Nonenzymatic hydrogen peroxide electrochemical sensor based on carbon-coated SnO2 supported Pt nanoparticles

We describe a simple method for preparing the hybrid material of Pt nanoparticles (NPs) supported on carbon-coated SnO 2 nanospheres (Pt–SnO 2 @C). The as-prepared Pt–SnO 2 @C nanocomposite was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The presence of carbon-coated SnO 2 nanospheres (SnO 2 @C) remarkably improves the electrocatalytic activity of Pt NPs towards hydrogen peroxide (H 2 O 2 ) oxidation. The Pt–SnO 2 @C nanocomposite modified glassy carbon (GC) electrode exhibited enhanced amperometric response to H 2 O 2 , with detection limit of 0.1   μM and sensitivity of 241.1   μA   mM −1   cm −2 .