Large particle size and low specific surface area are two major factors of restricting metal oxides as combustion catalyst with high performance. The construction of three-dimensional (3D) heterojunction materials with synergistic effect is conducive to enhancing the catalytic activity. In this work, LaFeO₃ were prepared by a facile solvo-thermal method and post-heat treament. However, the LaFeO₃ with a large particle size shows poor specific surface area, resulting in a low catalytic activity. In order to improve its catalytic activity, a 3D core/shell heterostructured LaFeO₃@MnO₂ composite was constructed by coupling LaFeO₃ with MnO₂. The core-shell structured LaFeO₃@MnO₂ provides a larger specific surface area and high catalytic effect on the thermal decomposition of ammonium perchlorate (AP) with a reduced decomposition temperature from 403.73 °C to 281.38 °C, an enhanced energy release from 649.6 J·g⁻¹ to 966.5 J·g⁻¹, and a decreased apparent activation energy from 139.05 kJ·mol⁻¹ to 110.88 kJ·mol⁻¹. Additionally, LaFeO₃@MnO₂ also shows efficient catalytic effects on the thermal decomposition of hexanitrohexaazaisowurzitane (CL-20) and cyclotetramethylenetetranitramine (HMX)_.

大粒径和低比表面积是限制金属氧化物作为高性能燃烧催化剂的两个主要因素。具有协同作用的三维（3D）异质结材料的构造有利于增强催化活性。在这项工作中，LaFeO ₃是通过简便的溶剂热法和后热处理来制备的。但是，粒径大的LaFeO _3的比表面积差，催化活性低。为了提高其催化活性，通过将LaFeO ₃与MnO ₂偶联来构建3D核/壳异质结构的LaFeO ₃ @MnO ₂复合材料。核壳结构的LaFeO ₃@MnO ₂对高氯酸铵（AP）的热分解具有更大的比表面积和较高的催化作用，其分解温度从403.73°C降低到281.38°C，能量释放从649.6 J·g ^-1增强到966.5 J·g ^-1，并且表观活化能从139.05 kJ·mol ^-1降低到110.88 kJ·mol ^-1。另外，LaFeO ₃ @MnO ₂对六硝基六氮杂异纤锌矿型结构烷烃（CL-20）和环四亚甲基四硝胺（HMX）的热分解也显示出有效的催化作用_。