期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 92, 期 9, 页码 1030-1036出版社
ELSEVIER
DOI: 10.1016/j.solmat.2008.03.003
关键词
TiO2; electron transfer; surface photovoltage; surface state; photocatalysis
资金
- National Nature Science Foundation of China [20431030, 20501007]
- New Century Excellent Talents [NCET-07-0259]
- Key Project of Science & Technology Research of Ministry of Education of China [207027]
- Science Foundation of Excellent Youth of Heilongjiang Province of China [JC200701]
- Science and Technology Project of Education Bureau of Heilongjiang province of China [11511283]
- Science Foundation of Harbin City of China [2005AFQXJ060]
Photoinduced electron transfer between anatase and rutile in nanosized TiO2, prepared by a sol-gel method, was revealed by means of the surface photovoltage technique, and its effects oil the photocatalytic performance in the degradation of a phenol Solution were investigated. Also, the role of the surface states during the processes Of photo-physics and photochemical reactions was discussed. In the as-prepared TiO2 Sample Consisting Of anatase and rutile, the photoinduced electrons can easily transfer from anatase surface states to rutile, as well as from anatase conduction band to rutile. These factors are responsible for the strong surface photovoltage response and high photocatalytic activity. Moreover, the surface states related to oxygen vacancies can induce photocatalytic reactions under visible irradiation, especially in the resulting biphase TiO2, due to the electron transfer from anatase surface states to rutile. (C) 2008 Elsevier B.V. All rights reserved.
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