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.

中文翻译：

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超细单层 1 T/2H-MoS2：制备、表征和惊人的光催化特性

摘要 二维 (2D) 二硫化钼 (MoS2) 在析氢反应 (HER) 和光催化活性方面表现出良好的性能。本文以二硫代碳酸钠（SEDTC）和七钼酸六铵（HAHM）分别作为S和Mo源，通过一步水热反应高效制备了2D 1 T/2H-MoS2纳米片，并具有以下特点： XRD、拉曼光谱、HRTEM、AFM 和 XPS。拉曼光谱和 XPS 表明合成的硫化钼由 2 H 和 1 T 相组成，并且通过 HRTEM 和 AFM 观察到它具有约 40 nm 大小的单层结构。EDS 和 XPS 表明，硫化钼纳米片的化学成分为 MoS1.91，提供了丰富的活性 Mo 和 S 原子，尤其是部分配位和 1 T 相的 Mo 原子，这使它在 HER 和光催化降解有机污染物方面表现出特殊的特性。所制备的MoS2的Tafel斜率达到59.6 mV·dec-1，其析氢过电位接近296 mV。在可见光下暴露 10 小时，1 g MoS2 样品光催化降解 5.945 g 二硫代碳酸己酯钾，这是矿山废水中的一种有机污染物。