▎ 摘　　要

NOVELTY - Preparation of nano-copper/graphene composite-modified electrode involves (i) mixing medium and low-temperature coal tar pitch, butyl rubber, magnesium oxide and potassium hydroxide having an average particle size of 40-60 nm in a mass ratio of 3:1.5-3:12-20:3-6, preferably 3:2:18:6, adding the obtained mixture into an iron tank, placing the iron tank in a tube furnace, heating the tube furnace to 140-160 degrees C at a heating rate of 3-8 degrees C/minute under the protection of nitrogen, maintaining for 30-50 minutes, raising the temperature to 750-850 degrees C at a heating rate of 20-25 degrees C/minute, maintaining for 60-90 minutes, washing the obtained product with hydrochloric acid and distilled water and drying to obtain graphene, and (ii) ultrasonically dispersing the graphene in N,N-dimethylformamide, coating the obtained dispersion on the surface of a glassy carbon electrode to prepare a graphene-modified electrode and electrodepositing nano-copper on the surface of the graphene-modified electrode. USE - Preparation of nano-copper/graphene composite-modified electrode is used for detecting hydroquinone (all claimed). ADVANTAGE - The graphene obtained from the method has improved specific surface area and porous network structure, thereby effectively controlling the particle size of nano-copper deposited on the electrode surface and improving the electron transfer efficiency of the electrode.