title: 3-Dimensional graphene carbon nanotube carpet-based microsupercapacitors with high electrochemical performance.
abstract: In this research, 3-dimensional (3D) graphene/carbon nanotube carpets (G/CNTCs)-based microsupercapacitors (G/CNTCs-MCs) were fabricated in situ on nickel electrodes. The G/CNTCs-MCs show impedance phase angle of -81.5° at a frequency of 120 Hz, comparable to commercial aluminum electrolytic capacitors (AECs) for alternating current (ac) line filtering applications. In addition, G/CNTCs-MCs deliver a high volumetric energy density of 2.42 mWh/cm(3) in the ionic liquid, more than 2 orders of magnitude higher than that of AECs. The ultrahigh rate capability of 400 V/s enables the microdevices to demonstrate a maximum power density of 115 W/cm(3) in aqueous electrolyte. The high-performance electrochemical properties of G/CNTCs-MCs can provide more compact ac filtering units and discrete power sources in future electronic devices. These elevated electrical features are likely enabled by the seamless nanotube/graphene junctions at the interface of the differing carbon allotropic forms.
authors.affiliation: Department of Mechanical Engineering and Material Science, Rice University, 6100 Main St., Houston, Texas 77005, USA.
authors.forename: Jian
authors.initials: J
authors.lastname: Lin
authors.forename: Chenguang
authors.initials: C
authors.lastname: Zhang
authors.forename: Zheng
authors.initials: Z
authors.lastname: Yan
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhu
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Peng
authors.forename: Robert H
authors.initials: RH
authors.lastname: Hauge
authors.forename: Douglas
authors.initials: D
authors.lastname: Natelson
authors.forename: James M
authors.initials: JM
authors.lastname: Tour