A NEW APPROACH TO THE PROBLEM OF GOOD AND BAD IMPEDANCE DATA IN ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY

Time resolved impedance spectra measurements were performed on potenti al-stepped Ag electrodes using a FFT impedance spectrometer which oper ates with a sum of properly defined sine waves as a perturbation. New frequencies were observed in the current response spectra in cases whe n current relaxation had not decayed before the perturbation was appli ed. The analysis of the amplitude spectra of the response current allo ws one to determine whether the obtained impedance spectra were ''good '' or ''bad''. Possibilities are outlined for the correction of the me asured current data in order to obtain valid impedance spectra.