![]() ![]() When fitting impedance data to equivalent circuits, adding a circuit element generally improves the fit, though the addition may not be statistically significant. I have made a Maple program available free to Maple users, which fits any impedance expression, and generates the usual statistical outputs. While fitting to equivalent circuits is possible in many commercial programs, it is harder to fit arbitrary impedance expressions, e.g., those arising from a kinetic model. Harrington, Dynamic Electrochemical Impedance Spectroscopy for Electrocatalytic Reactions, Electrochim. Harrington, Dynamic Electrochemical Impedance Spectroscopy, ECS Transactions, 19 (2009) 31-42. ![]() See the main publications list for application papers. Ref 1 describes the hardware, and Ref 2 describes the software, algorithms, and capabilities and limitations of the method. Later, we developed hardware and software to acquire and analyse impedance spectra through the multisine method. Our early work used lock-in amplifier methods. Impedance spectra are acquired while the system is slowly changing, usually in a slow sweep voltammogram, which allows the study of surface electrochemistry under conditions that may not be accessible by conventional steady-state impedance. In 1997 we first used dynamic impedance (dEIS) to study Pt oxide growth. ![]()
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