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. 2021 Apr 15;12:2256. doi: 10.1038/s41467-021-22523-3

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© The Author(s) 2021

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. 2 — a STEM-HAADF image along the direction of [010] of Na_0.612K_0.056MnO₂. b Magnified images of the indicated squares in a. c EELS spectrum of the selected area in the inset image. d SIMS elemental profiles at different sputtering times. e Solid-state ³⁹K NMR spectra of Na_0.612K_0.056MnO₂ and K_0.67MnO₂.