Quench-induced the formation of enriched oxygen vacancies on the surface of Co3O4 for boosting electrochemical sensing of glucose

This study regulates the electrocatalytic activity of Co 3 O 4 nanomaterials based on quench-induced oxygen vacancies for boosting electrochemical sensing of glucose. Two different types of Co 3 O 4 nanomaterials were synthesized by the hydrothermal method and high-temperature calcination. It was found that quenching induced abundant oxygen vacancy defects on the surface of Co 3 O 4 nanomaterial. The presence of oxygen vacancy defects not only improves the conductivity of Co 3 O 4 nanomaterials, but also enhances the adsorption of OH - and facilitates the creation of abundant active sites. The enriched oxygen vacancies boost the electrocatalytic activity of Co 3 O 4 nanomaterials, enabling the sensor to detect glucose with an extremely high sensitivity of 1528.1 µA·mM −1 ·cm −2 . Furthermore, the sensor can be utilized for detecting glucose in energy drinks. This study explores the structure-activity relationship between oxygen vacancies and electrocatalytic activity, providing insights for the development of high-performance sensing materials through the oxygen vacancy regulation strategy.