期刊
NANO ENERGY
卷 15, 期 -, 页码 625-633出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2015.05.024
关键词
Charge transfer; Energy bandalignment; BiVO4; Gold nanoparticles; Watersplitting; Photochemistry
类别
资金
- Ministry of Science and Technology, R.O.C. [MOST 103-2119-M-009-003-MY3]
- Center for Interdisciplinary Science of National Chiao Tung University, Ministry of Education, R.O.C. [MOE-ATU 104W961]
- Ministry of Education Malaysia [FRGS/1/2014/SG06/MUSM/03/1]
Heterostructure provides a powerful route in manipulating electrical transport, optical response, electrolytic water splitting and water treatment of complex oxides. As a model for noble metal/ complex oxide heterostructures, we have successfully prepared Au/BiVO4 (BVO) heterostructures in which the Au nanoparticles (NPs) with various sizes and densities were uniformly deposited on the {001} facets of epitaxial BVO thin films. The heterostructures exhibit significantly enhanced photoactivities in both dye degradation and electrolytic water splitting. By employing X-ray photoelectron spectroscopy, the energy band alignment of Au/BVO heterojunction suggests a charge separation at their interfaces, that can manipulate the photoexcited electron-hole pairs and photocatalytic efficiency of the heterostructures. Photogenerated carrier injection, which mainly affects the photoactivity of photocatalysis, was detected across Au/BVO interfaces by ultrafast dynamics spectroscopy. This study delivers a general approach to probe and understand the photochemistry of noble metal-complex oxide heterostructures for photoconversion applications. (C) 2015 Elsevier Ltd. All rights reserved.
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