This book covers the fundamental aspects and the application of electrochemical impedance spectroscopy (EIS), with emphasis on a step-by-step procedure for mechanistic analysis of data. It enables the reader to learn the EIS technique, correctly acquire data from a system of interest, and effectively interpret the same. Detailed illustrations of how to validate the impedance spectra, use equivalent circuit analysis, and identify the reaction mechanism from the impedance spectra are given, supported by derivations and examples. MATLAB(R) programs for generating EIS data under various conditions are provided along with free online video lectures to enable easier learning.Features:Covers experimental details and nuances, data validation method, and two types of analysis - using circuit analogy and mechanistic analysisDetails observations such as inductive loops and negative resistances Includes a dedicated chapter on an emerging technique (Nonlinear EIS), including code in the supplementary material illustrating simulationsDiscusses diffusion, constant phase element, porous electrodes, and filmsContains exercise problems, MATLAB codes, PPT slide, and illustrative examplesa This book is aimed at senior undergraduates and advanced graduates in chemical engineering, analytical chemistry, electrochemistry, and spectroscopy.