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The Electrochemical Energy Potentiostatic EIS technique is used to characterize the electrochemical interfaces within an energy device or cell which is held at a fixed potential. A small-signal AC potential excitation is applied to an electrochemical cell. The phase-sensitive AC response of the interface is measured as the frequency of the excitation signal is varied.
EIS is a particularly powerful tool and can be useful in many areas of electrochemistry, including research in batteries, fuel cells, supercapacitors, electrode kinetics, and industrial electrolysis. It can be used to measure the EIS spectrum of a battery while the battery is help at a constant potential.
The output of an EIS experiment is a complex impedance spectrum. The term complex is used in its mathematical sense: containing both real and imaginary terms. An EIS spectrum is usually graphed as either a Bode plot (impedance magnitude and phase plotted against frequency) or a Nyquist plot (imaginary impedance plotted against real impedance). Analysis of the impedance spectrum can give you the following information:
•Mechanistic and kinetic information
This is a half-cell, full-cell, stack, or dual-electrometer experiment. Dual-electrometer mode is only available with the Interface 5000.