A complete impedance analysis of electrochemical cells used as energy sources

作者：Slepski P; Darowicki K; Janicka E^*; Lentka G

来源：Journal of Solid State Electrochemistry, 2012, 16(11): 3539-3549.

DOI：10.1007/s10008-012-1825-1

• Electrochemical impedance spectroscopy
• Multisinusoidal perturbation
• Electrochemical cells
• Fuel cell

A comprehensive description of impedance of electrochemical systems has been presented, along with the assumptions of the method used. In this method, a multisinusoidal current excitation signal is used. The changes of potential of both the electrodes and the potential difference between these electrodes are all registered simultaneously as a function of time. The proposed method offers the possibility of separately determining the instantaneous value of impedance of each electrode as well as the impedance of a two-electrode system. The short-time Fourier transform of time registers allow the determination of changes in the measured impedance values over time. The method has been successfully verified with an electrical equivalent circuit simulating a non-stationary two-electrode system. The values of the impedance of particular components during operation of the fuel cell under a changing load have been obtained.

• 出版日期2012-11