▎ 摘　　要

The screening of high-performance material for real-time and sensitive analysis of hydrazine is of great importance in environmental pollutant monitoring. Herein, a nanocomposite of ZIF-8 and graphene oxide (ZIF-8-GO) has been prepared. Then the ZIF-8-GO was cast onto the glassy carbon electrode (GCE) by a physical dropping using chitosan as the film-forming agent. Followed by, the electrochemical reduction was performed to transfer the GO to the reduced form (ERGO) bearing higher electroconductivity. The ZIF-8-ERGO showed outstanding electrocatalysis toward hydrazine oxidation, arising from the synergy of the inherent electrocatalytic activity of ZIF-8 for hydrazine oxidation and excellent electro-conductivity of ERGO. Under the optimized conditions, the working curve for hydrazine analysis showed two linear regions, from 0.1 mu M to 0.26 mM and 0.26 mM to 1.16 mM respectively, and a low detection limit of 0.032 mu M was obtained. The theoretical calculation results revealed that the ZIF-8 had lower adsorption energy with hydrazine than uric acid and dopamine, enabling the sensor an excellent selectivity for hydrazine analysis. The recovery assay showed that the ZIF-8-ERGO-based sensor was applicable for hydrazine analysis in actual industrial wastewater, exhibiting great promising of the developed sensor in practical application.