Supercapacitors based on high-quality graphene scrolls.
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.
State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha, China.
Fanyan
F
Zeng
Yafei
Y
Kuang
Gaoqin
G
Liu
Rui
R
Liu
Zhongyuan
Z
Huang
Chaopeng
C
Fu
Haihui
H
Zhou