3D graphene oxide-cobalt oxide polyhedrons for highly sensitive non-enzymatic electrochemical determination of hydrogen peroxide

Polyhedrons structured cobalt oxide (Co3O4 PHs) and three-dimensional graphene oxide encapsulated cobalt oxide polyhedrons (3D GO-Co3O4 PHs) were synthesized via facile hydrothermal synthetical route for the highly sensitive determination of hydrogen peroxide (H2O2). The morphological study clearly revealed the polyhedron shaped Co3O4 and additionally elemental, diffraction, and electrochemical studies were performed to verify the structure and shape. Owing to excellent synergy between Co3O4 PHs and GO, the composite possesses good porosity, large electrochemical area, roughened surface, and excellent electrocatalytic ability. The development of highly sensitive sensor is essential for H2O2 due to its great significance in physiological, biochemical, pharmaceutical and medicinal applications. A rapid, sensitive, selective, reproducible, and durable non-enzymatic H2O2 assay, by employing 3D GO-Co3O4 PHs modified electrode was described. The sensor offered excellent sensitivity with detection limit of 15 nM, which is superior to those of previously reported sensors. A real-time analysis was demonstrated in commercially acquired contact lens and disinfectant cleaning solutions without pre-treatment.