Electrochemical Impedance Spectroscopy (EIS) is a very powerful tool for the analysis of
complex electrochemical systems. See the Basics of EIS application note for a comprehensive introduction to EIS. For the most part, information in that Application Note
will not be repeated here.
This Note is a practical discussion of the most common method for EIS data analysis. It
should provide even a novice with the basic approach for converting an EIS spectrum into
meaningful insights into the physical processes in his electrochemical cell. It intentionally
avoids most of the complex math associated with EIS data analysis.