Influence of Probe Size and Probe Position for Local Electrochemical Impedance Spectroscopy
First, a non-negligible capacitance is observed in the high-frequency domains corresponding to a coupling capacitance between two of the micro-wires, as shown in Fig. 1.
Second, the position of the reference electrode for measuring the potential and calculating the local impedance plays a significant role . Indeed, depending on the location of the probe for measuring the potential, the measurement may be insensitive to local heterogeneity. As a result, such a measurement is no longer a local impedance measurement since it is obtained as a ratio of global potential to local current density.
In this paper, we present experimental results on platinum electrode and on the steel / copper system in order to characterize the influence of the probe size and the probe positioning. A specific attention will be paid to data analysis, and some guidelines for performing LEIS measurements (probe characterisation and probe positioning) will be presented.
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