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Title: Enhanced visible light photocatalytic hydrogen evolution of sulfur-doped polymeric g-C{sub 3}N{sub 4} photocatalysts

Graphical abstract: - Highlights: • Sulfur-doped g-C{sub 3}N{sub 4} was prepared using thiourea as sulfur source. • The sulfur-doped g-C{sub 3}N{sub 4} shows significantly enhanced H{sub 2} evolution activity. • The doped sulfur species plays key roles in the improvement of H{sub 2} production. • Photocatalytic mechanism is proposed based on the experimental results. • The mechanism is confirmed by PL spectra and transient photocurrent curves. - Abstract: Visible light-activated sulfur-doped g-C{sub 3}N{sub 4} photocatalysts were successfully synthesized using thiourea as sulfur source. The obtained photocatalysts were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microcopy, ultraviolet–visible diffuse reflection spectroscopy, X-ray photoelectron spectroscopy, photoluminescence spectroscopy and transient photocurrent response. The sulfur-doped g-C{sub 3}N{sub 4} photocatalysts show beneficial effects on visible light absorption, electron–hole pair generation and separation. The sulfur species doped in the samples was identified as S{sup 2−} to replace N atoms in the g-C{sub 3}N{sub 4} framework. The photocatalytic activities of the sulfur-doped g-C{sub 3}N{sub 4} under visible light were evaluated by hydrogen evolution from water splitting in aqueous solution containing methanol. The sulfur-doped g-C{sub 3}N{sub 4} photocatalyst showed the highest photocatalytic performance with H{sub 2} evolution rate of 12.16 μmol h{sup −1}, about 6 times highermore » than un-doped g-C{sub 3}N{sub 4}. It can be concluded that the sulfur species play a vital role and act as active sites in the photocatalytic reaction. This novel sulfur-doped g-C{sub 3}N{sub 4} can be potentially used in energy and environmental applications.« less
Authors:
 [1] ;  [2] ; ; ; ;  [3]
  1. State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum Beijing, No. 18 Fuxue Rd., Beijing 102249 (China)
  2. (China)
  3. Department of Materials Science and Engineering, College of Science, China University of Petroleum Beijing, No. 18 Fuxue Rd., Beijing 102249 (China)
Publication Date:
OSTI Identifier:
22285120
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 48; Journal Issue: 10; Other Information: Copyright (c) 2013 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:
36 MATERIALS SCIENCE; AQUEOUS SOLUTIONS; ARSENIC SULFIDES; CARBON NITRIDES; DOPED MATERIALS; PHOTOCATALYSIS; PHOTOLUMINESCENCE; SEMICONDUCTOR MATERIALS; SULFUR; SYNTHESIS; THIOUREA; X-RAY PHOTOELECTRON SPECTROSCOPY