▎ 摘　　要

NOVELTY - The electrode has an electrode main body provided with an electrode substrate, a first boron-doped diamond film, a graphene layer and a second boron-doped diamond film from bottom to top. The first boron-doped diamond film and the second boron-doped diamond film are respectively formed with a first layer and a second layer. The first layer and the second layer are respectively formed with the first layer and the second layer. USE - Marine detector electrode with multi-layer film structure. ADVANTAGE - The graphene layer improves the conductivity of the electrode. The internal stress of the diamond film is reduced. The diamond layer electrochemical window is wide. The background current is low. The graphene layer has high carrier concentration and chemical stability. The sensitivity and stability of the ocean detector electrode is improved. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of ocean detector electrode with multi-layer film structure. DESCRIPTION OF DRAWING(S) - The drawing shows a front view of marine detector electrode with multi-layer film structure.