▎ 摘　　要

NOVELTY - Composite carbon electrode comprises a glassy carbon electrode and a catalyst-doped single-layer graphene deposited on the glassy carbon electrode. The thickness of the catalyst-doped single-layer graphene is 0.34-0.5 nm. USE - The composite carbon electrode is useful in electrochemical detection of small biological molecules (claimed). ADVANTAGE - The composite carbon electrode: uses catalyst-doped single-layer grapheme, which has a six-primary carbon ring honeycomb structure, thus the exposed surface area of the two-dimensional sheet-shaped single-layer graphene is large, the electron migration is fast, the active sites are more, the electro-catalytic activity is high and has excellent sensitivity; involves chemical vapor deposition method, which makes the electron mobility of the graphene structure closer to ideal graphene and the morphology of the graphene is controllable; improves the interface bonding force between glassy carbon electrode, catalyst-doped single-layer graphene and catalyst-doped multi-layer grapheme, thus has excellent electrical conductivity and electrocatalytic properties. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing composite carbon electrode, comprising preprocessing the glassy carbon electrode to obtain pre-treated glassy carbon electrode, loading catalyst precursor on the pre-treated glassy carbon electrode to obtain the catalyst precursor/glassy carbon electrode, orderly performing the first chemical vapor deposition and the second chemical vapor deposition on the catalyst precursor/glassy carbon electrode to obtain final product; and (2) use of composite carbon electrode in electrochemical detection of small biological molecules.