Au@SiO2 core/shell nanoparticle-decorated TiO2 nanorod arrays for enhanced photoelectrochemical water splitting |
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Authors: | Jianan Chen Miao Yu Yuhao Wang Shaohua Shen Meng Wang Liejin Guo |
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Institution: | 1. International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, China 2. School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
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Abstract: | 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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Keywords: | Titanium oxide Charge carderseparation Metallic plasmon resonance Photoanode |
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