Electric double-layer capacitor using composites composed of phosphoric acid-doped silica gel and styrene-ethylene-butylene-styrene elastomer as a solid electrolyte

Citation
A. Matsuda et al., Electric double-layer capacitor using composites composed of phosphoric acid-doped silica gel and styrene-ethylene-butylene-styrene elastomer as a solid electrolyte, J POWER SOU, 77(1), 1999, pp. 12-16
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics","Environmental Engineering & Energy
Journal title
JOURNAL OF POWER SOURCES
ISSN journal
0378-7753 → ACNP
Volume
77
Issue
1
Year of publication
1999
Pages
12 - 16
Database
ISI
SICI code
0378-7753(19990101)77:1<12:EDCUCC>2.0.ZU;2-X
Abstract
Solid state electric double-layer capacitors have been fabricated using a c omposite composed of H3PO4-doped silica gel and styrene-ethylene-butylene-s tyrene elastomer as the electrolyte. A composite hybridized with activated carbon powders (ACP) was the polarizable electrode. The cyclic voltammogram of the electric double-layer capacitor fabricated demonstrated that electr ic charge was stored in the electric double-layer at the interface between the polarizable electrode and the electrolyte. Resistance of the capacitor obtained from impedance plots in ambient air was smaller by three orders of magnitude than that of the capacitor in a dry Ar atmosphere. The drastic d ecrease in the resistance should be ascribed to the increase in the proton conductivity of the composite due to the water adsorption in H3PO4-doped si lica gel in an ambient atmosphere. The value of capacitance of the capacito r in an ambient atmosphere was 10 F/(gram of total ACP), which was 10 times larger than that of the capacitor in a dry Ar atmosphere. The large capaci tance of the capacitor in an ambient atmosphere is attributable to the form ation of electric double-layer with large electric charge at the interface between the composite and ACP in the capacitor due to the water adsorption. (C) 1999 Elsevier Science S.A. All rights reserved.