1T/2H multi-phase MoS2 heterostructures: synthesis, characterization and thermal catalysis decomposition of dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate,New Journal of Chemistry

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1T/2H multi-phase MoS2 heterostructures: synthesis, characterization and thermal catalysis decomposition of dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2019-05-30 00:00:00 , DOI: 10.1039/c9nj02749a
Lishuang Hu _{1,

2,

3,

4,

5} , Yang Liu _{1,

2,

3,

4} , Shuangqi Hu _{1,

2,

3,

4} , Yanping Wang _{4,

6,

7}

Affiliation

MoS₂ has attracted widespread attention in catalysis fields due to its unique physical and chemical properties. However, the effect of thermal catalysis applications on the thermal decomposition of energetic materials has not been reported yet. In this work, we demonstrated that 1T/2H multi-phase MoS₂ heterostructures were fabricated through a facile hydrothermal reaction and discovered that the 1T/2H-MoS₂ heterostructure possesses intrinsic catalytic activity for the thermal decomposition of energetic salts such as dihydroxylammonium-5,5′-bistetrazole-1,1′-diolate (TKX-50). The morphology, phase structure, and properties of the as-prepared catalysts were characterized and the catalytic effect of the multi-phase MoS₂ heterostructure on the thermal decomposition of TKX-50 was evaluated. With 10 wt% 1T/2H-MoS₂ heterostructure added, the peak temperature decreased from 250.8 °C to 198.5 °C, and the activation energy of TKX-50 from 220.07 kJ mol⁻¹ to 133.04 kJ mol⁻¹, respectively, which proved the promotion of the thermal decomposition of TKX-50 effectively. Furthermore, the possible catalytic mechanism for the TKX-50 decomposition was discussed. Under heat excitation, the conduction band electrons (e_cb⁻) and valence band holes (h⁺) were excited and generated on MoS₂ surfaces, which facilitated proton transfer from the H atom of NH₃OH⁺ to the O atom of bistetrazole, and boosted the decomposition of TKX-50 further. This work may open up a new potential way for thermal catalysis application of MoS₂ in the field of energetic materials.

中文翻译：

1T / 2H多相MoS ₂异质结构：5,5'-双四唑-1,1'-二醇盐二羟基铵的合成，表征和热催化分解

MoS ₂由于其独特的物理和化学性质而在催化领域引起了广泛的关注。然而，尚未报道热催化应用对高能材料的热分解的影响。在这项工作中，我们证明了1T / 2H多相MoS ₂异质结构是通过容易的水热反应制备的，并且发现1T / 2H-MoS ₂异质结构具有对高能盐（如二羟基lam-5）热分解的固有催化活性。，5′-双四唑-1，1′-二醇盐（TKX-50）。表征了所制备催化剂的形态，相结构和性能，并表征了多相MoS ₂的催化作用。评价了TKX-50热分解的异质结构。添加10 wt％的1T / 2H-MoS ₂异质结构后，峰值温度从250.8°C降至198.5°C，TKX-50的活化能从220.07 kJ mol ^-1降至133.04 kJ mol ^-1。证明有效促进了TKX-50的热分解。此外，还讨论了TKX-50分解的可能的催化机理。在加热下激发，导带电子（e _CB^-）和价带空穴（h ⁺）被激发，并且在生成的MoS _2层的表面，从NH的H原子这有利于质子转移₃ OH ⁺联苯并噻唑的O原子，进一步促进了TKX-50的分解。这项工作可能会开辟一种新的潜在途径，将MoS ₂热催化应用于高能材料领域。

更新日期：2019-05-30

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