Regulating safety and energy release of energetic materials by manipulation of molybdenum disulfide phase.

A phase manipulation of molybdenum disulfide strategy has been adopted for fast decomposition of AP and HMX with safety operation performance. • Li-ion assisted manipulation of MoS 2 made it into highly active 1T phase. • 1T-MoS 2 possessed enhanced active sites, electrical conductivity and porosity. • Intrinsic lamellar MoS 2 improved safety performances of AP and HMX. • Fast energy releasing of HMX and AP was gained using 1T-MoS 2 catalyst. Designing advanced component for synergistically achieving the safety performance and energy releasing of widely studied energetic materials (EMs) is of far-reaching significance in composite solid propellants. Herein, molybdenum disulfide with high-active 1T phase (1T-MoS 2) was engineered by a phase-manipulation strategy through chemical Li-intercalation from its original state (2H-MoS 2). The as-prepared 1T-MoS 2 was used for the improved safety and decomposition performances of two typical EMs (ammonium perchlorate: AP and 1,3,5,7-tetranittro-1,3,5,7-tetrazocane: HMX) in propellants. Lubricant 1T-MoS 2 endowed considerable advances in safety performance of EMs, with remarkably reduced the impact and friction sensitivity. Besides, fast energy-releasing performance with visibly lower activation energy was realized for AP@1T-MoS 2 and HMX@1T-MoS 2. In addition, large decomposition heats were simultaneously achieved. Computational studies disclosed this improvement could be attributed to the multi-coupling effect arising from the promoted electron transfer capability, strong affiliations of catalyst/burning products and the abundant actives sites of 1T-MoS 2 phase. Our results demonstrate substantial improvements in the synergistical design of safe and fast-decomposed AP and HMX complex for solid propellants. [ABSTRACT FROM AUTHOR]