Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 43, Issue 10, Pages 4845-4855Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2018.01.117
Keywords
Graphitic carbon nitride; Tungsten trioxide; Photocatalysts; Hydrogen production; Z-scheme photocatalyst
Categories
Funding
- NSF of China [51572046, 51603037]
- MOE of China [111-2-04, IRT_16R13]
- STC of Shanghai [16JC1400700, 15ZR1401200, 16XD1400100]
- SMEC [2017-01-07-00-03-E00055]
- Shanghai ChenGuang Program [15CG33]
- Shanghai Natural Science Foundation [16ZR1401500]
- Shanghai Sailing Prog ram [16YF1400400]
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WO3/g-C3N4 two-dimensional (2D) composite photocatalysts were prepared through a simple hydrothermal method followed by a post thermal treatment. The H-2 generation activity of these photocatalysts in the visible light was evaluated. The photocatalysts were characterized by X-ray powder diffraction, Fourier transform infrared spectra, transmission electron microscopy and UV-vis diffuse reflectance spectroscopy et al. These results show that the orthorhombic-phase WO3 nanoparticles with a grain size from 5 to 80 nm were successfully anchored on g-C3N4 nanosheets surface with intimate contact. Furthermore, the charge separation mechanisms of photo-generated charge carriers of the 2D WO3/g-C3N4 photocatalysts were further studied by photoelectrochemical response and electrochemical impedance spectroscopy. The result shows that the 2D WO3/g-C3N4 photocatalyst with 10 wt% WO3 possesses the maximum photocatalytic performance for H-2 generation, as high as of 1853 mu mol h(-1) g(-1), which is about 6.5 times higher than that of bare g-C3N4, indicating the fast injection of interface interaction between 2D g-C3N4 and WO3. The increased photocatalytic performance of the composite photocatalyst can be attributed to the enhanced absorption of visible light, the higher photo-generated electrons and holes separation efficiency and low recombination rate of electrons and holes generated by photoexcitation. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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