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. 2022 Sep 12;13:5365. doi: 10.1038/s41467-022-33098-y

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Fig. 3 — 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.