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. 2014 May 28;14(6):9505–9521. doi: 10.3390/s140609505

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 7. — (a) Impedance spectra and (b) CVs recorded on a WE before and after each cleaning step. Each step reduces the charge transfer resistance and improves the cathodic and anodic peak of the CVs.