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Abstract
Electrochemical impedance spectroscopy (EIS) is frequently used to study electrochemical systems. However, despite all the benefits of this EIS method, it suffers from an important limitation related to the interpretation of the experimental data. Namely, the system under study must fulfill the conditions of causality, linearity and stationarity to correctly define its transfer function. Since it is clear that electrochemical processes can feature a nonstationary behaviour (e.g. corrosion studies) and since the occurrence of this behaviour is in contradiction with the necessary conditions to obtain reliable EIS results, an estimation of this behaviour is needed. Starting from Odd Random Phase multisine electrochemical impedance measurements (ORPEIS), a new procedure is setup in this work to quantify and correct for this timeevolution by means of the calculation of an instantaneous impedance. How this is done, will be elucidated in this study. After intuitively illustrating the method, the first article of this series will explain the mathematical background of the approach. Furthermore, the method will be demonstrated on a wellknown electrical equivalent circuit.
Original language  English 

Pages (fromto)  375382 
Number of pages  8 
Journal  Electrochimica Acta 
Volume  76 
Publication status  Published  1 Aug 2012 
Keywords
 Instantaneous impedance
 Nonstationary behaviour
 ORPEIS
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 1 Finished

DWTC282: Dynamical systems, control and optimization
Pintelon, R., Vandewalle, J., Aeyels, D., Sepulchre, R., Kinnaert, M., Vande Wouwer, A., Blondel, V., Winkin, J., Boyd, S. & Leonard, N.
1/04/12 → 30/09/17
Project: Fundamental