Self-Assembled BiFeO3-ε-Fe2O3 Vertical Heteroepitaxy for Visible Light Photoelectrochemistry

Le Thi Quynh, Chien Nguyen Van, Yugandhar Bitla, Jhih Wei Chen, Thi Hien Do, Wen Yen Tzeng, Sheng Chieh Liao, Kai An Tsai, Yi Chun Chen, Chun Lin Wu, Chih Huang Lai, Chih Wei Luo, Yung Jung Hsu, Ying Hao Chu

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Self-assembled vertical heterostructure with a high interface-to-volume ratio offers tremendous opportunities to realize intriguing properties and advanced modulation of functionalities. Here, a heterostructure composed of two visible-light photocatalysts, BiFeO3 (BFO) and ε-Fe2O3 (ε-FO), is designed to investigate its photoelectrochemical performance. The structural characterization of the BFO-FO heterostructures confirms the phase separation with BFO nanopillars embedded in the ε-FO matrix. The investigation of band structure of the heterojunction suggests the assistance of photoexcited carrier separation, leading to an enhanced photoelectrochemical performance. The insights into the charge separation are further revealed by means of ultrafast dynamics and electrochemical impedance spectroscopies. This work shows a delicate design of the self-assembled vertical heteroepitaxy by taking advantage of the intimate contact between two phases that can lead to a tunable charge interaction, providing a new configuration for the optimization of photoelectrochemical cell.

Original languageEnglish
Article number1600686
JournalAdvanced Energy Materials
Volume6
Issue number18
DOIs
Publication statusPublished - 2016 Sep 21

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Epitaxial growth
Heterojunctions
Photoelectrochemical cells
Photocatalysts
Electrochemical impedance spectroscopy
Phase separation
Band structure
Modulation

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Quynh, Le Thi ; Van, Chien Nguyen ; Bitla, Yugandhar ; Chen, Jhih Wei ; Do, Thi Hien ; Tzeng, Wen Yen ; Liao, Sheng Chieh ; Tsai, Kai An ; Chen, Yi Chun ; Wu, Chun Lin ; Lai, Chih Huang ; Luo, Chih Wei ; Hsu, Yung Jung ; Chu, Ying Hao. / Self-Assembled BiFeO3-ε-Fe2O3 Vertical Heteroepitaxy for Visible Light Photoelectrochemistry. In: Advanced Energy Materials. 2016 ; Vol. 6, No. 18.
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abstract = "Self-assembled vertical heterostructure with a high interface-to-volume ratio offers tremendous opportunities to realize intriguing properties and advanced modulation of functionalities. Here, a heterostructure composed of two visible-light photocatalysts, BiFeO3 (BFO) and ε-Fe2O3 (ε-FO), is designed to investigate its photoelectrochemical performance. The structural characterization of the BFO-FO heterostructures confirms the phase separation with BFO nanopillars embedded in the ε-FO matrix. The investigation of band structure of the heterojunction suggests the assistance of photoexcited carrier separation, leading to an enhanced photoelectrochemical performance. The insights into the charge separation are further revealed by means of ultrafast dynamics and electrochemical impedance spectroscopies. This work shows a delicate design of the self-assembled vertical heteroepitaxy by taking advantage of the intimate contact between two phases that can lead to a tunable charge interaction, providing a new configuration for the optimization of photoelectrochemical cell.",
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Quynh, LT, Van, CN, Bitla, Y, Chen, JW, Do, TH, Tzeng, WY, Liao, SC, Tsai, KA, Chen, YC, Wu, CL, Lai, CH, Luo, CW, Hsu, YJ & Chu, YH 2016, 'Self-Assembled BiFeO3-ε-Fe2O3 Vertical Heteroepitaxy for Visible Light Photoelectrochemistry', Advanced Energy Materials, vol. 6, no. 18, 1600686. https://doi.org/10.1002/aenm.201600686

Self-Assembled BiFeO3-ε-Fe2O3 Vertical Heteroepitaxy for Visible Light Photoelectrochemistry. / Quynh, Le Thi; Van, Chien Nguyen; Bitla, Yugandhar; Chen, Jhih Wei; Do, Thi Hien; Tzeng, Wen Yen; Liao, Sheng Chieh; Tsai, Kai An; Chen, Yi Chun; Wu, Chun Lin; Lai, Chih Huang; Luo, Chih Wei; Hsu, Yung Jung; Chu, Ying Hao.

In: Advanced Energy Materials, Vol. 6, No. 18, 1600686, 21.09.2016.

Research output: Contribution to journalArticle

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T1 - Self-Assembled BiFeO3-ε-Fe2O3 Vertical Heteroepitaxy for Visible Light Photoelectrochemistry

AU - Quynh, Le Thi

AU - Van, Chien Nguyen

AU - Bitla, Yugandhar

AU - Chen, Jhih Wei

AU - Do, Thi Hien

AU - Tzeng, Wen Yen

AU - Liao, Sheng Chieh

AU - Tsai, Kai An

AU - Chen, Yi Chun

AU - Wu, Chun Lin

AU - Lai, Chih Huang

AU - Luo, Chih Wei

AU - Hsu, Yung Jung

AU - Chu, Ying Hao

PY - 2016/9/21

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N2 - Self-assembled vertical heterostructure with a high interface-to-volume ratio offers tremendous opportunities to realize intriguing properties and advanced modulation of functionalities. Here, a heterostructure composed of two visible-light photocatalysts, BiFeO3 (BFO) and ε-Fe2O3 (ε-FO), is designed to investigate its photoelectrochemical performance. The structural characterization of the BFO-FO heterostructures confirms the phase separation with BFO nanopillars embedded in the ε-FO matrix. The investigation of band structure of the heterojunction suggests the assistance of photoexcited carrier separation, leading to an enhanced photoelectrochemical performance. The insights into the charge separation are further revealed by means of ultrafast dynamics and electrochemical impedance spectroscopies. This work shows a delicate design of the self-assembled vertical heteroepitaxy by taking advantage of the intimate contact between two phases that can lead to a tunable charge interaction, providing a new configuration for the optimization of photoelectrochemical cell.

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