title: Enabling Colloidal Synthesis of Edge-Oriented MoS2with Expanded Interlayer Spacing for Enhanced HER Catalysis.
abstract: By selectively promoting heterogeneous nucleation/growth of MoS2on graphene monolayer sheets, edge-oriented (EO) MoS2nanosheets with expanded interlayer spacing (∼9.4 Å) supported on reduced graphene oxide (rGO) sheets were successfully synthesized through colloidal chemistry, showing the promise in low-cost and large-scale production. The number and edge length of MoS2nanosheets per area of graphene sheets were tuned by controlling the reaction time in the microwave-assisted solvothermal reduction of ammonium tetrathiomolybdate [(NH4)2MoS4] in dimethylformamide. The edge-oriented and interlayer-expanded (EO&IE) MoS2/rGO exhibited significantly improved catalytic activity toward hydrogen evolution reaction (HER) in terms of larger current density, lower Tafel slope, and lower charge transfer resistance compared to the corresponding interlayer-expanded MoS2sheets without edge-oriented geometry, highlighting the importance of synergistic effect between edge-oriented geometry and interlayer expansion on determining HER activity of MoS2nanosheets. Quantitative analysis clearly shows the linear dependence of current density on the edge length of MoS2nanosheets.
authors.affiliation: Department of Chemistry, Temple University , 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States.
authors.forename: Yugang
authors.identifier: 0000-0001-6351-6977
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Department of Chemistry, Temple University , 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States.
authors.forename: Farbod
authors.initials: F
authors.lastname: Alimohammadi
authors.affiliation: Department of Chemistry, Temple University , 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States.|Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, Beijing University of Technology , Beijing, 100124, People's Republic of China.
authors.forename: Dongtang
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, Beijing University of Technology , Beijing, 100124, People's Republic of China.
authors.forename: Guangsheng
authors.initials: G
authors.lastname: Guo
keywords: Edge-oriented MoS2 nanosheets; HER catalysis; MoS2/graphene composite; interlayer-expanded MoS2 nanosheets; microwave solvothermal reaction