Preperation And Characterization Of Several Noble Metal Nanocomposite And Their Electroanalytical Property Investigation

Due to the unique physical and chemical properties, noble metal nanocomposites have find applications in many fields, such as methanol fuel cell, modified electrode and drug analysis. In this essay, several noble metal nanocomposites were successfully synthesized and their morphology and crystalline structures were characterized and analyzed carefully. Additionally, their applications in methanol fuel cells and electrochemical analysis were also extensively studied. The main contents are as follows:1. Well-dispersed PtPdAu ternary alloy nanoparticles were synthesized on graphene sheets via a simple one-step chemical reduction method in ethylene glycol (EG) and water system, in which EG served as both reductive and dispersing agent. The electrocatalytic activity of PtPdAu/G was tested by methanol oxidation reaction (MOR). Electrocatalytic properties of the catalyst for MOR in alkaline have been investigated by cyclic voltammetry (CV), chronoamperometry and Tafel curves. The electrocatalytic activity and stability of PtPdAu/G were superior to PtPd/G, PtAu/G and Pt/G. This study implies that the prepared catalyst have great potential applications in fuel cells.2. A glassy carbon electrode modified with overoxidized dopamine film was prepared successfully by means of electropolymerization. Then highly dispersed silver particles were obtained via a pulsed electrodeposition technique on the overoxidized dopamine film (Ag/PDA/GC). The electrochemical behaviors of p-nitrophenol on Ag/PDA/GC were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The peak current was proportional to the concentration of p-nitrophenol in the range of4×10mol/L～2.8”10-4mol/L3An electrochemical sensor based on Fe3O4@C@Au nanocomposite was fabricated for sensitive detection of acetaminophen.The nanocomposite was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM).The electrochemical behaviors of acetaminophen on Fe3O4@C@Au modified glassy carbon electrodes (GCE) were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV).