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

The electronic coupling and photocatalytic activity of Ag{sub 2}CO{sub 3}–TiO{sub 2} 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 TiO{sub 2} by N-doping leads not only to the enhanced absorption of visible light but also to the promoted hole transfer from Ag{sub 2}CO{sub 3} to TiO{sub 2}, resulting in the efficient spatial separation of photogenerated electrons and holes. While the undoped Ag{sub 2}CO{sub 3}–TiO{sub 2} nanocomposite shows an inferior photocatalytic activity to the pure Ag{sub 2}CO{sub 3}, the photocatalyst performance of N-doped nanocomposite is better than those of Ag{sub 2}CO{sub 3} and undoped Ag{sub 2}CO{sub 3}–TiO{sub 2} 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 hybrid-type photocatalysts. - Highlights: • The band position of Ag{sub 2}CO{sub 3}–TiO{sub 2} can be effectively tailored by nitrogen doping. • The N-doping leads to the improvement of charge separation. • The N-doped Ag{sub 2}CO{sub 3}–TiO{sub 2} shows high photocatalytic activity.
Authors:
; ;  [1] ;  [2] ;  [1]
  1. Department of Chemistry and Nanoscience, College of Natural Sciences, Ewha Womans University, Seoul 120-750 (Korea, Republic of)
  2. Smithers-Oasis Korea, 196-4 YongJungDoHa-Gil 157, Cheonan, Chungnum-Do (Korea, Republic of)
Publication Date:
OSTI Identifier:
22486804
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 230; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION; COBALT OXIDES; COUPLING; DOPED MATERIALS; ELECTRONS; HOLES; NANOCOMPOSITES; NITROGEN; OPTIMIZATION; PERFORMANCE; PHOTOCATALYSIS; SILVER COMPOUNDS; TITANIUM OXIDES; VALENCE; VISIBLE RADIATION