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. 2020 May 4;11:2199. doi: 10.1038/s41467-020-16039-5

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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 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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Fig. 3 — a Energy level transition diagram of CaZn_3.6VO and O₂. b Optical image of the designed galvanic cell. c V 2p XPS spectra of the CaVO electrodes at different states and the CaZn_3.6VO electrodes after being oxidized by O₂ in 4 M Zn (CF₃SO₃)₂ solution for different times. d Comparison of XPS spectra of V 2p before and after oxidation. e XRD patterns and f calculational interlayer spacing of (002) plane of CaZn_3.6VO electrodes after being oxidized by O₂ for different times.