Journal
CHINESE SCIENCE BULLETIN
Volume 59, Issue 18, Pages 2191-2198Publisher
SCIENCE PRESS
DOI: 10.1007/s11434-014-0188-7
Keywords
Titanium oxide; Charge carrier separation; Metallic plasmon resonance; Photoanode
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Funding
- National Natural Science Foundation of China [51102194, 51323011, 51121092]
- Ministry of Education [20110201120040]
- Nano Research Program of Suzhou City [ZXG2013003]
- Foundation for the Author of National Excellent Doctoral Dissertation of China [201335]
- Fundamental Research Funds for the Central Universities
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To improve the separation efficiency of photoinduced charge carries, Au@SiO2 nanoparticles (NPs) with core-shell structure were loaded onto the surface of TiO2 nanorods grown on fluorine-doped tin oxide substrate by a facile two-step process. The resulted Au@SiO2/TiO2 photoanodes were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, as well as photoelectrochemical measurements. Compared with pristine TiO2 nanorod film, the Au@SiO2/TiO2 films showed remarkable enhancement in photoelectrochemical water splitting, with incident photon-to-current conversion efficiency increasing from 31 % to 37 % at 380 nm at 0.7 V versus saturated calomel electrode. This could be interpreted by the effect of metallic surface plasmon resonance of Au@SiO2 NPs, which would generate an intense electromagnetic field with spatially nonhomogenous distributed intensity. As a result, the charge carriers generated in the near-surface region of TiO2 nanorods could be easily separated. This modification method based on the effect of metallic surface plasmon resonance for promoted charge carrier separation provides a promising way to develop semiconductor photoelectrodes with high solar water-splitting performance.
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