• 文献标题:   3-Dimensional Graphene Carbon Nanotube Carpet-Based Microsupercapacitors with High Electrochemical Performance
  • 文献类型:   Article
  • 作  者:   LIN J, ZHANG CG, YAN Z, ZHU Y, PENG ZW, HAUGE RH, NATELSON D, TOUR JM
  • 作者关键词:   3dimensional, microsupercapacitor, graphene, carbon nanotube carpet
  • 出版物名称:   NANO LETTERS
  • ISSN:   1530-6984
  • 通讯作者地址:   Rice Univ
  • 被引频次:   414
  • DOI:   10.1021/nl3034976
  • 出版年:   2013

▎ 摘  要

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 degrees 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 Vis enables the microdevices to demonstrate a maximum power density of 1.15 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.