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. 2020 Feb 18;12:56. doi: 10.1007/s40820-020-0397-3

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© The Author(s) 2020

Open AccessThis 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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Fig. 5 — High-resolution XPS spectra of a Zn 2p, b Mn 2p, and c O 1s at initial, fully discharged, and charged statuses. d XPS Na 1s spectra at different statuses of initial and after recharged to 1.9 V. e Cyclic voltammetry curves of the coin-type Zn/NMOH cell at 0.1 mV s⁻¹ using aqueous electrolytes of 2 M ZnSO₄ + 0.2 M MnSO₄ (red) and 1 M Na₂SO₄ (blue). (Color figure online)