Regulation of graphdiyne-based nanozymes with enhanced oxidase-like activity by cobalt and nitrogen codoping
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Abstract
The development of nanozymes with excellent intrinsic oxidase-like activity and specificity has received increasing interest. Graphdiyne (GDY) could be a promising choice for designing nanozymes with enhanced oxidase (OXD)-like activity due to its unique structure and properties. Herein, Co-N-GDY with high OXD activity but no peroxidase (POD) activity was synthesized by codoping of cobalt (Co) and nitrogen (N) into GDY and compared with other GDY-based nanozymes (including GDY, Co-GDY, and N-GDY). Upon analyzing the doping effect of Co and N on the OXD-like and POD-like activities, we found that the combination of Co and N in GDY played a significant role in enhancing the OXD-like activity, and even reversed the POD-like activity of N-GDY to OXD-like activity of Co-N-GDY. The electrochemical experiment and the theoretical calculations provided an explanation for the mechanism and showed that the activity was closely linked to the reduction ability of O2 or H2O2 on the nanozyme substrates, which was determined by the rate-determining step of the catalytic reaction.
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References
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