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Vacuum-annealing induces sub-surface redox-states in surfactant-structured alpha-Fe2O3 photoanodes prepared by ink-jet printing

Vacuum-annealing induces sub-surface redox-states in surfactant-structured alpha-Fe2O3 photoanodes prepared by ink-jet printing
Vacuum-annealing induces sub-surface redox-states in surfactant-structured alpha-Fe2O3 photoanodes prepared by ink-jet printing
textcopyright 2017 Elsevier B.V. Transparent nano-structured hematite ($-Fe 2 O 3 ) films of approximately 550 nm thickness on tin-doped indium oxide (ITO) have been obtained conveniently by ink-jet printing of a Fe(NO 3 ) 3 /Brij textregistered O10 precursor ink and subsequent annealing at 500 °C in air. When illuminated with a blue LED ($ = 455 nm, ca. 100 mW cm −2 ), the hematite films exhibited photocurrents of up to 70 $A cm −2 at 0.4 V vs. SCE in 0.1 M NaOH electrolyte. Thermal annealing in vacuum at 500 °C for 2 h increased photocurrents more than three times to 230 $A cm −2 in agreement with previous literature reports for pure hematite materials. These results suggest that a simple ink-jetting process with surfactants is viable. The effects of vacuum-annealing on the photoelectrical properties of $-Fe 2 O 3 films are discussed in terms of a sub-surface state templating hypothesis based on data gathered from photo-transients, field emission scanning electron microscopy, X-ray photoelectron spectroscopy analysis, X-ray diffraction, photocurrent spectra, and cyclic voltammetry.
Hematite films,Oxygen evolution,Photoanode,Solar energy,Water splitting
0926-3373
289-295
Bondarchuk, A.N.
4e8cfd29-e2b6-4bc1-87d8-2c5943c8be9e
Peter, L.M.
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Kissling, G.P.
b9ad7a6b-70b9-48b6-ac03-a189278dd2d9
Madrid, E.
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Aguilar-Martínez, J.A.
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Rymansaib, Z.
5bf3ea4d-1661-4c18-b472-8496d788019d
Iravani, P.
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Gromboni, M.
f00daf42-926e-43c1-9dc2-748eb36025a8
Mascaro, L.H.
7a4183fc-076f-4629-ace7-33837ff0b5ed
Walsh, A.
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Marken, F.
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Bondarchuk, A.N.
4e8cfd29-e2b6-4bc1-87d8-2c5943c8be9e
Peter, L.M.
6dcea252-e143-4044-b692-bacd6af2db3e
Kissling, G.P.
b9ad7a6b-70b9-48b6-ac03-a189278dd2d9
Madrid, E.
9f474148-626f-474d-a2a7-646600ac2381
Aguilar-Martínez, J.A.
6685f2f3-8536-4cd0-90ab-e06a46e724ce
Rymansaib, Z.
5bf3ea4d-1661-4c18-b472-8496d788019d
Iravani, P.
921fccad-d763-4010-b76e-9aff7aa84d38
Gromboni, M.
f00daf42-926e-43c1-9dc2-748eb36025a8
Mascaro, L.H.
7a4183fc-076f-4629-ace7-33837ff0b5ed
Walsh, A.
86de9a7d-90f1-4a57-bf4d-bb9b343407c9
Marken, F.
123dfff8-7d86-4b65-96ca-751b417e5192

Bondarchuk, A.N., Peter, L.M., Kissling, G.P., Madrid, E., Aguilar-Martínez, J.A., Rymansaib, Z., Iravani, P., Gromboni, M., Mascaro, L.H., Walsh, A. and Marken, F. (2017) Vacuum-annealing induces sub-surface redox-states in surfactant-structured alpha-Fe2O3 photoanodes prepared by ink-jet printing. Applied Catalysis B Environmental, 211, 289-295. (doi:10.1016/j.apcatb.2017.04.047).

Record type: Article

Abstract

textcopyright 2017 Elsevier B.V. Transparent nano-structured hematite ($-Fe 2 O 3 ) films of approximately 550 nm thickness on tin-doped indium oxide (ITO) have been obtained conveniently by ink-jet printing of a Fe(NO 3 ) 3 /Brij textregistered O10 precursor ink and subsequent annealing at 500 °C in air. When illuminated with a blue LED ($ = 455 nm, ca. 100 mW cm −2 ), the hematite films exhibited photocurrents of up to 70 $A cm −2 at 0.4 V vs. SCE in 0.1 M NaOH electrolyte. Thermal annealing in vacuum at 500 °C for 2 h increased photocurrents more than three times to 230 $A cm −2 in agreement with previous literature reports for pure hematite materials. These results suggest that a simple ink-jetting process with surfactants is viable. The effects of vacuum-annealing on the photoelectrical properties of $-Fe 2 O 3 films are discussed in terms of a sub-surface state templating hypothesis based on data gathered from photo-transients, field emission scanning electron microscopy, X-ray photoelectron spectroscopy analysis, X-ray diffraction, photocurrent spectra, and cyclic voltammetry.

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Accepted/In Press date: 18 April 2017
e-pub ahead of print date: 21 April 2017
Keywords: Hematite films,Oxygen evolution,Photoanode,Solar energy,Water splitting

Identifiers

Local EPrints ID: 422010
URI: http://eprints.soton.ac.uk/id/eprint/422010
ISSN: 0926-3373
PURE UUID: 10c065fa-0e5c-42fa-b77e-69b90c2a417b
ORCID for G.P. Kissling: ORCID iD orcid.org/0000-0003-4701-7160

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Date deposited: 12 Jul 2018 16:31
Last modified: 17 Dec 2019 02:09

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Contributors

Author: A.N. Bondarchuk
Author: L.M. Peter
Author: G.P. Kissling ORCID iD
Author: E. Madrid
Author: J.A. Aguilar-Martínez
Author: Z. Rymansaib
Author: P. Iravani
Author: M. Gromboni
Author: L.H. Mascaro
Author: A. Walsh
Author: F. Marken

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