The effect of nickel foam current collector in carbon electrode based electric double layer capacitor

Citation
Jh. Kim et al., The effect of nickel foam current collector in carbon electrode based electric double layer capacitor, ELECTROCH, 69(11), 2001, pp. 853-857
Citations number
4
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
ELECTROCHEMISTRY
ISSN journal
1344-3542 → ACNP
Volume
69
Issue
11
Year of publication
2001
Pages
853 - 857
Database
ISI
SICI code
1344-3542(200111)69:11<853:TEONFC>2.0.ZU;2-M
Abstract
Activated carbon (AC) powder as an active electrode material and open-pore nickel foam as a current collector material were used for an electric doubl e layer capacitor (EDLC) with an aqueous electrolyte of KOH mixture. The el ectrochemical characteristics of the EDLC: being made of 3 cm by 3 cm elect rode size were investigated by charge-discharge cycle tests, impedance anal yzer and cyclic voltametry measurements. As a current collector, nickel foa m with concave surface and many open-pore showed larger specific capacitanc e and lower impedance than that of nickel foil with a flat surface. As resu lts from experiments, much improved specific capacitance of about 300 F/g a t 40 mA/cm(2) of discharge current density and fairly low specific ESR of 0 .63 Omega cm(2) at 1 kHz were obtained from the EDLC with the nickel foam c urrent collector. The specific leakage current was measured as 0.18 mA/cm(2 ) with respect to the apparent electrode area of the EDLC with nickel foam current collector.