| Autor: |
Wang, Fenglong, Jin, Zuanming, Jiang, Yijiao, Backus, Ellen H. G., Bonn, Mischa, Lou, Shi Nee, Turchinovich, Dmitry, Amala, Rose |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
APPL CATAL B-ENVIRON 198 (2016) 25 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1016/j.apcatb.2016.05.048 |
| Popis: |
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, favoring 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 picoseconds. 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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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