▎ 摘　　要

NOVELTY - Method for one-step synthesis of cobalt tetraoxide nanowire/graphene airgel composite material comprises mixing graphene oxide with cobalt (II) nitrate hexahydrate solution, adjusting the pH value by alkaline solution, self-assembling graphene oxide into graphene hydrogel by hydrothermal method, at the same time, oxidizing a part of cobalt (II) ion to cobalt (III) ion, precipitating cobalt (II) ion to cobalt (III) ion in alkaline solution to form cobalt tetraoxide nanowires, performing in situ preparation of cobalt tetraoxide nanowires on graphene aerogels after freeze-drying, and obtaining cobalt tetraoxide nanowire/graphene airgel composite material. USE - Method for one-step synthesis of cobalt tetraoxide nanowire/graphene airgel composite material, which is used as an electrochemical sensor electrode modification materials in the detection of heavy metal ions (claimed). ADVANTAGE - The composite material: has strong enrichment function to the heavy metal ion; exhibits excellent electrochemical sensing performance in the heavy metal ion detection.