▎ 摘　　要

Surface coating of graphene nano platelets with gold-palladium nanoparticles (AuPd NPs) was conducted via potentiostatic electrodeposition from a mixture of HAuCl4 and H2PdCl4. AuPd NPs were characterized using SEM, TEM, XRD and energy dispersive X-ray spectroscopy. The AuPd NPs with the diameter of about 30-60nm were alloyed and well-dispersed on the graphene surface. Electrochemistry of hydrazine on AuPd NPs was investigated using cyclic voltammetry and chronoamperometry, indicating high electrocatalytic ability of AuPd NPs towards oxidation of hydrazine. Under the optimized conditions, the oxidation current was linear to the hydrazine concentration in the range of 0.02-166.6 mu M. The calculated detection limit was 5nM (S/N=3).