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 SnO2 nanospheres (Pt-SnO2@C). The as-prepared Pt-SnO2@C nanocomposite was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The presence of carbon-coated SnO2 nanospheres (SnO2@C) remarkably improves the electrocatalytic activity of PtNPs towards hydrogen peroxide (H2O2) oxidation. The Pt-SnO2@C nanocomposite modified glassy carbon (GC) electrode exhibited enhanced amperometric response to H2O2, with detection limit of 0.1 mu M and sensitivity of 241.1 mu A mM(-1) cm(-2). (C) 2012 Elsevier B.V. All rights reserved.