Journal
NANO LETTERS
Volume 13, Issue 1, Pages 72-78Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl3034976
Keywords
3-Dimensional; microsupercapacitors; graphene; carbon nanotube carpets
Categories
Funding
- Boeing
- AFOSR MURI [FA9550-12-1-0035]
- Sandia National Laboratory [1100745]
- Lockheed Martin Corporation through the LANCER IV Program
- ONR MURI program [00006766, N00014-09-1-1066]
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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.
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