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. 2021 Jul 7;12:4182. doi: 10.1038/s41467-021-24529-3

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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 Schematic illustration of the synthetic strategy of NiCo@C/MXene/CF. b SEM image showing macroporous scaffold of this electrode. Scale bar, 200 μm. c SEM image of mesoporous networks of NiCo@C nanosheets on electrode surface. Scale bar, 3 μm. d TEM image of a NiCo@C nanosheet. Scale bar, 100 nm. e HRTEM image of NiCo nanocrystallite on the nanosheet. Scale bar, 3 nm. f Elemental mapping showing the uniform distribution of C, N, Ti, Ni, and Co elements in this electrode. Scale bar, 5 μm.