Enhanced H<sub>2</sub> Generation of Au‐Loaded, Nitrogen‐Doped TiO<sub>2</sub> Hierarchical Nanostructures under Visible Light

Brundabana Naik, Sun Mi Kim, Chan Ho Jung, Song Yi Moon, Sang Hoon Kim, Jeong Young Park

doi:10.1002/admi.201300018

<jats:p>Hierarchical N‐doped TiO<jats:sub>2</jats:sub> 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 TiO<jats:sub>2</jats:sub> 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 TiO<jats:sub>2</jats:sub> catalysts loaded with Au is evaluated for H<jats:sub>2</jats:sub> 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.</jats:p>

Enhanced H<sub>2</sub> Generation of Au‐Loaded, Nitrogen‐Doped TiO<sub>2</sub> Hierarchical Nanostructures under Visible Light

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Enhanced H<sub>2</sub> Generation of Au‐Loaded, Nitrogen‐Doped TiO<sub>2</sub> Hierarchical Nanostructures under Visible Light

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