Improved charge separation efficiency of hematite photoanodes by coating an ultrathin p-type LaFeO3 overlayer

Tao Fang; Yongsheng Guo; Songhua Cai; Ningsi Zhang; Yingfei Hu; Shiying Zhang; Zhaosheng Li; Zhigang Zou

doi:10.1088/1361-6528/aa7fda

Improved charge separation efficiency of hematite photoanodes by coating an ultrathin p-type LaFeO₃ overlayer

Tao Fang, Yongsheng Guo, Songhua Cai, Ningsi Zhang, Yingfei Hu, Shiying Zhang, Zhaosheng Li, Zhigang Zou

Research output: Journal article publication › Journal article › Academic research › peer-review

10 Citations (Scopus)

Abstract

Many metal-oxide candidates for photoelectrochemical water splitting exhibit localized small polaron carrier conduction. Especially hematite (α-Fe₂O₃) photoanodes often suffer from low carrier mobility, which causes the serious bulk electron-hole recombination and greatly limits their PEC performances. In this study, the charge separation efficiency of hematite was enhanced greatly by coating an ultrathin p-type LaFeO₃ overlayer. Compared to the hematite photoanodes, the solar water splitting photocurrent of the Fe₂O₃/LaFeO₃ n-p junction exhibits a 90% increase at 1.23 V versus the reversible hydrogen electrode, due to enlarging the band bending and expanding the depletion layer.

Original language	English
Article number	394003
Journal	Nanotechnology
Volume	28
Issue number	39
DOIs	https://doi.org/10.1088/1361-6528/aa7fda
Publication status	Published - 7 Sept 2017
Externally published	Yes

Keywords

charge separation efficiency
hematite
LaFeO
photoanode
water splitting

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Mechanics of Materials
Mechanical Engineering
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

More information

10.1088/1361-6528/aa7fda

Cite this

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title = "Improved charge separation efficiency of hematite photoanodes by coating an ultrathin p-type LaFeO3 overlayer",

abstract = "Many metal-oxide candidates for photoelectrochemical water splitting exhibit localized small polaron carrier conduction. Especially hematite (α-Fe2O3) photoanodes often suffer from low carrier mobility, which causes the serious bulk electron-hole recombination and greatly limits their PEC performances. In this study, the charge separation efficiency of hematite was enhanced greatly by coating an ultrathin p-type LaFeO3 overlayer. Compared to the hematite photoanodes, the solar water splitting photocurrent of the Fe2O3/LaFeO3 n-p junction exhibits a 90% increase at 1.23 V versus the reversible hydrogen electrode, due to enlarging the band bending and expanding the depletion layer.",

keywords = "charge separation efficiency, hematite, LaFeO, photoanode, water splitting",

author = "Tao Fang and Yongsheng Guo and Songhua Cai and Ningsi Zhang and Yingfei Hu and Shiying Zhang and Zhaosheng Li and Zhigang Zou",

note = "Funding Information: This work is supported by the National Basic Research Program of China (973 Program, 2013CB632404), a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, the National Natural Science Foundation of China (Nos. 21073090 and U1663228), and the Open Research Fund of Hunan Key Laboratory of Applied Environmental Photocatalysis (ccsu-KF-1404), Changsha University. Publisher Copyright: {\textcopyright} 2017 IOP Publishing Ltd.",

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doi = "10.1088/1361-6528/aa7fda",

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T1 - Improved charge separation efficiency of hematite photoanodes by coating an ultrathin p-type LaFeO3 overlayer

AU - Fang, Tao

AU - Guo, Yongsheng

AU - Cai, Songhua

AU - Zhang, Ningsi

AU - Hu, Yingfei

AU - Zhang, Shiying

AU - Li, Zhaosheng

AU - Zou, Zhigang

N1 - Funding Information: This work is supported by the National Basic Research Program of China (973 Program, 2013CB632404), a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, the National Natural Science Foundation of China (Nos. 21073090 and U1663228), and the Open Research Fund of Hunan Key Laboratory of Applied Environmental Photocatalysis (ccsu-KF-1404), Changsha University. Publisher Copyright: © 2017 IOP Publishing Ltd.

PY - 2017/9/7

Y1 - 2017/9/7

N2 - Many metal-oxide candidates for photoelectrochemical water splitting exhibit localized small polaron carrier conduction. Especially hematite (α-Fe2O3) photoanodes often suffer from low carrier mobility, which causes the serious bulk electron-hole recombination and greatly limits their PEC performances. In this study, the charge separation efficiency of hematite was enhanced greatly by coating an ultrathin p-type LaFeO3 overlayer. Compared to the hematite photoanodes, the solar water splitting photocurrent of the Fe2O3/LaFeO3 n-p junction exhibits a 90% increase at 1.23 V versus the reversible hydrogen electrode, due to enlarging the band bending and expanding the depletion layer.

AB - Many metal-oxide candidates for photoelectrochemical water splitting exhibit localized small polaron carrier conduction. Especially hematite (α-Fe2O3) photoanodes often suffer from low carrier mobility, which causes the serious bulk electron-hole recombination and greatly limits their PEC performances. In this study, the charge separation efficiency of hematite was enhanced greatly by coating an ultrathin p-type LaFeO3 overlayer. Compared to the hematite photoanodes, the solar water splitting photocurrent of the Fe2O3/LaFeO3 n-p junction exhibits a 90% increase at 1.23 V versus the reversible hydrogen electrode, due to enlarging the band bending and expanding the depletion layer.

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