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Au@SiO2 core/shell nanoparticles decorated TiO2 nanorod arrays for enhanced photoelectrochemical water splitting
SHEN Shaohua 1 * #,CHEN Jianan 2
1.State Key Laboratory of Multiphase Flow in Power Engineering, Xi\'an Jiaotong University, Xi\'an 710049
2.State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
*Correspondence author
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Funding: Doctoral Program of the Ministry of Education （No.no. 20110201120040）, National Natural Science Foundation of China （No.no. 51102194, and no. 51121092）
Opened online: 2 August 2013
Accepted by: none
Citation: SHEN Shaohua,CHEN Jianan.Au@SiO2 core/shell nanoparticles decorated TiO2 nanorod arrays for enhanced photoelectrochemical water splitting[OL]. [ 2 August 2013] http://en.paper.edu.cn/en_releasepaper/content/4553403
 
 
To improve the separation efficiency of photo-induced charge carries, Au@SiO2 nanoparticles with core-shell structure were loaded onto the surface of TiO2 nanorods grown on FTO substrate by a facile two-step process. The resulted Au@SiO2/TiO2 photoanodes were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) as well as photoelectrochemical measurements. When compared to pristine TiO2 nanorod film, the Au@SiO2/TiO2 films showed remarkable enhancement in photoelectrochemical water splitting, with incident photon to current conversion efficiency (IPCE) increased from 31% to 37% at 380 nm and 0.8 V vs. SCE. This could be interpreted by the effect of metallic surface plasmon resonance of Au@SiO2 nanoparticles, which would generate an intense electromagnetic field with spatially non-homogenous 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.
Keywords:titanium oxide; charge carrier separation; metallic plasmon resonance; photoanode
 
 
 

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