Enhanced H 2 Generation of Au-Loaded, Nitrogen-Doped TiO 2 Hierarchical Nanostructures under Visible Light

Title
Enhanced H 2 Generation of Au-Loaded, Nitrogen-Doped TiO 2 Hierarchical Nanostructures under Visible Light
Authors
Brundabana Naik김선미정찬호문송이김상훈박정영
Issue Date
2014-02
Publisher
Advanced Materials Interfaces
Citation
VOL 1, NO 1, 1300018-1-1300018-6
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 refl ectance spectra confi rm the red shift and band gap narrowing due to the doping of N species in the TiO2 nanoporous catalyst. Hierarchical macroporosity with fi brous 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 fi brous structure for multiple refl ection and effective charge transfer.
URI
http://pubs.kist.re.kr/handle/201004/47323
ISSN
21967350
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KIST Publication > Article
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