A novel nonenzymatic hydrogen peroxide electrochemical sensor based on SnO₂-reduced graphene oxide nanocomposite

In this paper, we reported a nonenzymatic hydrogen peroxide amperometric sensor based on a glassy carbon electrode (GCE) modified with a SnO₂-reduced graphene oxide nanocomposite (SnO₂-RGO). The SnO₂-RGO nanocomposite was synthesized via a simple one-pot hydrothermal chemical method and characterized by scanning electron microscopy and X-ray diffraction. Cyclic voltammetry and amperometric techniques were employed to investigate its electrocatalytic performance towards the H₂O₂ oxidation. The combined advantages of RGO and SnO₂ provide the electrode with higher current response and lower oxidation potential compared with those of bare GCE and RGO modified GCE. The proposed electrode can be used for the determination of AA in the wide concentration range from 1 to 1000 μM with the detection limit of 0.11 μM. In addition, the proposed H₂O₂ electrochemical sensor also exhibits excellent reproducibility, stability and anti-interference property. We believe the SnO₂-RGO nanocomposite can be considered as a suitable electrode modifier candidate for electrochemical analytic applications.