Impedance interpretation Mott-Schottky plots

FRA systems are versatile, and they can be controlled to acquire and analyse the data required to construct Mott-Schottky plots, for example. Unfortunately, the ease of use of FRA-fitting software can lead to errors of interpretation that arise from a failure to relate fitting elements to the physical system. Several equivalent circuits may give the same frequency-dependent impedance response. No a priori distinction between degenerate circuits is possible, ft is necessary to study the system response as a function of additional experimental variables (DC voltage, concentration, mass transport conditions etc.) in order to establish whether the circuit elements are related in a predictable way to a model of the physical system. 

Of the techniques discussed in this chapter, impedance measurements are arguably the most complicated measurements to perform and interpret. The discussion below is limited to the most common form of impedance analysis used in solar water splitting research measuring a Mott-Schottky plot to determine the donor density... 

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