Improved experimental setup to reach a broad frequency domain in local electrochemical impedance spectroscopy measurements

[Display omitted] •A new LEIS setup is presented for performing low frequency measurements.•The development of local probes by soft lithography for sensing local current density allows broad-frequency measurements.•A comprehensive understanding of the local current densities is provided with the hel...

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Bibliographic Details
Published in:Measurement : journal of the International Measurement Confederation 2022-08, Vol.200 (200), p.111504, Article 111504
Main Authors: Pereira Gomes, Maurilio, Michelle Gateman, Samantha, Costa, Isolda, Gharbi, Oumaïma, Ngo, Kieu, Luiz Rossi, Jesualdo, Turmine, Mireille, Vivier, Vincent
Format: Article
Language:English
Subjects:
Chemical Sciences
Electrochemical impedance spectroscopy
Electrochemical instrumentation
Low frequency measurements
Material chemistry
Micro-electrochemistry
Scanning electrochemical probe microscopy
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Summary:[Display omitted] •A new LEIS setup is presented for performing low frequency measurements.•The development of local probes by soft lithography for sensing local current density allows broad-frequency measurements.•A comprehensive understanding of the local current densities is provided with the help of a newly developed equipment. We report a new experimental setup enabling local electrochemical impedance spectroscopy (LEIS) measurements over a wide frequency range, including the low frequency domain. First, an improved signal treatment was performed using a potential shifter to minimize the DC component of the measured potential, allowing for the local AC potential to be probed using an ideal electrochemical system. Then, a unique, three-electrode LEIS probe was implemented to study the influence of radial and lateral contributions on the LEIS response. The radial LEIS response is highest when the LEIS probe is positioned in the middle of the gold electrode substrate, whereas the lateral LEIS response is similar in both measured regions. Both experimental modifications were implemented to study the LEIS response over a corroding aluminum substrate, for which reliable results are obtained in the low frequencies. These tools could be used in future LEIS studies in other fields that require time-sensitive measurements.
ISSN:0263-2241
1873-412X
DOI:10.1016/j.measurement.2022.111504