A Poisson-Boltzmann Description for the Double-Layer Capacitance of an Electolytic Cell

Details A Poisson-Boltzmann Description for the Double-Layer Capacitance of an Electolytic Cell A Poisson-Boltzmann Description for the Double-Layer Capacitance of an Electolytic Cell

2012-04-01

arxiv.org/abs/1204.0204v1

Physics

Condensed Matter

Statistical Mechanics

5 figures

Scientific paper

A Poisson-Boltzmann approach is used to determine the double-layer integral and differential capacitances in a finite-length situation for an electrolytic cell. By means of simple analytical calculations, it is shown how these quantities exhibit the bell-like and the camel-like shapes as a function of the applied voltage, when the thickness of the sample or the surface charge are varied. The problem is formulated treating the bulk liquid as a member of a grand canonical ensemble in contact with blocking electrodes. As a consequence, an applied voltage dependent Debye's screening length arises as a fundamental length governing the electrical behavior of the system.

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