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. 2024 Nov 13;22:704. doi: 10.1186/s12951-024-02907-5

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, 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 you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. 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-nc-nd/4.0/.

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Fig. 16 — a Schematic diagram of the catalytic mechanism of the POD-like activity for Fe₃O₄ NPs. The catalytic POD-like reaction of Fe₃O₄ NPs occurs along with internal electron transfer and excess Fe ions migration. After prolonged catalysis, Fe₃O₄ NPs suffer the phase transformation to γ-Fe₂O₃ NPs with depletable POD-like activity [153]. b Mechanism of glucose oxidation catalyzed by GOX (left) and noble metal NPs (right), respectively [159]. c Proposed mechanism of CAT-like catalysis of ferrihydrite [161]