Hybridized Polyoxometalate-Based Metal–Organic Framework with Ketjenblack for the Nonenzymatic Detection of H2O2

Graphical Ketjen in the new black : NENU5-KB composite materials exhibited excellent electrochemical performance for the nonenzymatic detection of H 2 O 2 , including a broad linear range, low detection limit, and high sensitivity, as well as excellent selectivity and strong stability. The rational design and development of efficient and affordable enzyme-free electrocatalysts for electrochemical detection are of great significance for the large-scale applications of sensor materials, and have aroused increasing research interest. Herein, we report that a typical polyoxometalate (POM)-based metal–organic framework (NENU5) that was hybridized with ketjenblack (KB) was a highly efficient electrochemical catalyst that could be used for the highly sensitive nonenzymatic detection of H 2 O 2 . The composite catalyst exhibited superb electrochemical detection performance towards H 2 O 2 , including a broad linear range from 10–50 m m , a low detection limit of 1.03 μ m , and a high sensitivity of 33.77 μA m m −1 , as well as excellent selectivity and stability. These excellent electrocatalytic properties should be attributed to the unique redox activity of the POM, the high specific surface area of the metal–organic framework (MOF), the strong conductivity of KB, and the synergistic effects of the multiple components in the composites during the electrolysis of H 2 O 2 . This work provides a new pathway for the exploration of nonenzymatic electrochemical sensors.