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Abstract
Regenerable nanozymes with high catalytic stability and sustainability are promising substitutes for naturally-occurring enzymes but are limited by insufficient and non-selective catalytic activities. Herein, we developed single-atom nanozymes of RhN
4
, VN
4
, and Fe-Cu-N
6
with catalytic activities surpassing natural enzymes. Notably, Rh/VN
4
preferably forms an Rh/V-O-N
4
active center to decrease reaction energy barriers and mediates a “two-sided oxygen-linked” reaction path, showing 4 and 5-fold higher affinities in peroxidase-like activity than the FeN
4
and natural horseradish peroxidase. Furthermore, RhN
4
presents a 20-fold improved affinity in the catalase-like activity compared to the natural catalase; Fe-Cu-N
6
displays selectivity towards the superoxide dismutase-like activity; VN
4
favors a 7-fold higher glutathione peroxidase-like activity than the natural glutathione peroxidase. Bioactive sutures with Rh/VN
4
show recyclable catalytic features without apparent decay in 1 month and accelerate the scalp healing from brain trauma by promoting the vascular endothelial growth factor, regulating the immune cells like macrophages, and diminishing inflammation.