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Depletable peroxidase-like activity of Fe3O4 nanozymes accompanied with separate migration of electrons and iron ions

Author

Listed:
  • Haijiao Dong

    (Southeast University
    Southeast University)

  • Wei Du

    (Southeast University
    Southeast University)

  • Jian Dong

    (Southeast University)

  • Renchao Che

    (Fudan University
    Fudan University
    Fudan University)

  • Fei Kong

    (Southeast University
    Southeast University)

  • Wenlong Cheng

    (Monash University
    The Melbourne Centre for Nanofabrication)

  • Ming Ma

    (Southeast University
    Southeast University)

  • Ning Gu

    (Southeast University
    Southeast University)

  • Yu Zhang

    (Southeast University
    Southeast University)

Abstract

As pioneering Fe3O4 nanozymes, their explicit peroxidase (POD)-like catalytic mechanism remains elusive. Although many studies have proposed surface Fe2+-induced Fenton-like reactions accounting for their POD-like activity, few have focused on the internal atomic changes and their contribution to the catalytic reaction. Here we report that Fe2+ within Fe3O4 can transfer electrons to the surface via the Fe2+-O-Fe3+ chain, regenerating the surface Fe2+ and enabling a sustained POD-like catalytic reaction. This process usually occurs with the outward migration of excess oxidized Fe3+ from the lattice, which is a rate-limiting step. After prolonged catalysis, Fe3O4 nanozymes suffer the phase transformation to γ-Fe2O3 with depletable POD-like activity. This self-depleting characteristic of nanozymes with internal atoms involved in electron transfer and ion migration is well validated on lithium iron phosphate nanoparticles. We reveal a neglected issue concerning the necessity of considering both surface and internal atoms when designing, modulating, and applying nanozymes.

Suggested Citation

  • Haijiao Dong & Wei Du & Jian Dong & Renchao Che & Fei Kong & Wenlong Cheng & Ming Ma & Ning Gu & Yu Zhang, 2022. "Depletable peroxidase-like activity of Fe3O4 nanozymes accompanied with separate migration of electrons and iron ions," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33098-y
    DOI: 10.1038/s41467-022-33098-y
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    References listed on IDEAS

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    1. Jinxing Chen & Qian Ma & Minghua Li & Daiyong Chao & Liang Huang & Weiwei Wu & Youxing Fang & Shaojun Dong, 2021. "Glucose-oxidase like catalytic mechanism of noble metal nanozymes," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
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