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. 2019 Mar 13;9(3):429. doi: 10.3390/nano9030429

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© 2019 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 (http://creativecommons.org/licenses/by/4.0/).

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Cyclic voltammograms (A) and Nyquist plots (B) of different electrodes in 1.0 mM K₃[Fe(CN)₆] solution containing 0.5 M KCl. Scan rate: 0.1 V s⁻¹. The frequency range was from 0.1 to 10⁵ Hz at the formal potential of 0.17 V. (a) CPE, (b) ABPE, (c) GR/ABPE.