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. 2024 Apr 29;16:184. doi: 10.1007/s40820-024-01410-8

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© The Author(s) 2024

Open Access This article is licenced 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. 2 — Verification of O_d in MVOH/rGO. a, b Atomic-resolution HAADF-STEM images and corresponding structural illustration. c EPR spectra of MVOH and MVOH/rGO. d–f High-resolution XPS spectra of O 1s at different etching depths. g–i High-resolution XPS spectra of V 2p at different etching depths