Hollow and Core–Shell Nanostructure Co3O4 Derived from a Metal Formate Framework toward High Catalytic Activity of CO Oxidation

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Key Laboratory of Energy Materials Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Physics and Chemistry Detecting Center, and §Institute of Applied Chemistry, Xinjiang University, Urumqi, Xinjiang 830046, P. R. China
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Cite this: ACS Appl. Nano Mater. 2018, 1, 2, 800–806
Publication Date (Web):February 5, 2018
Copyright © 2018 American Chemical Society
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Hollow and core–shell particles are currently attracting global attention because of their special properties. We herein proposed a facile self-sacrificial template strategy for the synthesis of cobalt tetraoxide (Co3O4) with hollow and core–shell nanostructures. Starting with metal formate framework (MFF) template [CH3NH3][Co(HCOO)3], a series of core–shell nanostructure [email protected](OH)2 microboxes and hollow Co(OH)2-H were successfully obtained through a reaction between the MFF template and sodium hydroxide (NaOH) combined with different washing processes. Finally, hollow and core–shell nanostructure Co3O4 products were obtained after calcination, which inherited the structures from corresponding precursors. In addition, the formation processes of hollow and core–shell nanostructures were studied. Moreover, the catalytic activity of the as-obtained Co3O4 for carbon monoxide (CO) oxidation was investigated. Such hollow and core–shell nanostructures gave different physiochemical properties. Hollow structure Co3O4 exhibited higher catalytic activity than that of core–shell nanostructure Co3O4, which reached 100% CO conversion at 90 °C. Furthermore, the core–shell nanostructure Co3O4 had higher long-term catalytic stability than that of the hollow structure Co3O4. We explored the relationships between the different structures and catalytic properties.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsanm.7b00246.

  • TEM images of the MFF reacted with NaOH with various ratios after H2O washing, SEM images and PXRD patterns of Co(OH)2-H, pore-size distribution and HR-TEM images of Co3O4-CS, Co3O4-CS-2, Co3O4-CS-4, and Co3O4-H, SEM images and CO conversion versus temperature curve of milled Co3O4-H, catalytic activity of CO oxidation, and the reaction setups of cobalt oxide reported in the open literature (PDF)

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