▎ 摘　　要

One-pot electrodeposited copper-graphene (Cu-GE) nanocomposite acting as sacrificial template for the division electrosynthesis of palladium nanoparticles (PdNPs) on pyrolytic graphite electrode (PGE) was synthesized. The designed PdNPs-GE nanocomposite was evaluated as a new material for highly sensitive determination of hydrazine (N2H4). Scanning electron microscopy revealed that the PdNP-GE-modified PGE had uniform morphology. The results of energydispersive X-ray spectrograms confirmed the ingredients of the division electrosynthesis process. Electrochemical experiments were performed to characterize the sensing properties of PdNPs-GE toward the electrocatalytic oxidation of N2H4 at 0.20 V in sodium phosphate buffered saline (0.1 M pH 7.0). The sensor showed fast response (<3 s), high sensitivity [398 (1 x 10(-6) A) (1 x 10(-3) M)(-1)], and broad linearity in the range 2.5 x 10(-8) 2.7 x 10(-4) M with a relatively low detection limit of 1.0 x 10(-8) M (S/N = 3).