標題: Chemical Vapor Deposition of Carbon Nanocoils Three-Dimensionally in Carbon Fiber Cloth for All-Carbon Supercapacitors
作者: Hu, Shin
Lee, Chi-Young
Chiu, Hsin-Tien
應用化學系
Department of Applied Chemistry
公開日期: 1-一月-2019
摘要: An Au/K bicatalyst-assisted chemical vapor deposition process using C2H2(g) to grow high-density carbon nanocoils (CNCs) uniformly on the fibers in carbon fiber cloth substrates three-dimensionally was developed. An as-deposited substrate (2.5 x 1.0 cm(2)) showed a high electrochemical active surface area (16.53 cm(2)), suggesting its potential usefulness as the electrode in electrochemical devices. The unique one-dimensional (1D) helical structure of the CNCs shortened the diffusion pathways of the ions in the electrolyte and generated efficient electron conduction routes so that the observed serial resistance R-s was low (3.7 Omega). By employing two-electrode systems, a liquid-state supercapacitor (SC) in H2SO4(aq) (1.0 M) and a solid-state SC with a polypropylene (PP) separator immersed in H2SO4(aq) (1.0 M)/polyvinylalcohol were assembled and investigated by using CNC-based electrodes. Both devices exhibited approximate rectangular shape profiles in the cyclic voltammetry measurements at various scan rates. The observations indicated their electric double-layer capacitive behaviors. From their galvanostatic charge/discharge curves, the specific capacitances of the liquid SC and the solid SC were measured to be approximately 137 and 163 F/g, respectively. In addition, the solid-state CNC-based SC possessed excellent energy density (15.3 W h/kg) and power density (510 W/kg). The light weight solid SC (0.1965 g, 2.5 x 1.0 cm(2)) was bendable up to 150 degrees with most of the properties retained.
URI: http://dx.doi.org/10.1021/acsomega.8b02215
http://hdl.handle.net/11536/148948
ISSN: 2470-1343
DOI: 10.1021/acsomega.8b02215
期刊: ACS OMEGA
Volume: 4
起始頁: 195
結束頁: 202
顯示於類別:期刊論文