Growth of vertically-aligned carbon nanotubes on graphite for electric double-layer capacitors. (31st May 2019)

• Record Type: Journal Article
• Authors: Yoneda, Daisuke; Suzuki, Seiya; Hiramoto, Satoshi; Matsuoka, Yuki; Hara, Masanori; Yoshimura, Masamichi
• Is Part Of: Materials research express. Volume 6:Number 8(2019)
• Publication Date: 2019-05-31
• Subjects: vertically aligned carbon nanotubes -- chemical vapor deposition -- carbon nanotubes/graphite electrode -- electric double layer capacitor -- plasma etching of graphite; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ab23dc
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: Recently, electric double-layer capacitors (EDLCs) have attracted great attention as an energy storage device with high input-output power density. In this study, we synthesized carbon nanotubes (CNTs)/graphite with high surface area as a novel electrode component for EDLC. CNTs were grown on a defective graphite surface by alcohol catalytic chemical vapor deposition for the first time. We found that oxidative plasma treatment time for graphite surface attributes to selective growth of laterally-aligned (LA) or vertically-aligned (VA) CNTs. Electrochemical analysis reveals VACNTs/graphite possesses the highest electrostatic capacity of 1.5 mF cm −2 among pristine graphite, LACNTs/graphite, and VACNTs/graphite. We suggest that increase of specific surface area with CNTs results in the increase of electrostatic capacity for the EDLC electrode. The results indicate that VACNTs/graphite electrodes are expected to improve the performance of EDLCs.