Heteroepitaxial approach to explore charge dynamics across Au/BiVO4 interface for photoactivity enhancement

Chien Nguyen Van; Wei Sea Chang; Jhih Wei Chen; Kai An Tsai; Wen Yen Tzeng; Yan Cheng Lin; Ho Hung Kuo; Heng Jui Liu; Kao Der Chang; Wu Ching Chou; Chung Lin Wu; Yi Chun Chen; Chih Wei Luo; Yung Jung Hsu; Ying Hao Chu

doi:10.1016/j.nanoen.2015.05.024

Heteroepitaxial approach to explore charge dynamics across Au/BiVO₄ interface for photoactivity enhancement

Chien Nguyen Van, Wei Sea Chang, Jhih Wei Chen, Kai An Tsai, Wen Yen Tzeng, Yan Cheng Lin, Ho Hung Kuo, Heng Jui Liu, Kao Der Chang, Wu Ching Chou, Chung Lin Wu, Yi Chun Chen, Chih Wei Luo, Yung Jung Hsu, Ying Hao Chu

Department of Physics

Research output: Contribution to journal › Article › peer-review

70 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	625-633
Number of pages	9
Journal	Nano Energy
Volume	15
DOIs	https://doi.org/10.1016/j.nanoen.2015.05.024
Publication status	Published - 2015 Jul 1

All Science Journal Classification (ASJC) codes

Renewable Energy, Sustainability and the Environment
General Materials Science
Electrical and Electronic Engineering

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Van, C. N., Chang, W. S., Chen, J. W., Tsai, K. A., Tzeng, W. Y., Lin, Y. C., Kuo, H. H., Liu, H. J., Chang, K. D., Chou, W. C., Wu, C. L., Chen, Y. C., Luo, C. W., Hsu, Y. J., & Chu, Y. H. (2015). Heteroepitaxial approach to explore charge dynamics across Au/BiVO₄ interface for photoactivity enhancement. Nano Energy, 15, 625-633. https://doi.org/10.1016/j.nanoen.2015.05.024

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title = "Heteroepitaxial approach to explore charge dynamics across Au/BiVO4 interface for photoactivity enhancement",

abstract = "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.",

author = "Van, {Chien Nguyen} and Chang, {Wei Sea} and Chen, {Jhih Wei} and Tsai, {Kai An} and Tzeng, {Wen Yen} and Lin, {Yan Cheng} and Kuo, {Ho Hung} and Liu, {Heng Jui} and Chang, {Kao Der} and Chou, {Wu Ching} and Wu, {Chung Lin} and Chen, {Yi Chun} and Luo, {Chih Wei} and Hsu, {Yung Jung} and Chu, {Ying Hao}",

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doi = "10.1016/j.nanoen.2015.05.024",

language = "English",

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AU - Van, Chien Nguyen

AU - Chang, Wei Sea

AU - Chen, Jhih Wei

AU - Tsai, Kai An

AU - Tzeng, Wen Yen

AU - Lin, Yan Cheng

AU - Kuo, Ho Hung

AU - Liu, Heng Jui

AU - Chang, Kao Der

AU - Chou, Wu Ching

AU - Wu, Chung Lin

AU - Chen, Yi Chun

AU - Luo, Chih Wei

AU - Hsu, Yung Jung

AU - Chu, Ying Hao

PY - 2015/7/1

Y1 - 2015/7/1

N2 - 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.

AB - 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.

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Heteroepitaxial approach to explore charge dynamics across Au/BiVO₄ interface for photoactivity enhancement

Abstract

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