標題: Heteroepitaxial approach to explore charge dynamics across Au/BiVO4 interface for photoactivity enhancement
作者: Chien Nguyen Van
Chang, Wei Sea
Chen, Jhih-Wei
Tsai, Kai-An
Tzeng, Wen-Yen
Lin, Yan-Cheng
Kuo, Ho-Hung
Liu, Heng-Jui
Chang, Kao-Der
Chou, Wu-Ching
Wu, Chung-Lin
Chen, Yi-Chun
Luo, Chih-Wei
Hsu, Yung-Jung
Chu, Ying-Hao
材料科學與工程學系
電子物理學系
Department of Materials Science and Engineering
Department of Electrophysics
關鍵字: Charge transfer;Energy bandalignment;BiVO4;Gold nanoparticles;Watersplitting;Photochemistry
公開日期: 1-Jul-2015
摘要: 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.
URI: http://dx.doi.org/10.1016/j.nanoen.2015.05.024
http://hdl.handle.net/11536/129462
ISSN: 2211-2855
DOI: 10.1016/j.nanoen.2015.05.024
期刊: NANO ENERGY
Volume: 15
起始頁: 625
結束頁: 633
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