Health & Environmental Research Online (HERO)


Print Feedback Export to File
1789518 
Journal Article 
3-Dimensional graphene carbon nanotube carpet-based microsupercapacitors with high electrochemical performance 
Lin, J; Zhang, C; Yan, Z; Zhu, Y; Peng, Z; Hauge, RH; Natelson, D; Tour, JM 
2013 
1 
Nano Letters
ISSN: 1530-6984
EISSN: 1530-6992 
13 
1 
72-78 
English 
23237453 
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.