Open AccessCarbon-Based Fibrous EDLC Capacitors and Supercapacitors
Author(s) -
Constantina Lekakou,
O. Moudam,
Foivos Markoulidis,
T. Andrews,
John F. Watts,
Graham T. Reed
Publication year - 2011
Publication title -
journal of nanotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.347
H-Index - 29
eISSN - 1687-9511
pISSN - 1687-9503
DOI - 10.1155/2011/409382
Subject(s) - materials science , supercapacitor , carbon nanotube , separator (oil production) , electrode , capacitor , composite material , capacitance , cyclic voltammetry , electrolyte , electrolytic capacitor , electrochemistry , carbon fibers , voltage , composite number , electrical engineering , chemistry , engineering , physics , thermodynamics
This paper investigates electrochemical double-layer capacitors (EDLCs) including two alternative types of carbon-based fibrous electrodes, a carbon fibre woven fabric (CWF) and a multiwall carbon nanotube (CNT) electrode, as well as hybrid CWF-CNT electrodes. Two types of separator membranes were also considered. An organic gel electrolyte PEO-LiCIO4-EC-THF was used to maintain a high working voltage. The capacitor cells were tested in cyclic voltammetry, charge-discharge, and impedance tests. The best separator was a glass fibre-fine pore filter. The carbon woven fabric electrode and the corresponding supercapacitor exhibited superior performance per unit area, whereas the multiwall carbon nanotube electrode and corresponding supercapacitor demonstrated excellent specific properties. The hybrid CWF-CNT electrodes did not show a combined improved performance due to the lack of carbon nanotube penetration into the carbon fibre fabric
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