Journal
NANO-MICRO LETTERS
Volume 10, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-017-0162-4
Keywords
High-frequency supercapacitor; Kilohertz upercapacitor; Vertical graphene; Carbon nanofiber; AC iltering
Funding
- National Science Foundation [1611060]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1611060] Funding Source: National Science Foundation
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High-frequency supercapacitors are being studied with the aim to replace the bulky electrolytic capacitors for current ripple filtering and other functions used in power systems. Here, 3D edge-oriented graphene (EOG) was grown encircling carbon nanofiber (CNF) framework to form a highly conductive electrode with a large surface area. Such EOG/CNF electrodes were tested in aqueous and organic electrolytes for high-frequency supercapacitor development. For the aqueous and the organic cell, the characteristic frequency at -45 degrees phase angle was found to be as high as 22 and 8.5 kHz, respectively. At 120 Hz, the electrode capacitance density was 0.37 and 0.16 mF cm(-2) for the two cells. In particular, the 3 V high-frequency organic cell was successfully tested as filtering capacitor used in AC/DC converter, suggesting the promising potential of this technology for compact power supply design and other applications.
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