Ag-Au nanoparticles, polymer film, ammonia borane, fuel cell
In this study, poly (p-aminophenol) film glassy carbon electrode (PPAP/GCE) was prepared by electrochemical polymerization and then Au-Ag nanoparticles created by electrochemical reduction from their solutions on the PPAP/GCE surface by cyclic voltammetry. The surface morphology and chemistry were characterized by atomic force microscopy (AFM), scanning electron microscopy, electrochemical impedance spectroscopy, and cyclic voltammetry and Energy dispersive X-ray spectroscopy, techniques. Au and Ag nanoparticles on PPAP/GCE were confirmed with EDX spectrum. The electrochemical behavior of 1.0 mM AB was studied in 2.0 M NaOH at various electrodes. There was no any oxidation reaction occurs on bare GCE and PPAP/GCE in the presence of AB. AB was oxidized on Au disk electrode, Ag, Au and Au-Ag/PAP/GC electrodes at negative potentials. Among the five electrodes Au-Ag/PPAP/GC electrode has the highest peak current and shifting the oxidation potential to more negative values and thus represents the highest electrocatalytic activity of Au-Ag/PPAP/GC as electrocatalyst for AB electrooxidation. It can be attributed to the synergistic effect of Au-Ag bimetallic particles, which additionally improves the electrooxidation of AB.