Electrocatalytic Reduction of H_2O_2 on Thiolate Graphene Oxide Covalently to Bonded Palladium Nanoparticles

摘要

The electrocatalytic reduction of hydrogen peroxide on thioalted graphene oxide (t-GO) covalent bonded to palladium nanoparticles was used as the basis of an H_2O_2 biosensor. Poly(diallydimethylammonium chloride)-coated t-GO-Pd on glassy carbon electrodes was easily and quickly prepared and gave sensitive measurements of H_2O_2 concentration. The Pd nanoparticles covalently bonded to the thiolated graphene oxide were characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, and energy dispersive X-ray spectroscopy. Comparable results for H_2O_2 determination were obtained from cyclic voltammetric and amperometric measurements. The proposed H_2O_2 biosensor exhibited a wide linear range of 10 μM to 10 mM, and a low detection limit of 0.22 μM (S/N = 3), at an applied potential of -0.1 V by the amperometric method.