au@sio2核壳结构纳米颗粒修饰tio2纳米棒阵列光电化学分解水性能研究.doc


******@SiO2 core/shell nanoparticles decorated TiO2 nanorod
arrays for enhanced photoelectrochemical water splitting#
SHEN Shaohua, CHEN Jianan*
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(State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University,
Xi'an 710049)
Abstract: To improve the separation efficiency of photo-induced charge carries, ******@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 ******@SiO2/TiO2 photoanodes were characterized by
X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy
(TEM) as well as photoelectrochemical measurements. pared to pristine TiO2 nanorod film,
the ******@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 V vs. SCE. This could be interpreted by the effect of metallic surface plasmon resonance of
******@SiO2 nanoparticles, which would generate an intense ic 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 s