期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 10, 页码 3344-3351出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta14108j
关键词
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资金
- Ministry of Science and Technology of China [2014CB239402, 2013CB834505]
- National Natural Science Foundation of China [51322213, 21301183, 20901081, 51172245, 91127005]
- Chinese Academy of Sciences [KGCX2-EW-311-3]
- Beijing Natural Science Foundation [2112042, 2122054]
- Scientific Research Foundation for Returned Scholars of Ministry of Education of China
Carbon quantum dots modified P25 TiO2 composites (CQDs/P25) with a dyade-like structure were prepared via a facile one-step hydrothermal reaction. CQDs/P25 exhibited improved photocatalytic H-2 evolution under UV-Vis and visible light (lambda > 450 nm) irradiation without loading any noble metal cocatalyst, compared to pure P25. A possible mechanism of the photocatalytic H-2 production activity over CQDs/P25 was proposed based on detailed measurements of the transient photocurrent response, surface photovoltage and hydroxyl radicals. CQDs play dual roles on the improved photocatalytic activity of CQDs/P25. Under UV-Vis light irradiation CQDs act as an electron reservoir to improve the efficient separation of the photoinduced electron-hole pairs of P25. However, under visible light irradiation CQDs act as a photosensitizer to sensitize P25 into a visible light response dyade structure for H-2 evolution.
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