Classical Models of the Interface between an Electrode and an Electrolyte
نویسندگان
چکیده
An electrical double layer (EDL) plays a major role in understanding the interface between a charged surface (e.g. an implant) and ionic liquids (e.g. body fluids). The three classical models of the EDL (Helmholtz, Gouy – Chapman and Stern Model) are numerically solved for a flat surface electrode in the 3D Electrostatics mode of Comsol Multiphysics 3.5a Software. The values of the electric potential drop near the electrode’s surface are compared and it is shown their area of validity. The double layer capacitance is computed analytically, numerically and measured by Electrochemical Impedance Spectroscopy (EIS) and it has been shown that the classical models do not agree with the experimental measurements.
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