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Importance of the tuning of band position in optimizing the electronic coupling and photocatalytic activity of nanocomposite

Title
Importance of the tuning of band position in optimizing the electronic coupling and photocatalytic activity of nanocomposite
Authors
Jin, XiaoyanMok, Eun KyungBaek, Ji-WonPark, Sang-HyunHwang, Seong-Ju
Ewha Authors
황성주
SCOPUS Author ID
황성주scopus
Issue Date
2015
Journal Title
JOURNAL OF SOLID STATE CHEMISTRY
ISSN
0022-4596JCR Link1095-726XJCR Link
Citation
vol. 230, pp. 175 - 181
Keywords
Nitrogen dopingElectronic couplingNanocompositePhotocatalytic activityTitanium oxide
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The electronic coupling and photocatalytic activity of Ag2CO3-TiO2 nanocomposite can be optimized by the fine-tuning of the band position of titanium oxide with nitrogen doping. The increase of the valence band energy of TiO2 by N-doping leads not only to the enhanced absorption of visible light but also to the promoted hole transfer from Ag2CO3 to TiO2, resulting in the efficient spatial separation of photo-generated electrons and holes. While the undoped Ag2CO3-TiO2 nanocomposite shows an inferior photocatalytic activity to the pure Ag2CO3, the photocatalyst performance of N-doped nanocomposite is better than those of Ag2CO3 and undoped Ag2CO3-TiO2 nanocomposite. This observation underscores a significant enhancement of the photocatalytic activity of nanocomposite upon N-doping, a result of enhanced electronic coupling between the hybridized species. The present results clearly demonstrate the importance of the fine-tuning of band position in optimizing the photocatalytic activity of hybridtype photocatalysts. (C) 2015 Elsevier Inc. All rights reserved.
DOI
10.1016/j.jssc.2015.07.006
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자연과학대학 > 화학·나노과학전공 > Journal papers
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