One-pot hydrothermal synthesis of flower-like MnO₂ nanostructure with rich oxygen vacancy for catalysis thermal-induced pyrolysis of energetic molecular perovskite

The development of novel catalysts with high-activity to improve the thermal-induced pyrolysis of energetic molecular perovskite is of great importance. In this work, flower-like MnO₂ nanostructure was fabricated by a facile hydrothermal method with KMnO₄ as only precursor, and its thermal-induced pyrolysis performance of energetic molecular perovskite DAP-4 was studied. Results showed the catalysis thermal-induced pyrolysis peak temperature of DAP-4 had reduced by 50 °C from 386 °C (raw DAP-4) to 336 °C (DAP-4/10 wt% MnO₂) by the flower-like MnO₂ nanostructure, with rich oxygen vacancy added. The heat release of DAP-4 thermal-induced pyrolysis processes had a trend of increasing from 3423 J/g to 3563 J/g first and then decreasing to 2223 J/g. The apparent activation energy of DAP-4 had been reduced to 144 kJ/mol with addition of 10 wt% MnO₂. The catalysis mechanism of MnO₂ with flower-like nanostructure on thermal-induced pyrolysis of DAP-4 was provided.