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, Yu Zhang

Nature communications 2024 Jul 13

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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. © 2024. The Author(s).

Citation

Kaizheng Feng, Zhenzhen Wang, Shi Wang, Guancheng Wang, Haijiao Dong, Hongliang He, Haoan Wu, Ming Ma, Xingfa Gao, Yu Zhang. Elucidating the catalytic mechanism of Prussian blue nanozymes with self-increasing catalytic activity. Nature communications. 2024 Jul 13;15(1):5908