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. 2018 Feb 27;8:3721. doi: 10.1038/s41598-018-22066-6

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Characterization of electrochemical and electrical properties of the electrodes. (a) Bode plots and (b) Impedances at 0.1, 1, and 10³ Hz of various electrodes. Ten PPy electrodes were autoclaved. Among them, five electrodes showing the lowest impedances were selected and noted as ‘Autoclave a’ and all the 10 autoclaved electrodes were noted as ‘Autoclave b’ in the plots. (c) Cyclic voltammograms of the electrodes in a presence of 5 mM [Fe(CN)₆]^3−/4− in 0.1 M KCl solution at a 0.1 V/s scan rate. (d) Conductivity of PPy and γ-PPy. (e) UV/vis spectra of PPy and γ-PPy electrodes.