▎ 摘　　要

The fabrication and application of bimetallic catalysts are of significance in enhanced electrocatalytic performance. In this work, sea urchin-like Pt-Cu bimetallic catalyst was synthesized by a one-pot aqueous method. The alloy was reduced and grown directly on the surface of reduced graphene oxide (RGO), which can maximize the contact/interaction between metals and RGO to achieve the enhanced catalytic activity. The transmission electron microscopy images revealed that the Pt-Cu bimetallic particles were uniformly dispersed on RGO in the shape of sea urchin-like with the size about similar to 20 nm. A hydrazine electrochemical sensor was built by modifying glassy carbon electrode with Pt-Cu/RGO nanomaterial. The electrochemical experiments showed that the proposed sensor exhibited an excellent performance for hydrazine analysis with a wide linear range of 0.4 mu M-12 mM and a low detection limit of 0.13 mu M (S/N = 3). Additionally, the sensor also demonstrated a long term stability, good selectivity and repeatability.