▎ 摘　　要

NOVELTY - A laser-induced graphene-cobalt electrode comprises a flexible base film, a graphene film formed on surface of base film by a laser cutting process, a cobalt coating, a reference electrode and a counter electrode respectively connected with wires through conductive gel to form a three-electrode system structure. The cobalt coating is electrodeposited on the surface of the graphene film in a constant current mode by using an acidic electroplating solution to form a working electrode sensitive to phosphate ions, working electrode is soaked in deionized water to obtain a stable potential and then working electrode is soaked in water source to be detected. USE - Laser-induced graphene-cobalt electrode for detection of phosphate ion in eutrophic water and removal of nutrient salt in water. ADVANTAGE - The laser-induced graphene-cobalt electrode has excellent electrical and mechanical property, unique two-dimensional layered structure, and large specific surface area, and is combined with the cobalt plating layer and provides more active sites and ion channels to improve the response speed of the electrode to phosphate ions, thereby improving the detection performance. The electrode is needs to be coated with a small usage amount of active cobalt film on the surface layer, so the cost of the electrode can be effectively reduced, and the electrode structure can be randomly arranged, and is easy for real-time monitoring and accurately recording phosphate ion concentration in water. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the laser-induced graphene-cobalt electrode.