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. 2017 Aug 10;7:7756. doi: 10.1038/s41598-017-07913-2

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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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Cyclic voltammetry (CV) at the rate of 20 mV/s in acetate buffer containing 1.0 M KCl and no O₂ for (a) different MnO_x at pH 6.0, and (b) γ-MnO₂ at different pH levels. The correlation between the reaction rate constants of the initial ABTS reactions and the onset potential of Mn(IV)/Mn(III) for (c) different MnO_x at pH 6.0, and (d) γ-MnO₂ at different pH levels.