• 文献标题:   Edge-Oriented Graphene on Carbon Nanofiber for High-Frequency Supercapacitors
  • 文献类型:   Article
  • 作  者:   ISLAM N, WARZYWODA J, FAN ZY
  • 作者关键词:   highfrequency supercapacitor, kilohertz upercapacitor, vertical graphene, carbon nanofiber, ac iltering
  • 出版物名称:   NANOMICRO LETTERS
  • ISSN:   2311-6706 EI 2150-5551
  • 通讯作者地址:   Texas Tech Univ
  • 被引频次:   21
  • DOI:   10.1007/s40820-017-0162-4
  • 出版年:   2018

▎ 摘  要

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.