Elucidating the catalytic mechanism of Prussian blue nanozymes with self-increasing catalytic activity

Kaizheng Feng, Zhenzhen Wang, Shi Wang, Guancheng Wang, Haijiao Dong, Hongliang He, Haoan Wu, Ming Ma (), Xingfa Gao () and Yu Zhang ()
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Kaizheng Feng: Southeast University
Zhenzhen Wang: National Center for Nanoscience and Technology of China
Shi Wang: Southeast University
Guancheng Wang: Southeast University
Haijiao Dong: Nanjing Institute of Measurement and Testing Technology
Hongliang He: Southeast University
Haoan Wu: Southeast University
Ming Ma: Southeast University
Xingfa Gao: National Center for Nanoscience and Technology of China
Yu Zhang: Southeast University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Although Prussian blue nanozymes (PBNZ) are widely applied in various fields, their catalytic mechanisms remain elusive. Here, we investigate the long-term catalytic performance of PBNZ as peroxidase (POD) and catalase (CAT) mimetics to elucidate their lifespan and underlying mechanisms. Unlike our previously reported Fe3O4 nanozymes, which exhibit depletable POD-like activity, the POD and CAT-like activities of PBNZ not only persist but slightly enhance over prolonged catalysis. We demonstrate that the irreversible oxidation of PBNZ significantly promotes catalysis, leading to self-increasing catalytic activities. The catalytic process of the pre-oxidized PBNZ can be initiated through either the conduction band pathway or the valence band pathway. In summary, we reveal that PBNZ follows a dual-path electron transfer mechanism during the POD and CAT-like catalysis, offering the advantage of a long service life.

Date: 2024
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DOI: 10.1038/s41467-024-50344-7

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