Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 198, Issue -, Pages 25-31Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2016.05.048
Keywords
Hydrogen generation; In2S3/Pt-TiO2; Visible-light photocatalysis; Charge transfer and separation; Optical pump-terahertz probe spectroscopy
Funding
- ARC Discovery Early Career Researcher Award [DE120100329]
- ARC Discovery Project [DP140102432]
- Australia Nanotechnology Network (ANN)
- German Academic Exchange Service (DAAD)
- ERC [336679]
- European Commission (EU Career Integration Grant) [334324]
- European Research Council (ERC) [336679] Funding Source: European Research Council (ERC)
- Australian Research Council [DE120100329] Funding Source: Australian Research Council
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A simple refluxing wet-chemical approach is employed for fabricating In2S3/Pt-TiO2 heterogeneous catalysts for hydrogen generation under visible light irradiation. When the mass ratio between Pt-TiO2 and cubic-phased In2S3 (denoted as In2S3/Pt-TiO2) is two, the composite catalyst shows the highest hydrogen production, which exhibits an 82-fold enhancement over in-situ deposited Pt-In2S3. UV-vis diffuse reflectance and valence band X-ray photoelectron spectra elucidate that the conduction band of In2S3 is 0.3 eV more negative compared to that of TiO2, favouring charge separation in the nanocomposites. Photoelectrochemical transient photo-current measurements and optical pump - terahertz probe spectroscopic studies further corroborate the charge separation in In2S3/Pt-TiO2. The migration of photo induced electrons from the In2S3 conduction band to the TiO2 conduction band and subsequently into the Pt nanoparticles is found to occur within 5 ps. Based on the experimental evidence, a charge separation process is proposed which accounts for the enhanced activity exhibited by the In2S3/Pt-TiO2 composite catalysts. (C) 2016 Elsevier B.V. All rights reserved.
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