Journal
NANO LETTERS
Volume 17, Issue 3, Pages 1963-1969Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b05346
Keywords
Edge-oriented MoS2 nanosheets; interlayer-expanded MoS2 nanosheets; MoS2/graphene composite; microwave solvothermal reaction; HER catalysis
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Funding
- Temple University
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By selectively promoting heterogeneous nucleation/growth of MoS2 on graphene monolayer sheets, edge oriented (EO) MoS2 nanosheets with expanded interlayer spacing (similar to 9.4 angstrom) 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 MoS2 nanosheets per area of graphene sheets were tuned by controlling the reaction time in the microwave-assisted solvothermal reduction of ammonium tetrathiomolybdate [(NH4)(2)MoS4] 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 MoS2 sheets without edge-oriented geometry, highlighting the importance of synergistic effect between edge-oriented geometry and interlayer expansion on determining HER activity of MoS2 nanosheets. Quantitative analysis clearly shows the linear dependence of current density on the edge length of MoS2 nanosheets.
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