▎ 摘　　要

NOVELTY - Preparing nitrogen-doped three-dimensional porous graphene-based electrode material comprises (1) ultrasonically mixing graphene oxide solution and hydrogen peroxide solution, placing it in reaction kettle for reaction, washing and drying to obtain three-dimensional porous graphene oxide; (2) dissolving the three-dimensional porous graphene oxide obtained in step (1) in ultrapure water, mixing it with urea, carrying ultrasonic treatment, placing it in reaction kettle for hydrothermal reaction, washing and drying, obtaining nitrogen-doped three-dimensional porous graphene; the temperature of the hydrothermal reaction is 170-195 degrees C, and the time is 10-14 hours; and (3) preparing the nitrogen-doped three-dimensional porous graphene obtained in step (2) into dispersion, dropwise adding it to the center of glassy carbon electrode substrate, and vacuum drying at 15-30 degrees C to obtain nitrogen-doped three-dimensional porous graphene-based electrode material. USE - The electrode material is used in electrochemical sensors for detecting content of the organophosphorus pesticide methyl parathion. ADVANTAGE - The electrode material: has high sensitivity, short response time, strong anti-interference ability, good repeatability, good long-term stability and high recovery rate. DETAILED DESCRIPTION - Preparing nitrogen-doped three-dimensional porous graphene-based electrode material comprises (1) ultrasonically mixing graphene oxide solution and hydrogen peroxide solution, placing it in reaction kettle for reaction, washing and drying to obtain three-dimensional porous graphene oxide; (2) dissolving the three-dimensional porous graphene oxide obtained in step (1) in ultrapure water, mixing it with urea, carrying ultrasonic treatment, placing it in reaction kettle for hydrothermal reaction, washing and drying, obtaining nitrogen-doped three-dimensional porous graphene; the mass concentration of the three-dimensional porous graphite oxide is 1-3 mg/ml, and mass ratio of urea to the three-dimensional porous graphite oxide is 60:1-30:1; the temperature of the hydrothermal reaction is 170-195 degrees C, and the time is 10-14 hours; and (3) preparing the nitrogen-doped three-dimensional porous graphene obtained in step (2) into dispersion, dropwise adding it to the center of glassy carbon electrode substrate, and vacuum drying at 15-30 degrees C to obtain nitrogen-doped three-dimensional porous graphene-based electrode material. An INDEPENDENT CLAIM is also included for the nitrogen-doped three-dimensional porous graphene-based electrode material is prepared by above mentioned method.