Jiamprasertboon, A;
Kafizas, A;
Sachs, M;
Ling, M;
Alotaibi, AM;
Lu, Y;
Siritanon, T;
... Carmalt, CJ; + view all
(2019)
Heterojunction α‐Fe₂O₃/ZnO Films with Enhanced Photocatalytic Properties Grown by Aerosol‐Assisted Chemical Vapour Deposition.
Chemistry
, 25
(48)
pp. 1337-13345.
10.1002/chem.201902175.
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Manuscript Fe2O3-ZnO HJ _Chem Eur J_revised.pdf - Accepted Version Download (2MB) | Preview |
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Abstract
Type I heterojunction films of α-Fe2 O3 /ZnO are reported here as a non-titania based photocatalyst, which 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-Fe2 O3 , and 2.5 times greater than that of ZnO. Considering that the degradation of stearic acid requires 104 electron transfers for each molecule, this represents an overall quantum efficiency of 4.60 % for the α-Fe2 O3 /ZnO heterojunction. Time-resolved transient absorption spectroscopy (TAS) revealed the charge-carrier behaviour responsible for this increase in activity. Photogenerated electrons, formed in the ZnO layer, were transferred into the α-Fe2 O3 layer on the pre-μs timescale, which reduced electron-hole recombination. This increased the lifetime of photogenerated holes formed in ZnO, which oxidise stearic acid. The heterojunction α-Fe2 O3 /ZnO films grown herein show potential environmental applications as coatings for self-cleaning windows and surfaces.
| Type: | Article |
|---|---|
| Title: | Heterojunction α‐Fe₂O₃/ZnO Films with Enhanced Photocatalytic Properties Grown by Aerosol‐Assisted Chemical Vapour Deposition |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/chem.201902175 |
| Publisher version: | https://doi.org/10.1002/chem.201902175 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | aerosol-assisted CVD, films, hematite, heterojunctions, photocatalysis |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10080039 |
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