Spline Interpolation Uesed in Electronchemical Impedance Spectroscopy

Electrochemical impedance spectroscopy (EIS) is one of the important means in the study of surface dynamics during complex electrodes reaction. Two signal techniques are used in the EIS: the frequency-domain and time-domain techniques. Electrochemical impedance spectroscopy measurement based on the fast Fourier transformation (FFT), which can probe transient electrochemical processes, is highly regarded in recent years because of its significant advantages, such as small disturbances to the electrochemical systems, high test speed, and accurate result in the low-frequency test. However, problems involving signal procession have always existed, such as unperfect signal period. This paper focuses primarily on the signal reconstruction step before the FFT processing. In this paper, the cubic spline interpolation will be used and discussed.