Electrochemical impedance spectroscopy eis or ac impedance methods have seen tremendous increase in popularity in recent years initially applied to the determination of the double layer capacitance1 4 and in ac polarography5 7 they are now applied to the characterization of electrode processes and complex interfaces. Electrochemical impedance spectroscopy has become a mature and well understood technique it is now possible to acquire validate and quantitatively interpret the experimental impedances. Electrochemical impedance spectroscopy has become a mature and well understood technique it is now possible to acquire validate and quantitatively interpret the experimental impedances this chapter has been addressed to understanding the fundamental processes of diffusion and faradaic reaction . This book presents a complete overview of the powerful but often misused technique of electrochemical impedance spectroscopy eis the book presents a systematic and complete overview of eis the book carefully describes eis and its application in studies of electrocatalytic reactions and other electrochemical processes of practical interest. Different ac frequencies and thus the name impedance spectroscopy was later adopted analysis of the system response contains information about the interface its structure and reactions taking
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