▎ 摘　　要

NOVELTY - A thin film electrode comprises substrate and surface composite powder film. The surface composite powder film is uniformly doped with active elements and carbon-based material fine powder. The active elements comprise noble metal particles, %mass organic diboron compounds, and rhenium particles. The surface composite powder film comprise 0.1-3.0 %mass noble metal particles, 0.1-15 %mass organic diboron compounds, 0.1-10 %mass rhenium particles, and balance carbon-based material fine powder. The substrate is an inert metal plate. USE - Thin film electrode. ADVANTAGE - The thin film electrode ensures the degradation effect of toxic and refractory organics due to the addition of noble metal elements, enhances the removal effect of mercury and other heavy metal sewage, and has improved electrocatalytic performance of the doped carbon-based film electrode. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of the composite powder, which involves (A) pre-treating the carbon-based material fine powder with an average particle size of 5 nm-500 mu m in a mixed solution of concentrated sulfuric acid and concentrated nitric acid, feeding air to disperse the carbon-based material powder by micro-nano bubble aeration, in which the surface of the carbon-based material powder is negatively charged oxygen-containing functional groups, hydroxyl functional groups and carboxyl functional groups, (B) putting the processed particles into a polar solvent to form negatively charged carbon-based material particles, ultrasonically-dispersing and suspending the negatively charged carbon-based material particles in the polar solvent to form a suspension, (C) adding positively charged 0.1-0.5 mol/L noble metal ion aqueous solution and perrhenic acid aqueous solution to the suspension neutralizing the charge of the noble metal ion by adding a neutralizing agent, converting the noble metal ions around the surface of the carbon-based material particles into hydroxides or hydrated oxides, converting the perrhenic acid into perrhenate, precipitating on the carbon-based material particles, loading with noble metal precursors and perrhenates, (D) adding a diboron compound as a reducing agent to the suspension to form a composite suspension, filtering with suction, cooling, drying to obtain a composite coarse powder, (E) heating the composite coarse powder in a weakly reducing atmosphere at a temperature of 200-500 degrees C, heating at a constant temperature for 1-3 hours, cooling naturally to reduce the carried noble metal precursors to precious metals, and converting the perrhenate into rhenium metal; and (2) preparation of the thin film electrode.