Increasing the Oxygen Vacancy Density on the TiO2 Surface by La-Doping for Dye-Sensitized Solar Cells

被引：155
作者：
Zhang, Jiyuan [1 ,2 ]
Zhao, Zongyan [1 ,2 ]
Wang, Xiangyan [1 ,3 ]
Yu, Tao [1 ,2 ,4 ]
Guan, Jie [1 ,2 ]
Yu, Zhentao [1 ,2 ]
Li, Zhaosheng [1 ,3 ]
Zou, Zhigang [1 ,2 ,3 ]
机构：
[1] Nanjing Univ, Ecomat & Renewable Energy Res Ctr, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
[3] Nanjing Univ, Dept Mat Sci & Engn, Nanjing 210093, Peoples R China
[4] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 43期
基金：
中国国家自然科学基金;
关键词：
DOPED TIO2; PHOTOCATALYTIC ACTIVITY; PHASE-TRANSFORMATION; TITANIUM-OXIDE; ANATASE; ADSORPTION; NANOPARTICLES; WATER;
D O I：
10.1021/jp106648c
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Facilitated by TiO2 particles absorbing La3+ in hydrosol, La-doped TiO2 was prepared by a sol-hydrothermal method. Electron paramagnetic resonance and Brunauer-Emmett-Teller (BET) surface area analysis showed that the obtained La-doped anatase TiO2 surface provided a higher density of oxygen vacancies without a change in the BET surface area. A theoretical calculation was carried out to explain the generation mechanism of the increased oxygen vacancies. The results showed that the La-doped anatase TiO2 (101) surface tends to engender oxygen vacancies. The photoelectric conversion efficiency of dye-sensitized solar cells fabricated from 1 mol % La-doped TiO2 reached 6.72%, which gave an efficiency improved by 13.5% compared with that of the cells fabricated from pure TiO2. The improvement in the efficiency was ascribed to more dye absorbed on the surface of TiO2.
引用
收藏
页码：18396 / 18400
页数：5
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