Double-shelled hollow LaNiO3 nanocage as nanoreactors with remarkable catalytic performance: Illustrating the special morphology and performance relationship
Double-shelled hollow LaNiO3 nanocage as nanoreactors with remarkable catalytic performance: Illustrating the special morphology and performance relationship
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DOI：
10.1016/j.mcat.2018.02.016
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发表时间：
2018
影响因子：
4.6
通讯作者：
Honggen Peng
中科院分区：
文献类型：
--
作者：
Cheng Peng;Cheng Rao;Yongjun Ji;Li Zhang;Wenming Liu;Xiang Wang;Xianglan Xu;Zheng Wang;Ning Zhang;Honggen Peng
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.
