▎ 摘　　要

NOVELTY - Preparation of double-layer graphene, involves placing pulverized graphite in oxidizing solution, electrolyzing graphite mixed emulsion (I), and magnesium or magnesium alloy, zinc or zinc alloy as anode and lead plate as cathode, milling manganese and titanium single element into powder, adding water with weak acidity to obtain performance enhancing agent, adding graphite mixed emulsion (II), introducing emulsion (III) into catalytically active transition metal substrate surface, placing substrate graphene-containing transition metal under ultra-high vacuum conditions. USE - Method for preparing double-layer graphene (claimed). ADVANTAGE - The method enables preparation of double-layer graphene with high purity by oxidizing and removing the impurities in graphite through electrolysis, and excellent corrosion resistance and high toughness by adding manganese and titanium elements. DETAILED DESCRIPTION - Method for preparing double-layer graphene, involves (1) pulverizing graphite with purity over 70%, placing in strong oxidizing solution and stirring repeatedly for 10-20 minutes and obtaining graphite mixed emulsion (I) with large amount of chlorine ion, permanganate ion and sulfate ion, (2) using graphite mixed emulsion (I) as electrolyte, and using magnesium or magnesium alloy, zinc or zinc alloy as anode and lead plate as cathode, applying voltage at 220-380 V, electrolyzing the graphite mixed emulsion (I), so that chlorine ion, permanganate ion and sulfate ion are adsorbed on the semi-permeable membrane and sodium ion and aluminum ion on the cathode grid are adsorbed on the semi-permeable membrane, and forming graphite mixed emulsion (II), (3) milling manganese and titanium single element into powder with radius of 0.2-0.6 mm, adding 2-4 pts. wt. powder and 30-60 pts. wt. water with weak acidity for 10-20 minutes, obtaining performance enhancing agent, (4) adding graphite mixed emulsion (II) and 10 pts. wt. performance enhancing agent, heating at 50-80 degrees C, stirring for 10-20 minutes to obtain graphite mixed emulsion (III), (5) introducing 10-16 pts. wt. graphite mixed emulsion (III) into catalytically active transition metal substrate surface under ultra-high vacuum conditions, heating at 110-140 degrees C, leaving still for 0.5-1 hour, (6) placing the substrate graphene-containing transition metal under ultra-high vacuum conditions, introducing 3-6 pts. wt. graphite mixed emulsion (III) into catalytically active transition metal substrate surface, heating at 110-140 degrees C, leaving still for 0.5-1 hour, so that graphene is fully covered with substrate of the transition metal and forming complete layer of graphene film.