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In the present work, one-step electrochemical method was utilized to synthesize reduced graphene oxide-silver nanoparticles (RGO-AgNPs) composites modified electrode. By modulating the electrodeposition potential, uniform and highly dispersed AgNPs were deposited onto RGO surface, the morphology of which was characterized by scanning electron microscopy (SEM). Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) were used to investigate the electrochemical properties of this RGO-AgNPs modified electrode. When the resultant RGO-AgNPs composites were employed in fabricating a nonenzymatic H2O2 sensor, good electrocatalytic activity characterized with low over-potential and large current response was found for H2O2 reduction. The proposed sensor also exhibited excellent analytical parameters for amperometric detection of H2O2, such as rapid response time, wide linear range, high sensitivity and selectivity, low detection limit, acceptable reproducibility and stability. This work shows prospects for fabricating high-performance electrochemical sensors.

One-step Electrochemically Modulated Synthesis of Reduced Graphene Oxide-Silver Nanocomposites as Efficient Nonenzymatic H2O2 Sensor