Simple non-enzymatic electrochemical sensor for hydrogen peroxide based on nafion/platinum nanoparticles/reduced graphene oxide nanocomposite modified glassy carbon electrode

Abstract

A facile and effective strategy to fabricate non-enzymatic H2O2 sensor was developed based on Nafion/Platinum nanoparticles/reduced graphene oxide (Nafion/Pt NPs/RGO) nanocomposite modified glassy carbon (GC) electrode. The morphology of Nafion/Pt NPs/RGO nanocomposite was characterized by transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX) analyzer, Fourier transform infrared spectrum (FT-IR), and X-ray diffraction (XRD) spectrum respectively. The electrochemical properties of the prepared H2O2 sensor were evaluated by cyclic voltammetry and chronoamperometry. The prepared H2O2 sensor exhibited excellent electroreduction activity toward H2O2 with a wide linear range of 0.005–3 mM, a remarkable sensitivity of 132.8 μA mM−1 cm−2, and a low detection limit of 0.4 μM (S/N = 3). In addition, it showed good selectivity, reproducibility, and long-term stability. The excellent performance of the sensor might be attributed to the synergic effect of nanohybrids. These favorable results indicated that the prepared Nafion/Pt NPs/RGO nanocomposite is promising for fabricating non-enzymatic H2O2 sensor.