▎ 摘　　要

A sensitive hydrazine sensor based on Ag-Ni/reduced graphene oxide (rGO) has been prepared via an electrodepositing method. The Ag-Ni/rGO composite was characterized by scanning electron microscopy (SEM), energy- dispersive X-ray spectroscopy analysis (EDS) and X-ray diffraction (XRD). The Ag-Ni/rGO composite had good electrocatalytic activity for hydrazine oxidation. The electrochemical behaviour of Ag-Ni/rGO for hydrazine oxidation was also explored. When the concentration of hydrazine changed from 1.0 mu M to 1.05 mM, the oxidation peak currents linearly increased. The detection limit was 0.3 mu M (S/N=3). The sensor based on Ag-Ni/rGO was also used to determine the hydrazine concentration in waste water and the results were satisfactory. The sensor based on Ag-Ni/rGO was easily fabricated and had a high stability, wide linear range, low cost and potential applications for real sample analysis.