Morphology-controlled synthesis of Ag nanoparticle decorated glassy carbon electrode and its electrochemical performance

Without using any template or surfactant, glassy carbon (GC) electrodes modified with Ag nanomaterial were fabricated by electrodeposition from an aqueous solution of AgNO3. X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were employed to characterize the morphology and substance composition of the as-prepared Ag nanomaterials. In addition, the electrochemical properties of the modified electrode including its electrocatalytic activity toward hydrogen peroxide (H2O2) were investigated by cyclic voltammetry. Results demonstrated that the Ag nanoparticles could be morphology-controllable synthesized by adjusting the concentration of AgNO3, and the electrochemical activities of the modified electrode enhanced with the concentration of AgNO3. The as-prepared Ag dendrites coated GC electrodes exhibited favorable electrocatalytic activity toward reduction of H2O2. The sensing of H2O2 was carried out with amperometry, where from the limit of detection and linear calibration range is deduced as 0.5 mu M and 0.005-12 mM, respectively, and it showed good anti-interferant ability.