title: Synthesis of three-dimensional reduced graphene oxide layer supported cobalt nanocrystals and their high catalytic activity in F-T CO2 hydrogenation.
abstract: The reduced graphene oxide (rGO) supported cobalt nanocrystals have been synthesized through an in situ crystal growth method using Co(acac)2 under solvothermal conditions by using DMF as the solvent. By carefully controlling the reaction temperature, the phase transition of the cobalt nanocrystals from the cubic phase to the hexagonal phase has been achieved. Moreover, the microscopic structure and morphology as well as the reduction process of the composite have been investigated in detail. It is found that oxygen-containing functional groups on the graphene oxide (GO) can greatly influence the formation process of the Co nanocrystals by binding the Co(2+) cations dissociated from the Co(acac)2 in the initial reaction solution at 220 °C, leading to the 3D reticular structure of the composite. Furthermore, this is the first attempt to use a Co/rGO composite as the catalyst in the F-T CO2 hydrogenation process. The catalysis testing results reveal that the as-synthesized 3D structured composite exhibits ideal catalytic activity and good stability, which may greatly extend the scope of applications for this kind of graphene-based metal hybrid material.
authors.affiliation: Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, PR China.
authors.forename: Fei
authors.initials: F
authors.lastname: He
authors.forename: Na
authors.initials: N
authors.lastname: Niu
authors.forename: Fengyu
authors.initials: F
authors.lastname: Qu
authors.forename: Shuquan
authors.initials: S
authors.lastname: Wei
authors.forename: Yujin
authors.initials: Y
authors.lastname: Chen
authors.forename: Shili
authors.initials: S
authors.lastname: Gai
authors.forename: Peng
authors.initials: P
authors.lastname: Gao
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Piaoping
authors.initials: P
authors.lastname: Yang
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006865:Hydrogenation; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D010087:Oxides / Q000138:chemical synthesis / Q000737:chemistry
chemical_list: D010087:Oxides; D002245:Carbon Dioxide; D003035:Cobalt; D006108:Graphite