Co3V2O8 nanoparticle-assembled porous sphere as a new electrocatalyst for sensitive nonenzymatic sensing of H2O2

The development of new highly active electrocatalysts is one of the key factors to improve the performance of enzyme-free electrochemical sensors . In this paper, Co 3 V 2 O 8 was proposed as a new electrocatalyst for nonenzymatic oxidation of H 2 O 2 . A facile self-templating strategy was adopted for the synthesis of Co 3 V 2 O 8 nanomaterial which was further characterized by transmission electron microscopy (TEM), powder X-ray diffractometry (XRD), fourier translation infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and electrochemical techniques . The results showed that porous Co 3 V 2 O 8 sphere was constructed from interconnected nanoparticle with a three-dimensional porous structure. Such unique structure made the sensor based on Co 3 V 2 O 8 exhibit good electrocatalytic activity toward H 2 O 2 oxidation, and could detect H 2 O 2 with a low detection limit of 0.34 µM, a wide linear range of 2.0 µM to 6.1 mM and a high sensitivity of 541.4 µA mM −1 cm −2 . This work demonstrated an effective new sensing platform for nonenzymatic detection of H 2 O 2 .