Hydrodynamic electrodes transient techniques

The objective of analyzing EIS data is to elucidate the electrode process and to derive its characteristic parameters. It should be stressed here that EIS is a very sensitive technique, but it does not provide a direct measure of physical phenomena. Other electrochemieal experiments (dc, transients) should also be carried out, together with good physical knowledge of the system (solution and surface composition, thickness, porosity, the presence of various layers, hydrodynamic conditions, etc.). Interpretation of impedance data requires the use of an appropriate model. This is a quite difficult task that must be carried out very carefiiUy. 

The solution of this partial differential second-order equation depends on the initial and boundary conditions of the particular experiment, giving rise to a multitude of techniques. In Chapter 2.2, the digital simulation of voltammetry under stagnant and hydrodynamic conditions is described. By changing the electrode potential one can modify the boundary conditions and transient effects arise until a new steady state is reached. 

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