▎ 摘　　要

NOVELTY - A cobalt/graphene composite catalyst is prepared by (S1) adding graphite oxide to solvent (a), ultrasonically dispersing to form uniformly dispersed monolithic graphite oxide mixture, (S2) dissolving cobalt nitrate hexahydrate in solvent (b) to form uniform nitrate solution, (S3) adding nitrate solution to monolithic graphite oxide mixture, continuously stirring to form mixed solution (1) composed of graphite oxide with concentration of 1.25-1.7 mg/mL and nitrate solution with concentration of 3.6-5.0 mg/mL, (S4) dripping sodium hydroxide in mixed solution (1) to adjust pH of the solution to 11, continuously stirring to obtain mixed solution (2), (S5) adding sodium borohydride to mixed solution (2) and continuously stirring to obtain mixed solution (3), (S6) reacting mixed solution (3) at 80-180 degrees C for 2-5 hours, (S7) centrifuging, washing, drying and calcining at 450-800 degrees C for 2 hours to obtain final product. USE - Cobalt/graphene composite catalyst used for electrochemical reduction of carbon dioxide and reduction of hydrocarbon fuels. ADVANTAGE - The cobalt/graphene composite catalyst has high reducing power, high stability and current density of 16.2 mA/cm2. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: preparation of cobalt/graphene composite catalyst; and #application of cobalt/graphene composite catalyst, which involves pretreating the catalyst, placing in 0.1 M sodium bicarbonate electrolyte, introducing nitrogen gas into the electrolyte for 15 minutes and passing carbon dioxide for 15 minutes.