Fabrication and electrochemical characterization of super-capacitor based on three-dimensional composite structure of graphene and a vertical array of carbon nanotubes. (September 2018)

• Record Type: Journal Article
• Authors: Choi, Daniel; Yang, Eui-Hyeok; Gill, Waqas; Berndt, Aaron; Park, Jung-Rae; Ryu, Jong Eun
• Is Part Of: Journal of composite materials. Volume 52:Number 22(2018)
• Page Start: 3039
• Page End: 3044
• Publication Date: 2018-09
• Subjects: Super-capacitor -- 3D composite -- graphene -- carbon nanotubes; Composite materials -- Periodicals; Composites -- Périodiques; 620.118
• DOI: 10.1177/0021998318760154
• Languages: English
• ISSNs: 0021-9983

Abstract

We have demonstrated a three-dimensional composite structure of graphene and carbon nanotubes as electrodes for super-capacitors. The goal of this study is to fabricate and test the vertically grown carbon nanotubes on the graphene layer acting as a spacer to avoid self-aggregation of the graphene layers while realizing high active surface area for high energy density, specific capacitance, and power density. A vertical array of carbon nanotubes on silicon substrates was grown by a low-pressure chemical vapor deposition process using anodized aluminum oxide nanoporous template fabricated on silicon substrates. Subsequently, a graphene layer was grown by another low-pressure chemical vapor deposition process on top of a vertical array of carbon nanotubes. The Raman spectra confirmed the successful growth of carbon nanotubes followed by the growth of high-quality graphene. The average measured capacitance of the three-dimensional composite structure of graphene-carbon nanotube was 780 µFcm −2 at 100 mVs −1 .