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 |
Appears in Collections: | Articles |