A mathematical model of an electrochemical capacitor with double-layer and faradaic processes

Journal Article · Wed Sep 01 00:00:00 EDT 1999 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1392450· OSTI ID:20003168

Lin, C; Ritter, J A; Popov, B N; White, R E

A mathematical model of an electrochemical capacitor with hydrous ruthenium oxide (RuO{sub 2}{center{underscore}dot}xH{sub 2}O) electrodes including both double-layer and surface faradaic processes is developed to predict the behavior of the capacitor under conditions of galvanostatic charge and discharge. The effect of RuO{sub 2}{center{underscore}dot}xH{sub 2}O particle size is studied and shows that the smaller the particles the better the performance because of the increased surface area per unit volume or mass. The model also predicts that the faradaic process increases significantly the energy per unit volume of the capacitor for power densities of 100 kW/L or less.

• Research Organization: Univ. of South Carolina, Columbia, SC (US)
• Sponsoring Organization: US Department of the Army; US Department of Energy
• DOE Contract Number: FC02-91ER75666
• OSTI ID: 20003168
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 9 Vol. 146; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
CAPACITIVE ENERGY STORAGE EQUIPMENT
ELECTRODES
MATHEMATICAL MODELS
PARTICLE SIZE
RUTHENIUM OXIDES
SURFACE AREA