Synergy between platinum and oxygen vacancy in CeO2 boosting enzyme-mimicking activity

Reducible metal-oxide based nanozymes have received much attention in recent years due to their excellent and tunable enzyme-mimicking properties. Herein, porous CeO2 nanorods supported Pt-based nanozymes with specific content of oxygen vacancy (Ov) were synthesized by combining atomic layer deposition and te following hydrogen activation strategy, among which the Pt/CeO2-650R nanozymes with average particle size of 1.6 nm exhibit the optimized peroxidase activity in the typical H2O2-TMB reaction systems, whose specific activity is 3-fold higher than that of Pt/CeO2 counterparts. Besides, the reduced nanozymes also present excellent degra-dation and antibiosis properties. The activity enhancement is ascribed to the Pt-Ov synergy contributing to the stronger capability to generate active radical species. This work affords new insights for in-depth understanding metal-Ov synergy in nanozyme catalysis field.