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 degradation 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.