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. 2017 Aug 15;7:8260. doi: 10.1038/s41598-017-09039-x

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© The Author(s) 2017

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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Electrochemical characterization of MnO₂ electrodes at various numbers of electrodepoistion cycles and scan rates. (a) Plots of the areal capacitance as a function of the number of MnO₂ electrodeposition cycles and (b) bar graphs of the specific capacitances after 10 and 60 electrodeposition cycles. The scan rate was 100 mV s⁻¹ for these measurements. (c) Plots of specific capacitance retentions as a function of the scan rate and (d) Nyquist plots for the planar and nanostructured electrodes. The number of MnO₂ electrodeposition cycles was 60 for these measurements.