Superior photoelectrochemical activity of self-assembled NiWO4-WO3 heteroepitaxy

Thi Hien Do; Chien Nguyen Van; Kai An Tsai; Le Thi Quynh; Jhih Wei Chen; Yan Cheng Lin; Yi Chun Chen; Wu Ching Chou; Chun Lin Wu; Yung Jung Hsu; Ying Hao Chu

doi:10.1016/j.nanoen.2016.03.021

Superior photoelectrochemical activity of self-assembled NiWO₄-WO₃ heteroepitaxy

Thi Hien Do, Chien Nguyen Van, Kai An Tsai, Le Thi Quynh, Jhih Wei Chen, Yan Cheng Lin, Yi Chun Chen, Wu Ching Chou, Chun Lin Wu, Yung Jung Hsu, Ying Hao Chu

Department of Physics

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

41 Citations (Scopus)

Abstract

Self-assembled nanocomposites with a high interface-to-volume ratio offer tremendous opportunities of tailoring functionalities by a proper combination of components. In this study, we report the first fabrication of self-assembled NiWO₄-WO₃ heteroepitaxy and its excellent performance on photoelectrochemical water splitting. The heteroepitaxy is evidenced by a combination of x-ray diffraction and transmission electron microscopy. The energy band diagram of NiWO₄-WO₃ heterostructure probed by x-ray photoelectron spectroscopy suggests an efficient charge separation at their interface by injecting photo-generated electrons from NiWO₄ to WO₃ and holes from WO₃ to NiWO₄. Therefore, a great improvement in the photoelectrochemical activity of self-assembled NiWO₄-WO₃ heteroepitaxy was achieved (1400 μA cm^-2 at 0.7 V vs. Ag/AgCl). This work delivers a new category of composite materials for promising photoelectrode in photoelectrochemical cells.

Original language	English
Pages (from-to)	153-160
Number of pages	8
Journal	Nano Energy
Volume	23
DOIs	https://doi.org/10.1016/j.nanoen.2016.03.021
Publication status	Published - 2016 May 1

All Science Journal Classification (ASJC) codes

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

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10.1016/j.nanoen.2016.03.021

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title = "Superior photoelectrochemical activity of self-assembled NiWO4-WO3 heteroepitaxy",

abstract = "Self-assembled nanocomposites with a high interface-to-volume ratio offer tremendous opportunities of tailoring functionalities by a proper combination of components. In this study, we report the first fabrication of self-assembled NiWO4-WO3 heteroepitaxy and its excellent performance on photoelectrochemical water splitting. The heteroepitaxy is evidenced by a combination of x-ray diffraction and transmission electron microscopy. The energy band diagram of NiWO4-WO3 heterostructure probed by x-ray photoelectron spectroscopy suggests an efficient charge separation at their interface by injecting photo-generated electrons from NiWO4 to WO3 and holes from WO3 to NiWO4. Therefore, a great improvement in the photoelectrochemical activity of self-assembled NiWO4-WO3 heteroepitaxy was achieved (1400 μA cm-2 at 0.7 V vs. Ag/AgCl). This work delivers a new category of composite materials for promising photoelectrode in photoelectrochemical cells.",

author = "Do, {Thi Hien} and {Nguyen Van}, Chien and Tsai, {Kai An} and Quynh, {Le Thi} and Chen, {Jhih Wei} and Lin, {Yan Cheng} and Chen, {Yi Chun} and Chou, {Wu Ching} and Wu, {Chun Lin} and Hsu, {Yung Jung} and Chu, {Ying Hao}",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd.",

year = "2016",

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doi = "10.1016/j.nanoen.2016.03.021",

language = "English",

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T1 - Superior photoelectrochemical activity of self-assembled NiWO4-WO3 heteroepitaxy

AU - Do, Thi Hien

AU - Nguyen Van, Chien

AU - Tsai, Kai An

AU - Quynh, Le Thi

AU - Chen, Jhih Wei

AU - Lin, Yan Cheng

AU - Chen, Yi Chun

AU - Chou, Wu Ching

AU - Wu, Chun Lin

AU - Hsu, Yung Jung

AU - Chu, Ying Hao

PY - 2016/5/1

Y1 - 2016/5/1

N2 - Self-assembled nanocomposites with a high interface-to-volume ratio offer tremendous opportunities of tailoring functionalities by a proper combination of components. In this study, we report the first fabrication of self-assembled NiWO4-WO3 heteroepitaxy and its excellent performance on photoelectrochemical water splitting. The heteroepitaxy is evidenced by a combination of x-ray diffraction and transmission electron microscopy. The energy band diagram of NiWO4-WO3 heterostructure probed by x-ray photoelectron spectroscopy suggests an efficient charge separation at their interface by injecting photo-generated electrons from NiWO4 to WO3 and holes from WO3 to NiWO4. Therefore, a great improvement in the photoelectrochemical activity of self-assembled NiWO4-WO3 heteroepitaxy was achieved (1400 μA cm-2 at 0.7 V vs. Ag/AgCl). This work delivers a new category of composite materials for promising photoelectrode in photoelectrochemical cells.

AB - Self-assembled nanocomposites with a high interface-to-volume ratio offer tremendous opportunities of tailoring functionalities by a proper combination of components. In this study, we report the first fabrication of self-assembled NiWO4-WO3 heteroepitaxy and its excellent performance on photoelectrochemical water splitting. The heteroepitaxy is evidenced by a combination of x-ray diffraction and transmission electron microscopy. The energy band diagram of NiWO4-WO3 heterostructure probed by x-ray photoelectron spectroscopy suggests an efficient charge separation at their interface by injecting photo-generated electrons from NiWO4 to WO3 and holes from WO3 to NiWO4. Therefore, a great improvement in the photoelectrochemical activity of self-assembled NiWO4-WO3 heteroepitaxy was achieved (1400 μA cm-2 at 0.7 V vs. Ag/AgCl). This work delivers a new category of composite materials for promising photoelectrode in photoelectrochemical cells.

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JO - Nano Energy

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Superior photoelectrochemical activity of self-assembled NiWO₄-WO₃ heteroepitaxy

Abstract

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