Fluctuation Analysis

摘要

In electrochemical measurements, where electrical parameters are the very essence of scientific inquiry, resistance, and in extension impedance, can provide very valuable information. This has been recognized and exploited in measurements of electrochemical impedance spectroscopy (EIS), in particular in more recent years, when instruments or instrumental modules capable of this method became readily available. However, there is another method that allows obtaining electrical impedance: fluctuation analysis. Unlike EIS. which requires external perturbation of the system, fluctuation analysis relies entirely on the electrical signal originating in the random, thermally-driven fluctuations of the system. While both methods provide some identical information, they have also their unique capabilities. The merits of fluctuation analysis, the less familiar of the two methods, will be briefly outlined in this tutorial.