Enhanced H2 Generation of Au-Loaded, Nitrogen-Doped TiO2 Hierarchical Nanostructures under Visible Light

Authors

  • Brundabana Naik,

    1. Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Daejeon, Republic of Korea
    2. Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
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  • Sun Mi Kim,

    1. Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Daejeon, Republic of Korea
    2. Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
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  • Chan Ho Jung,

    1. Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Daejeon, Republic of Korea
    2. Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
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  • Song Yi Moon,

    1. Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Daejeon, Republic of Korea
    2. Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
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  • Sang Hoon Kim,

    1. Center for Materials Architecturing, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
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  • Jeong Young Park

    Corresponding author
    1. Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Daejeon, Republic of Korea
    2. Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
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Abstract

Hierarchical N-doped TiO2 nanostructured catalysts with micro-, meso-, and macroporosity are synthesized by a facile self-formation route using ammonia and titanium isopropoxide precursor. UV–vis diffuse reflectance spectra confirm the red shift and band gap narrowing due to the doping of N species in the TiO2 nanoporous catalyst. Hierarchical macroporosity with fibrous channel patterning is observed and well preserved even after calcination at 800 °C, indicating thermal stability, whereas micro- and mesoporosity are lost after calcination at 500 °C. The photocatalytic activity of hiearchical N doped TiO2 catalysts loaded with Au is evaluated for H2 production reaction in visible light. The enhanced photocatalytic activity is attributed to the combined synergetic effect of N doping for visible light absorption, micro- and mesoporosity for an increase of effective surface area and light harvestation, and hierarchical macroporous fibrous structure for multiple reflection and effective charge transfer.

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