Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 631, Issue -, Pages 120-124Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.01.091
Keywords
Phosphate-bridged TiO2-BiVO4 nanocomposite; Visible-excited energetic electron transfer; Photogenerated charge lifetime; Water splitting
Categories
Funding
- National Scientific Fund for Distinguished Young Scholars [51125033]
- Funds for Creative Research Group of China [51121062]
- National Nature Science Foundation of China [U1401245, 21206034]
- Program for Innovative Research Team in Chinese Universities [IRT1237]
- Research Project of Chinese Ministry of Education [213011A]
- Specialized Research Fund for the Doctoral Program of Higher Education [20122301110002]
- Chang Jiang Scholar Candidates Programme for Heilongjiang Universities [2012CJHB003]
- Science Foundation for Excellent Youth of Harbin City of China [2014RFYXJ002]
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In this work, phosphate-bridged TiO2-BiVO4 is fabricated by a simple wet-chemical method and exploited for water splitting under visible irradiation. By means of ultra-low-temperature electron-spin resonance (ESR) measurements and the designed photoelectrochemical experiments, the spatial transfers of visible-excited energetic electrons from BiVO4 to TiO2 in the fabricated nanocomposites are identified for the first time. Moreover, the phosphate bridges between BiVO4 and TiO2 are successfully built so that the transfers of visible-excited charges in space are greatly improved. This would prolong the lifetime and promote the separation of photogenerated charges. Interestingly, the phosphate-bridged TiO2-BiVO4 nanocomposite exhibits much high photocatalytic activities for water oxidation and H-2 evolution by about three times compared to the un-bridged TiO2-BiVO4 one. This work will provide new ideas to develop visible-response photocatalysts with high visible activities for water splitting. (C) 2015 Elsevier B.V. All rights reserved.
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