Abstract
Two-dimension (2D) molybdenum disulfide (MoS2) exhibits good performances in hydrogen evolution reaction (HER) and photocatalytic activity. In this paper, the 2D 1 T/2H-MoS2 nanosheet was high-efficiently prepared through a one-step hydrothermal reaction with sodium ethyl dithiocarbonate (SEDTC) and hexaammonium heptamolybdate (HAHM) separately as S and Mo sources, as well as characterized by XRD, Raman spectra, HRTEM, AFM and XPS. Raman spectra and XPS recommended the as-synthesized molybdenum sulfide was composed of 2H and 1 T phases, and it had monolayer structures with a size of ∼ 40 nm as observed by HRTEM and AFM. EDS and XPS revealed that the molybdenum sulfide nanosheet had a chemical composition of MoS1.91 providing richly active Mo and S atoms, especially part-coordinated and 1 T-phase Mo atoms, which endowed it to exhibit the specific characteristics in HER and photocatalytic degradation of organic pollutants. The Tafel slope of the as-prepared MoS2 reached 59.6 mV·dec−1 and its hydrogen evolution overpotential was close to 296 mV. Exposing 10 h under visible light, 1 g MoS2 samples photocatalytically degraded 5.945 g potassium hexyl dithiocarbonate, an organic pollutant in mine's wastewater.
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