Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 48, Pages 15258-15264Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta13167j
Keywords
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Funding
- National Natural Science Foundation of China [91022023, 21076076]
- SRF for ROCS and SEM
- Programme for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Major Basic Research Programme of Science and Technology Commission of Shanghai Municipality [10JC1403200]
- Fundamental Research Funds for the Central Universities [222201314035]
- Australian Research Council [FT120100913]
- Shanghai Municipal Natural Science Foundation [12ZR1407500]
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Solar hydrogen production assisted with semiconductor materials is a promising way to provide alternative energy sources in the future. Such a photocatalytic reaction normally takes place on the active sites of the catalysts surface, and the identification of the active sites is crucial for understanding the photocatalytic reaction mechanism and further improving the photocatalytic efficiency. However, the active sites of model catalysts are still largely disputed because of their structural complexity. Conventionally, H-2 evolution from solar water splitting over Pt/TiO2 is widely deemed to take place on metallic Pt nanoparticles. Oppositely, we report through a combined experimental and theoretical approach, that metallic Pt nanoparticles have little contribution to the activity of photocatalytic H-2 evolution; the oxidized Pt species embedded on the TiO2 surface are the key active sites and primarily responsible for the activity of the hydrogen evolution Pt/TiO2 photocatalyst.
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