Edge-Oriented Graphene on Carbon Nanofiber for High-Frequency Supercapacitors

• 作 者: Nazifah Islam Juliusz Warzywod
• 机 构: Department of Electrical and Computer Engineering and Nano Tech Center,Texas Tech University,Lubbock
• 出 处: 纳微快报（英文）
• 发表日期: 2018年1期
• 关键词: High-frequency supercapacitor Kilohertz supercapacitor Vertical graphene Carbon

High-frequency supercapacitors are being stud-ied 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?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.