Analysis of the Promoted Activity and Molecular Mechanism of Hydrogen Production over Fine Au–Pt Alloyed TiO2 Photocatalysts
| Autor: | Yijiao Jiang, Douglas J. Lawes, Graham E. Ball, Cuifeng Zhou, Zongwen Liu, Rose Amal, Fenglong Wang |
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| Rok vydání: | 2015 |
| Předmět: |
Photocurrent
Materials science Nanocomposite Analytical chemistry Nanoparticle 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 7. Clean energy 01 natural sciences Catalysis 0104 chemical sciences Chemical engineering X-ray photoelectron spectroscopy Molecular mechanism Photocatalysis 0210 nano-technology Hydrogen production |
| Zdroj: | ACS Catalysis. 5:3924-3931 |
| ISSN: | 2155-5435 |
| DOI: | 10.1021/acscatal.5b00623 |
| Popis: | Fine metal nanoparticles (2–3 nm; Au, Pt, and alloyed Au–Pt) with a narrow size distribution were deposited on active TiO2 through a facile chemical reduction method. Compared to the bare TiO2, a remarkable enhancement of up to 10-fold for photocatalytic hydrogen evolution was achieved on the alloyed nanocomposites. By using core level and valence band XPS analysis, two electronic properties are shown to contribute to the promoted photocatalytic activity: stronger metal–support interaction between the alloyed structures and TiO2 and higher electron population on the Au–Pt/TiO2 photocatalysts in comparison with the bare TiO2. Moreover, an improved charge separation over TiO2 using Au–Pt nanoparticles was clearly evidenced by the significant increase of photocurrent responses obtained from the photoelectrochemical measurements. For the first time, in situ 13C and 1H NMR spectroscopy was applied to monitor the gas–liquid–solid photocatalytic reactions under real working conditions. Via a two-electron oxidati... |
| Databáze: | OpenAIRE |
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