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The Galvanostatic EIS technique is used to characterize an electrochemical interface. It is especially useful when the potential of the interface is changing with time. A small-signal AC-current excitation is applied to an electrochemical cell. The phase-sensitive AC voltage response of the interface is measured as the frequency of the excitation signal is varied.
Galvanostatic EIS can be useful in many areas of electrochemistry, including research in batteries, electrode kinetics, and industrial electrolysis. It can be used to measure the EIS spectrum of a battery while the battery is being discharged.