▎ 摘　　要

NOVELTY - The method for preparing catalyst involves (1) preparing graphene/template complex by chemical vapor deposition, (2) dispersing the complex in deionized water, adding a mixed solution of ferric nitrate and ammonium molybdate, stirring, dripping ammonia to obtain mixed solution, (3) filtering the mixed solution, drying at 300 degrees C and calcining at 700 degrees C to obtain catalyst. The molar ratio of ferric nitrate to ammonium molybdate is 1:(0.01-10). The concentration of aqueous ammonia is 25-30%. USE - Method for preparing catalyst such as nitrogen-doped or non-doped catalyst for preparation of carbon nanotube-graphene composite (all claimed). ADVANTAGE - The method utilizes two chemical vapor deposition processes to control the structural characteristics and nitrogen content of graphene and carbon nanotubes by changing the growth conditions of graphene and carbon nanotubes. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of carbon nanotube-graphene composite, which involves (1) carrying out growth of carbon nanotubes under the presence of catalyst by chemical vapor deposition, (2) cooling to room temperature in a nitrogen or argon atmosphere to obtain a powder product, (3) adding the powder product to dilute hydrochloric acid and stirring to obtain a mixed solution, (4) filtering the mixed solution and drying to obtain carbon nanotube-graphene composite. The dilute hydrochloric acid is obtained by mixing 37.5% concentrated hydrochloric acid with water in a mass ratio of 1:(1-5). The mass percentage of dilute hydrochloric acid is 10-15 %mass; and (2) carbon nanotube-graphene composite.