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Fe3O4/WO3 Hierarchical Core–Shell Structure: High-Performance and Recyclable Visible-Light Photocatalysis

Authors

  • Dr. Guangcheng Xi,

    1. International Center for Materials Nanoarchitectonic and Photocatalytic Materials Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)
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  • Dr. Bing Yue,

    1. International Center for Materials Nanoarchitectonic and Photocatalytic Materials Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)
    2. Department of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810 (Japan), Fax: (+81) 29-859-2601
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  • Dr. Junyu Cao,

    1. International Center for Materials Nanoarchitectonic and Photocatalytic Materials Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)
    2. Department of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810 (Japan), Fax: (+81) 29-859-2601
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  • Prof. Jinhua Ye

    Corresponding author
    1. International Center for Materials Nanoarchitectonic and Photocatalytic Materials Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)
    2. Department of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810 (Japan), Fax: (+81) 29-859-2601
    • International Center for Materials Nanoarchitectonic and Photocatalytic Materials Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)
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Abstract

A facile solvothermal epitaxial growth combined with a mild oxidation route has been developed for the fabrication of a magnetically recyclable Fe3O4/WO3 core–shell visible-light photocatalyst. In this core–shell structured photocatalyst, visible-light-active WO3 nanoplates (the shells) with high surface area are used as a medium to harvest absorbed photons and convert them to photogenerated charges, while conductive Fe3O4 microspheres (the cores) are used as charge collectors to transport the photogenerated charges. This is a new role for magnetite. The Fe3O4/WO3 core–shell structured photocatalysts possess large surface-exposure area, high visible-light-absorption efficiency, stable recyclability, and efficient charge-separation properties, the combination of which has rarely been reported in other visible-light-active photocatalysts. Photoelectrochemical investigations verify that the core–shell structured Fe3O4/WO3 has a more effective photoconversion capability than pure WO3 or Fe3O4. At the same time, the visible-light photocatalytic ability of the Fe3O4/WO3 photocatalyst has significantly enhanced activity in the photodegradation of organic-dye materials. The results presented herein provide new insights into core–shell materials as high-performance visible-light photocatalysts and their potential use in environmental protection.

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