title: Highly conductive and porous activated reduced graphene oxide films for high-power supercapacitors.
abstract: We present a novel method to prepare highly conductive, free-standing, and flexible porous carbon thin films by chemical activation of reduced graphene oxide paper. These flexible carbon thin films possess a very high specific surface area of 2400 m(2) g(-1) with a high in-plane electrical conductivity of 5880 S m(-1). This is the highest specific surface area for a free-standing carbon film reported to date. A two-electrode supercapacitor using these carbon films as electrodes demonstrated an excellent high-frequency response, an extremely low equivalent series resistance on the order of 0.1 ohm, and a high-power delivery of about 500 kW kg(-1). While higher frequency and power values for graphene materials have been reported, these are the highest values achieved while simultaneously maintaining excellent specific capacitances and energy densities of 120 F g(-1) and 26 W h kg(-1), respectively. In addition, these free-standing thin films provide a route to simplify the electrode-manufacturing process by eliminating conducting additives and binders. The synthetic process is also compatible with existing industrial level KOH activation processes and roll-to-roll thin-film fabrication technologies.
authors.affiliation: Department of Mechanical Engineering and the Materials Science and Engineering Program, The University of Texas at Austin, One University Station C2200, Austin, Texas 78712, USA.
authors.forename: Li Li
authors.initials: LL
authors.lastname: Zhang
authors.forename: Xin
authors.initials: X
authors.lastname: Zhao
authors.forename: Meryl D
authors.initials: MD
authors.lastname: Stoller
authors.forename: Yanwu
authors.initials: Y
authors.lastname: Zhu
authors.forename: Hengxing
authors.initials: H
authors.lastname: Ji
authors.forename: Shanthi
authors.initials: S
authors.lastname: Murali
authors.forename: Yaping
authors.initials: Y
authors.lastname: Wu
authors.forename: Stephen
authors.initials: S
authors.lastname: Perales
authors.forename: Brandon
authors.initials: B
authors.lastname: Clevenger
authors.forename: Rodney S
authors.initials: RS
authors.lastname: Ruoff