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An alternative approach to develop a large signal time dependent model of a simple electrochemical capacitor is proposed. A simple planar electrochemical cell consisting of two metal electrodes separated by a sulfuric acid electrolyte layer is modeled from first principles. The model is a large signal time dependent model and is valid under constant temperature conditions. The model is based on the...
This paper deals with the fractional order modelling of the supercapacitor voltage response for a given current profile. The model is obtained using the porous electrode theory applied on the supercapacitor case. In order to simplify the complexity of the model, it is assumed that there is no diffusion process in the electrolyte. These assumption leads to neglect the supercapacitor self-discharge...
The main goal of this paper is to establish a link between the ultracapacitors impedance at low frequency and slow phenomena such as self-discharge and charge recovery. Usually these phenomena are studied in the time domain. However, additional information can be extracted from specific characterization methods in the frequency domain like impedance spectroscopy. In this way, we intend to introduce...
With applied potential, the current distribution at the surface of a disk electrode is spatially nonuniform and time dependent. This distribution is important to control in applications that desire a uniform current density profile or minimal corrosion. We examine the current density profile of a capacitive disk electrode subjected to a voltage-step using finite element analysis software to solve...
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