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. 2021 Jul 19;21(14):4909. doi: 10.3390/s21144909

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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EIS spectra of the 1a type (blue rectangle), 1d type (red circle), and 1e type (green triangle) electrodes recorded in 0.1 M KCl solution under open circuit potential. Frequency range 500 kHz—0.01 Hz, amplitude 20 mV.

EIS spectra of the 1a type (blue rectangle), 1d type (red circle), and 1e type (green triangle) electrodes recorded in 0.1 M KCl solution under open circuit potential. Frequency range 500 kHz—0.01 Hz, amplitude 20 mV.