Zn-Doped Fe2TiO5Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition

Miriam Regue; Ibbi Y. Ahmet; Prince Saurabh Bassi; Andrew L. Johnson; Sebastian Fiechter; Roel Van De Krol; Fatwa F. Abdi; Salvador Eslava

doi:10.1021/acsaem.0c02190

Zn-Doped Fe₂TiO₅Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition

Miriam Regue, Ibbi Y. Ahmet, Prince Saurabh Bassi, Andrew L. Johnson, Sebastian Fiechter, Roel Van De Krol, Fatwa F. Abdi, Salvador Eslava

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

25 Citations (SciVal)

106 Downloads (Pure)

Abstract

Water splitting in photoelectrochemical cells is a promising technology to produce solar hydrogen. Fe2TiO5 pseudobrookite with a bandgap of around 2 eV absorbs the predominant visible range of the solar spectrum and is emerging as a promising photoanode for such cells. Herein, we present Fe2TiO5 pseudobrookite-based films prepared by aerosol-assisted chemical vapor deposition and the positive impact of Zn2+ doping in their formation and performance. Undoped and Zn2+-doped Fe2TiO5 pseudobrookite-based photoanodes were characterized by techniques such as XRD, XPS, UPS, and Mott-Schottky analysis. We find that the Zn2+ ions are preferentially incorporated in the pseudobrookite phase over a present secondary hematite (α-Fe2O3) phase. The Zn2+ doping modifies the electronic properties of the films, increases their charge carrier concentration, and upshifts their Fermi level, significantly improving their anodic photocurrent response by a factor of three. In addition, charge transfer efficiency calculations reveal that Zn2+ doping improves both charge separation and injection efficiencies, overall demonstrating a promising approach for the design of enhanced pseudobrookite-based photoanodes.

Original language	English
Pages (from-to)	12066-12077
Number of pages	12
Journal	ACS Applied Energy Materials
Volume	3
Issue number	12
Early online date	20 Nov 2020
DOIs	https://doi.org/10.1021/acsaem.0c02190
Publication status	Published - 28 Dec 2020

Bibliographical note

Funding Information:
The authors would like to acknowledge both EPSRC for funding the Centre for Doctoral Training in Sustainable Chemical Technologies at the University of Bath (EP/L016354/1) and the Material and Chemical Characterisation facility (MC2) at the University of Bath. S.E. would like to acknowledge the financial support from an EPSRC Fellowship (EP/S030727/1).

Publisher Copyright:
© 2020 American Chemical Society.

Keywords

aerosol-assisted chemical vapor deposition
FeTiO
photoanode
photoelectrochemical
Zn doping

ASJC Scopus subject areas

Chemical Engineering (miscellaneous)
Energy Engineering and Power Technology
Electrochemistry
Materials Chemistry
Electrical and Electronic Engineering

UN SDGs

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

Access to Document

10.1021/acsaem.0c02190Licence: Unspecified

ae0c02190_si_001.PDF
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Applied Energy Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsaem.0c02190
Accepted author manuscript, 2.62 MB

Cite this

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title = "Zn-Doped Fe2TiO5Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition",

abstract = "Water splitting in photoelectrochemical cells is a promising technology to produce solar hydrogen. Fe2TiO5 pseudobrookite with a bandgap of around 2 eV absorbs the predominant visible range of the solar spectrum and is emerging as a promising photoanode for such cells. Herein, we present Fe2TiO5 pseudobrookite-based films prepared by aerosol-assisted chemical vapor deposition and the positive impact of Zn2+ doping in their formation and performance. Undoped and Zn2+-doped Fe2TiO5 pseudobrookite-based photoanodes were characterized by techniques such as XRD, XPS, UPS, and Mott-Schottky analysis. We find that the Zn2+ ions are preferentially incorporated in the pseudobrookite phase over a present secondary hematite (α-Fe2O3) phase. The Zn2+ doping modifies the electronic properties of the films, increases their charge carrier concentration, and upshifts their Fermi level, significantly improving their anodic photocurrent response by a factor of three. In addition, charge transfer efficiency calculations reveal that Zn2+ doping improves both charge separation and injection efficiencies, overall demonstrating a promising approach for the design of enhanced pseudobrookite-based photoanodes.",

keywords = "aerosol-assisted chemical vapor deposition, FeTiO, photoanode, photoelectrochemical, Zn doping",

author = "Miriam Regue and Ahmet, {Ibbi Y.} and Bassi, {Prince Saurabh} and Johnson, {Andrew L.} and Sebastian Fiechter and {Van De Krol}, Roel and Abdi, {Fatwa F.} and Salvador Eslava",

note = "Funding Information: The authors would like to acknowledge both EPSRC for funding the Centre for Doctoral Training in Sustainable Chemical Technologies at the University of Bath (EP/L016354/1) and the Material and Chemical Characterisation facility (MC2) at the University of Bath. S.E. would like to acknowledge the financial support from an EPSRC Fellowship (EP/S030727/1). Publisher Copyright: {\textcopyright} 2020 American Chemical Society.",

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month = dec,

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doi = "10.1021/acsaem.0c02190",

language = "English",

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AU - Regue, Miriam

AU - Ahmet, Ibbi Y.

AU - Bassi, Prince Saurabh

AU - Johnson, Andrew L.

AU - Fiechter, Sebastian

AU - Van De Krol, Roel

AU - Abdi, Fatwa F.

AU - Eslava, Salvador

N1 - Funding Information: The authors would like to acknowledge both EPSRC for funding the Centre for Doctoral Training in Sustainable Chemical Technologies at the University of Bath (EP/L016354/1) and the Material and Chemical Characterisation facility (MC2) at the University of Bath. S.E. would like to acknowledge the financial support from an EPSRC Fellowship (EP/S030727/1). Publisher Copyright: © 2020 American Chemical Society.

PY - 2020/12/28

Y1 - 2020/12/28

N2 - Water splitting in photoelectrochemical cells is a promising technology to produce solar hydrogen. Fe2TiO5 pseudobrookite with a bandgap of around 2 eV absorbs the predominant visible range of the solar spectrum and is emerging as a promising photoanode for such cells. Herein, we present Fe2TiO5 pseudobrookite-based films prepared by aerosol-assisted chemical vapor deposition and the positive impact of Zn2+ doping in their formation and performance. Undoped and Zn2+-doped Fe2TiO5 pseudobrookite-based photoanodes were characterized by techniques such as XRD, XPS, UPS, and Mott-Schottky analysis. We find that the Zn2+ ions are preferentially incorporated in the pseudobrookite phase over a present secondary hematite (α-Fe2O3) phase. The Zn2+ doping modifies the electronic properties of the films, increases their charge carrier concentration, and upshifts their Fermi level, significantly improving their anodic photocurrent response by a factor of three. In addition, charge transfer efficiency calculations reveal that Zn2+ doping improves both charge separation and injection efficiencies, overall demonstrating a promising approach for the design of enhanced pseudobrookite-based photoanodes.

AB - Water splitting in photoelectrochemical cells is a promising technology to produce solar hydrogen. Fe2TiO5 pseudobrookite with a bandgap of around 2 eV absorbs the predominant visible range of the solar spectrum and is emerging as a promising photoanode for such cells. Herein, we present Fe2TiO5 pseudobrookite-based films prepared by aerosol-assisted chemical vapor deposition and the positive impact of Zn2+ doping in their formation and performance. Undoped and Zn2+-doped Fe2TiO5 pseudobrookite-based photoanodes were characterized by techniques such as XRD, XPS, UPS, and Mott-Schottky analysis. We find that the Zn2+ ions are preferentially incorporated in the pseudobrookite phase over a present secondary hematite (α-Fe2O3) phase. The Zn2+ doping modifies the electronic properties of the films, increases their charge carrier concentration, and upshifts their Fermi level, significantly improving their anodic photocurrent response by a factor of three. In addition, charge transfer efficiency calculations reveal that Zn2+ doping improves both charge separation and injection efficiencies, overall demonstrating a promising approach for the design of enhanced pseudobrookite-based photoanodes.

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Zn-Doped Fe₂TiO₅Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

Access to Document

Other files and links

Fingerprint

Dataset for 'Zn doped Fe2TiO5 photoanodes grown by aerosol-assited chemical vapor deposition'

Raman confocal microscope RENISHAM INVIA

Cite this

Zn-Doped Fe2TiO5Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

Access to Document

Other files and links

Fingerprint

Datasets

Dataset for 'Zn doped Fe2TiO5 photoanodes grown by aerosol-assited chemical vapor deposition'

Equipment

Raman confocal microscope RENISHAM INVIA

Cite this

Zn-Doped Fe₂TiO₅Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition