摘要
The widespread use of carbendazim (CBZ) fungicide calls for monitoring its toxic residues in food due to human health concerns. Herein, a Ru/CeO 2-x heterostructured composite was constructed by sodium borohydride reduction for the electrochemical sensing of CBZ. The rational design engineers abundant interfacial oxygen vacancies and Ru nanoclusters, which form interfacial Lewis acid-base pairs capable of dual-site recognition of CBZ molecules. Specifically, oxygen-vacancy Lewis acidic sites preferentially adsorb the electron-rich groups(such as lone pairs on amino groups), while Ru-based Lewis basic sites capture electron-deficient carbon atoms within the benzimidazole ring. Such synergistic adsorption and interfacial charge transfer markedly enhance the redox kinetics of CBZ. Consequently, the Ru/CeO 2-x /GCE sensor delivers an ultralow detection limit of 7.7 nM, along with excellent selectivity, reproducibility, and long-term stability. This work provides a new interfacial engineering strategy integrating oxygen-defect chemistry and electronic modulation for designing high-performance Lewis acid–base coupled sensing materials.
危险品化学品经营许可证（带存储）