binder-free supercapacitor electrodes(rGO&HCNTs).This 3D structure greatly increases the specific surface area of the electrode,and improves the charge transfer rate.In addition,the all-carbon structure has better stability.The rGO&HCNTs electrode exhibits a specific capacitance of 296 F/g at a current density of 0.25 A/g.Moreover,the rGO&HCNTs electrodes exhibit 89% capacitance retention after 3 000 cycles at a current density of 1 A/g.The composite is a potential candidate for high-performance supercapacitors and flexible electrodes.