title: Electrospray-deposition of graphene electrodes: a simple technique to build high-performance supercapacitors.
abstract: Here we report an electrostatic spray deposition method to prepare three-dimensional porous graphene electrodes for supercapacitor applications. The symmetric supercapacitor exhibits excellent specific capacitance (366 F g(-1) at 1 A g(-1) in 6 M KOH) and long cycle life (108% capacitance retention up to 40 000 cycles). Moreover, the energy densities of the organic and aqueous electrolyte based supercapacitors reach 22.9 and 8.1 Wh kg(-1) when the power densities are 119.2 and 15.4 kW kg(-1), respectively. Compared with the previously reported graphene based supercapacitors, the improved properties could be attributed to the excellent three-dimensional open porous electrode structure, which is favorable for the ion diffusion and electron transport. In addition, this method provides a simple electrode-fabrication route without the involvement of conducting additives and binders. It may find vast applications in thin and miniaturized energy storage scenarios.
authors.affiliation: Division of Energy and Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, P. R. China. yang.cheng@sz.tsinghua.edu.cn.
authors.forename: Huaichao
authors.initials: H
authors.lastname: Tang
authors.forename: Cheng
authors.initials: C
authors.lastname: Yang
authors.forename: Ziyin
authors.initials: Z
authors.lastname: Lin
authors.forename: Quanhong
authors.initials: Q
authors.lastname: Yang
authors.forename: Feiyu
authors.initials: F
authors.lastname: Kang
authors.forename: Ching Ping
authors.initials: CP
authors.lastname: Wong