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. 2020 Sep 21;10:15370. doi: 10.1038/s41598-020-72392-x

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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CV curves of GO, rGO-C, N-PCM, PPy, PPy/GO, PPy/rGO-C and PPy/N-PCM at a scan rate of 20 mV s⁻¹ (a), GCD curves of GO, rGO-C, N-PCM, PPy, PPy/GO, PPy/rGO-C and PPy/N-PCM at the current density of 1 A g⁻¹ (b); CV curves of PPy/N-PCM with different concentration at a scan rate of 20 mV s⁻¹ (c); GCD curves of PPy/N-PCM with different concentration at the current density of 1 A g⁻¹ (d); CV curves of PPy/N-PCM at different scan rates (e); and GCD curves of PPy/N-PCM at different current density (f).