▎ 摘　　要

NOVELTY - The electrode has an electrode main body provided with an electrode substrate and arranged on a surface of an electrode base nanometer composite layer. The electrode substrate nanometer composite layer is made of nitrogen-doped graphene-silver nano composite material. The nitrogen-doped graphene-silver nano composite material is selected from one of silver nitrate solution, graphene oxide solution, chloroauric acid solution and ammonium carbonate mixed reaction, where concentration of the silver nitrate solution is about 0.08-0.12mol per liter. USE - Electrode for use in a sensor i.e. electrochemical sensor (all claimed). ADVANTAGE - The electrode easy to operate and environment-friendly to use, and has high sensitivity and wider application range, so that electrochemical performance and catalysis performance of the electrode is improved. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for an electrode preparation method. DESCRIPTION OF DRAWING(S) - The drawing shows a graphical view illustrating an electrode.