State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha, China.
Nanoscale. 2012 Jul 7;4(13):3997-4001. doi: 10.1039/c2nr30779k. Epub 2012 Jun 7.
High-quality graphene scrolls (GSS) with a unique scrolled topography are designed using a microexplosion method. Their capacitance properties are investigated by cyclic voltammetry, galvanostatic charge-discharge and electrical impedance spectroscopy. Compared with the specific capacity of 110 F g(-1) for graphene sheets, a remarkable capacity of 162.2 F g(-1) is obtained at the current density of 1.0 A g(-1) in 6 M KOH aqueous solution owing to the unique scrolled structure of GSS. The capacity value is increased by about 50% only because of the topological change of graphene sheets. Meanwhile, GSS exhibit excellent long-term cycling stability along with 96.8% retained after 1000 cycles at 1.0 A g(-1). These encouraging results indicate that GSS based on the topological structure of graphene sheets are a kind of promising material for supercapacitors.
采用微爆炸法设计了具有独特卷曲形貌的高质量石墨烯卷（GSS）。通过循环伏安法、恒电流充放电和交流阻抗谱研究了它们的电容性能。与石墨烯片的比容量 110 F g(-1)相比，在 6 M KOH 水溶液中，电流密度为 1.0 A g(-1)时，由于 GSS 的独特卷曲结构，获得了显著的 162.2 F g(-1)的容量。容量值仅增加了约 50%，这仅仅是因为石墨烯片的拓扑变化。同时，GSS 在 1.0 A g(-1)下循环 1000 次后仍保持 96.8%的容量，表现出优异的长期循环稳定性。这些令人鼓舞的结果表明，基于石墨烯片拓扑结构的 GSS 是超级电容器的一种有前途的材料。
