期刊
ADVANCED MATERIALS INTERFACES
卷 2, 期 14, 页码 -出版社
WILEY
DOI: 10.1002/admi.201500280
关键词
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资金
- National Natural Science Foundation of China [51323011, 51236007]
- Program for New Century Excellent Talents in University [NCET-13-0455]
- Natural Science Foundation of Shaanxi Province [2014KW07-02]
- Natural Science Foundation of Jiangsu Province [BK20141212]
- Nano Research Program of Suzhou City [ZXG201442, ZXG2013003]
- Foundation for the Author of National Excellent Doctoral Dissertation of China [201335]
- Fundamental Research Funds for the Central Universities
- Ministry of Science and Technology (MoST) [01-2112-M-213-004-MY3]
Graphitic carbon nitride modified with plasmonic Ag@SiO2 core-shell nanoparticles (g-C3N4/Ag@SiO2) are proposed for enhanced photocatalytic solar hydrogen evolution under visible light. Nanosized gaps between the plasmonic Ag nanoparticles (NPs) and g-C3N4 are created and precisely modulated to be 8, 12, 17, and 21 nm by coating SiO2 shells on the Ag NPs. The optimized photocatalytic hydrogen production activity for g-C3N4/Ag@SiO2 is achieved with a nanogap of 12 nm (11.4 mu mol h(-1)) to be more than twice as high as that of pure g-C3N4 (5.6 mu mol h(-1)). The plasmon resonance energy transfer (PRET) effect of Ag NPs is innovatively proved from a physical view on polymer semiconductors for photoredox catalysis. The PRET effect favors the charge carrier separation by inducing electron-hole pairs efficiently formed in the near-surface region of g-C3N4. Furthermore, via engineering the width of the nanogap, the PRET and energy-loss Forster resonance energy transfer processes are perfectly balanced, resulting in considerable enhancement of photocatalytic hydrogen production activity over the g-C3N4/Ag@SiO2 plasmonic photocatalyst.
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