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Heterojunction α-Fe2O3/ZnO films with enhanced photocatalytic properties grown by aerosol-assisted chemical vapour deposition.

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Title: Heterojunction α-Fe2O3/ZnO films with enhanced photocatalytic properties grown by aerosol-assisted chemical vapour deposition.
Authors: Jiamprasertboon, A
Kafizas, A
Sachs, M
Ling, M
Alotaibi, AM
Lu, Y
Sirithanon, T
Parkin, IP
Carmalt, CJ
Item Type: Journal Article
Abstract: Type-I heterojunction films of α-Fe2O3/ZnO are reported herein as a non-titania based photocatalyst that shows remarkable enhancement in the photocatalytic properties towards stearic acid degradation under UVA light exposure (λ = 365 nm), with a quantum efficiency of ξ = 4.42 ± 1.54 × 10-4 molecules degraded/photon, which was about 16 times greater than that of α-Fe2O3, and 2.5 times greater than that of ZnO. As the degradation of stearic acid requires 104 electron transfers for each molecule, this represents an overall quantum efficiency of 4.60% for the α-Fe2O3/ZnO heterojunction. Time-resolved transient absorption spectroscopy (TAS) revealed the charge carrier behavior responsible for this increase in activity. Photogenerated electrons, formed in the ZnO layer, were transferred into the α-Fe2O3 layer on the pre-µs timescale, which reduced electron-hole recombination. This increased the lifetime of photogenerated holes formed in ZnO that oxidise stearic acid. The heterojunction α-Fe2O3/ZnO films grown herein show potential environmental applications as coatings for self-cleaning windows and surfaces.
Issue Date: 27-Aug-2019
Date of Acceptance: 25-Jun-2019
URI: http://hdl.handle.net/10044/1/71693
DOI: 10.1002/chem.201902175
ISSN: 0947-6539
Publisher: Wiley
Start Page: 11337
End Page: 11345
Journal / Book Title: Chemistry - A European Journal
Volume: 25
Issue: 48
Copyright Statement: © 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Jiamprasertboon, A. , Kafizas, A. , Sachs, M. , Ling, M. , Alotaibi, A. ., Lu, Y. , Sirithanon, T. , Parkin, I. . and Carmalt, C. . (2019), Heterojunction α‐Fe2O3/ZnO films with enhanced photocatalytic properties grown by aerosol‐assisted chemical vapour deposition. Chem. Eur. J.. Accepted Author Manuscript. doi:10.1002/chem.201902175, which has been published in final form at https://doi.org/10.1002/chem.201902175. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Sponsor/Funder: The Royal Society
Engineering and Physical Sciences Research Council
Funder's Grant Number: RSG\R1\180434
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry
aerosol-assisted CVD
films
hematite
heterojunctions
photocatalysis
TRANSIENT ABSORPTION-SPECTROSCOPY
OXIDE THIN-FILMS
HEMATITE PHOTOANODES
PHOTOGENERATED HOLES
WATER
SURFACE
TIO2
RECOMBINATION
DYNAMICS
ANATASE
aerosol-assisted CVD
films
hematite
heterojunctions
photocatalysis
Aerosol-Assisted CVD
Films
Hematite
Heterojunctions
photocatalysis
General Chemistry
03 Chemical Sciences
Publication Status: Published
Conference Place: Germany
Embargo Date: 2020-08-01
Online Publication Date: 2019-08-01
Appears in Collections:Chemistry
Centre for Environmental Policy
Faculty of Natural Sciences



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