4.8 Article

WS2 and C-TiO2 Nanorods Acting as Effective Charge Separators on g-C3N4 to Boost Visible-Light Activated Hydrogen Production from Seawater

Journal

CHEMSUSCHEM
Volume 11, Issue 23, Pages 4077-4085

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201801819

Keywords

charge separators; g-C3N4 composite; hydrogen; photocatalysis; seawater splitting

Funding

  1. Thailand Research Fund [RSA6080017]
  2. NSFC [51421091]
  3. National Science Foundation for Distinguished Young Scholars for Hebei Province of China [E2016203376]

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Semiconductor photocatalysis is regarded as an ideal method for use in solving the energy shortage and environmental issues by converting solar energy to chemical energy. Herein, we have designed a facile synthetic methodology to obtain a ternary co-modified g-C3N4 composite via WS2 and carbon-doped TiO2 (C-TiO2) nanorods with highly efficient photocatalytic activity for hydrogen production from deionized (DI) water and a natural seawater system under visible-light illumination. This composite exhibits enhanced photocatalytic activity compared to the pristine g-C3N4, WS2, C-TiO2 nanorods, and the reference-modified g-C3N4 composite with individual WS2 or C-TiO2 nanorods. Co-modified g-C3N4 composite shows a great photostability in both DI water and seawater. Under lambda = 420 nm monochromatic light illumination, the apparent quantum efficiency of the co-modified g-C3N4 composite in seawater solution is 13.08%, which is higher than pure g-C3N4 (5.06%). WS2, TiO2, and g-C3N4 constitute a ternary heterojunction boosting the fast separation of photoinduced electron-hole pairs, which plays a crucial role in enhancing photocatalytic activity. Therefore, the WS2 and C-TiO2 nanorod co-modified g-C3N4 composite with high photocatalytic performance provides a promising candidate for rationally utilizing the seawater resource to produce clean chemical energy.

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