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. 2021 Jul 15;13:156. doi: 10.1007/s40820-021-00681-9

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© The Author(s) 2021

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. 2 — Strategies for catalytic activity enhancement. a Core–shell structures of g-C₃N₄@TiO₂ promote carrier separation. Reproduced with permission [121].

Copyright 2018, Elsevier. b K-doped g-C₃N₄ nanomaterials to achieve enhanced visible-light absorption, efficient carrier separation and strong oxidation capability. Reproduced with permission [136]. Copyright 2016, American Chemical Society. c Ni–Fe LDH nanocages with regulated tunable shells perform optimal chemical composition possessing large electroactive surface area. Reproduced with permission [155]. Copyright 2020, Wiley–VCH