Rapid fabrication of oxygen defective α-Fe2O3(110) for enhanced photoelectrochemical activities.

Mohamad Noh, MF; Ullah, H; Arzaee, NA; Ab Halim, A; Abdul Rahim, MAF; Mohamed, NA; Safaei, J; Mohd Nasir, SNF; Wang, G; Mat Teridi, MA

Rapid fabrication of oxygen defective α-Fe2O3(110) for enhanced photoelectrochemical activities.

Mohamad Noh, MF Ullah, H Arzaee, NA Ab Halim, A Abdul Rahim, MAF Mohamed, NA Safaei, J Mohd Nasir, SNF Wang, G

Mat Teridi, MA

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Publisher:: ROYAL SOC CHEMISTRY
Publication Type:: Journal Article
Citation:: Dalton transactions (Cambridge, England : 2003), 2020, 49, (34), pp. 12037-12048
Issue Date:: 2020-09

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Field	Value	Language
dc.contributor.author	Mohamad Noh, MF
dc.contributor.author	Ullah, H
dc.contributor.author	Arzaee, NA
dc.contributor.author	Ab Halim, A
dc.contributor.author	Abdul Rahim, MAF
dc.contributor.author	Mohamed, NA
dc.contributor.author	Safaei, J
dc.contributor.author	Mohd Nasir, SNF
dc.contributor.author	Wang, G https://orcid.org/0000-0003-4295-8578
dc.contributor.author	Mat Teridi, MA
dc.date.accessioned	2021-01-13T05:48:32Z
dc.date.available	2021-01-13T05:48:32Z
dc.date.issued	2020-09
dc.identifier.citation	Dalton transactions (Cambridge, England : 2003), 2020, 49, (34), pp. 12037-12048
dc.identifier.issn	1477-9226
dc.identifier.issn	1477-9234
dc.identifier.uri	http://hdl.handle.net/10453/145394
dc.description.abstract	Defect engineering is increasingly recognized as a viable strategy for boosting the performance of photoelectrochemical (PEC) water splitting using metal oxide-based photoelectrodes. However, previously developed methods for generating point defects associated with oxygen vacancies are rather time-consuming. Herein, high density oxygen deficient α-Fe2O3 with the dominant (110) crystal plane is developed in a very short timescale of 10 minutes by employing aerosol-assisted chemical vapor deposition and pure nitrogen as a gas carrier. The oxygen-defective film exhibits almost 8 times higher photocurrent density compared to a hematite photoanode with a low concentration of oxygen vacancies which is prepared in purified air. The existence of oxygen vacancies improves light absorption ability, accelerates charge transport in the bulk of films, and promotes charge separation at the electrolyte/semiconductor interface. DFT simulations verify that oxygen-defective hematite has a narrow bandgap, electron-hole trapped centre, and strong adsorption energy of water molecules compared to pristine hematite. This strategy might bring PEC technology another step further towards large-scale fabrication for future commercialization.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	ROYAL SOC CHEMISTRY
dc.relation.ispartof	Dalton transactions (Cambridge, England : 2003)
dc.relation.isbasedon	10.1039/d0dt00406e
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0302 Inorganic Chemistry, 0307 Theoretical and Computational Chemistry, 0399 Other Chemical Sciences
dc.subject.classification	Inorganic & Nuclear Chemistry
dc.title	Rapid fabrication of oxygen defective α-Fe2O3(110) for enhanced photoelectrochemical activities.
dc.type	Journal Article
utslib.citation.volume	49
utslib.location.activity	England
utslib.for	0302 Inorganic Chemistry
utslib.for	0307 Theoretical and Computational Chemistry
utslib.for	0399 Other Chemical Sciences
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2021-01-13T05:48:26Z
pubs.issue	34
pubs.publication-status	Published
pubs.volume	49
utslib.citation.issue	34

Abstract:

Defect engineering is increasingly recognized as a viable strategy for boosting the performance of photoelectrochemical (PEC) water splitting using metal oxide-based photoelectrodes. However, previously developed methods for generating point defects associated with oxygen vacancies are rather time-consuming. Herein, high density oxygen deficient α-Fe2O3 with the dominant (110) crystal plane is developed in a very short timescale of 10 minutes by employing aerosol-assisted chemical vapor deposition and pure nitrogen as a gas carrier. The oxygen-defective film exhibits almost 8 times higher photocurrent density compared to a hematite photoanode with a low concentration of oxygen vacancies which is prepared in purified air. The existence of oxygen vacancies improves light absorption ability, accelerates charge transport in the bulk of films, and promotes charge separation at the electrolyte/semiconductor interface. DFT simulations verify that oxygen-defective hematite has a narrow bandgap, electron-hole trapped centre, and strong adsorption energy of water molecules compared to pristine hematite. This strategy might bring PEC technology another step further towards large-scale fabrication for future commercialization.

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http://hdl.handle.net/10453/145394