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

摘要

A mathematical model of an electrochemical capacitor with hydrous ruthenium oxide (RUO_2.H_2O) electrodes including both double-layer and surface Faradaic processes is developed to predict the behavior of the capacitor under the conditions of galvanostatic charge/discharg. The effect of RuO_2 centre dot _xH_2O particle size is studied an 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 ignificantly the energy per unit volume of the capacitor for power densities of 100 kW/L or less.