Perovskites with ABO₃ structure are the potential catalysts to replace the noble metals used in environmental catalysis, e.g. CO oxidation, volatile organic compounds (VOCs) and soot combustion. Herein, a novel double-shelled porous perovskite-type LaNiO₃ nanocage (assigned as LaNiO₃-Cage, with dual cage or cage in cage structure) was successfully synthesized via a facile hydrothermal method for the first time. LaNiO₃-Cage displayed superior activity and stability for CO oxidation. The morphology and structure properties of the samples were confirmed by Scanning Electron Microscope (SEM), Transmission Electron Microscopy (TEM), High-angle annular dark-field scanning transmission electron microscope (HAADF-STEM), Elemental mapping, Powder X-ray Diffraction (PXRD) and N₂ adsorption/desorption techniques. The inherent morphology-activity relationship was investigated through Temperature-Programmed Reduction with Hydrogen (H₂-TPR), Temperature-Programmed Desorption with Oxygen and Carbon monoxide (O₂-TPD and CO-TPD), and X-ray Photoelectron Spectroscopy (XPS) methods. LaNiO₃-Cage showed superior catalytic performance among all the comparison samples (with lowest Ea, highest reaction activity, rate and TOF value) which should be ascribed to its special double-shelled porous nanocage structure (main factors) as well as larger surface areas and more active surface oxygen species. It should be noted that the outstanding catalytic performance of LaNiO₃-Cage is well correlated with its special morphology structure. The porous double-shelled LaNiO₃ nanocage prepared in this work can be used to design other type of catalysts with the similar morphology as novel nanoreactors.

具有ABO ₃结构的钙钛矿是替代环境催化中使用的贵金属的潜在催化剂，例如CO氧化，挥发性有机化合物（VOC）和烟灰燃烧。在此，首次通过简便的水热法成功地合成了新型的双壳多孔钙钛矿型LaNiO ₃纳米笼（称为LaNiO ₃ -Cage，具有双笼或笼笼结构）。LaNiO ₃-笼显示出优异的活性和对CO氧化的稳定性。通过扫描电子显微镜（SEM），透射电子显微镜（TEM），高角度环形暗场扫描透射电子显微镜（HAADF-STEM），元素映射，粉末X射线衍射确定了样品的形貌和结构特性（PXRD）和N ₂吸附/解吸技术。通过氢的程序升温还原（H ₂ -TPR），氧气和一氧化碳的程序升温脱附（O ₂ -TPD和CO-TPD）和X射线光电子能谱（XPS）研究了固有的形态-活性关系。） 方法。LaNiO ₃-笼在所有比较样品中均显示出优异的催化性能（最低的Ea，最高的反应活性，速率和TOF值），这应归因于其特殊的双壳多孔纳米笼结构（主要因素）以及较大的表面积等等。活性表面氧种类。应当指出，LaNiO ₃ -Cage的出色催化性能与其特殊的形态结构密切相关。在这项工作中制备的多孔双壳LaNiO ₃纳米笼可用于设计与新型纳米反应器具有相似形态的其他类型的催化剂。