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

• Published in: New journal of chemistry 2019-07, Vol.43 (26), p.1434-1441
• Main Authors: Hu, Lishuang, Liu, Yang, Hu, Shuangqi, Wang, Yanping
• Format: Article
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/c9nj02749a

MoS 2 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 MoS 2 heterostructures were fabricated through a facile hydrothermal reaction and discovered that the 1T/2H-MoS 2 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 MoS 2 heterostructure on the thermal decomposition of TKX-50 was evaluated. With 10 wt% 1T/2H-MoS 2 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 MoS 2 surfaces, which facilitated proton transfer from the H atom of NH 3 OH + 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 MoS 2 in the field of energetic materials. Dependence of ln( β / T p 2 ) on 1/ T p for TKX-50 and mixtures with 10 wt% 2H-MoS 2 and 1T/2H-MoS 2 .