In this chapter, an overview is presented of the state of the art concerning the fundamental properties of electrode polarization (EP) of interest in the measurement of high conductivity samples and its implications to both dielectric (DS) and impedance spectroscopy (IS). Initially a detailed description of what constitutes EP is provided and the problems that it induces. Then, the chapter reviews some of the more popular models that have been used to describe the physical phenomena behind the formation of the ionic double layer. Following this, the chapter enumerates the common strategies used historically to correct its influence on the measured signals in DS or in IS. Finally, it also reviews recent attempts to employ fractal electrodes to by-pass the effects of EP and to offer some physical explanation as to the limitations of their use.
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