Ultrathin hematite films deposited layer-by-layer on TiO2 underlayer for efficient water splitting under visible light

Zhang, Chuangli, Wu, Quanping, Ke, Xuebin, Wang, Juan, Jin, Xingming, & Xue, Song (2014) Ultrathin hematite films deposited layer-by-layer on TiO2 underlayer for efficient water splitting under visible light. International Journal of Hydrogen Energy, 39(27), pp. 14604-14612.

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Abstract

Ultrathin hematite (α-Fe2O3) film deposited on a TiO2 underlayer as a photoanode for photoelectrochemical water splitting was described. The TiO2 underlayer was coated on conductive fluorine-doped tin oxide (FTO) glass by spin coating. The hematite films were formed layer-by-layer by repeating the separated two-phase hydrolysis-solvothermal reaction of iron(III) acetylacetonate and aqueous ammonia. A photocurrent density of 0.683 mA cm−2 at +1.5 V vs. RHE (reversible hydrogen electrode) was obtained under visible light (>420 nm, 100 mW cm−2) illumination. The TiO2 underlayer plays an important role in the formation of hematite film, acting as an intermediary to alleviate the dead layer effect and as a support of large surface areas to coat greater amounts of Fe2O3. The as-prepared photoanodes are notably stable and highly efficient for photoelectrochemical water splitting under visible light. This study provides a facile synthesis process for the controlled production of highly active ultrathin hematite film and a simple route for photocurrent enhancement using several photoanodes in tandem.

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ID Code: 76085
Item Type: Journal Article
Refereed: Yes
Keywords: Hematite film, TiO2 underlayer, photoelectrochemical water splitting, visible light
DOI: 10.1016/j.ijhydene.2014.07.120
ISSN: 0360-3199
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Electrochemistry (030604)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CHEMICAL ENGINEERING (090400) > Catalytic Process Engineering (090402)
Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > NANOTECHNOLOGY (100700) > Nanomaterials (100708)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Elsevier
Copyright Statement: This is the author’s version of a work that was accepted for publication in International Journal of Hydrogen Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Hydrogen Energy, [VOL 36, ISSUE 27, (2014)] DOI: 10.1016/j.ijhydene.2014.07.120
Deposited On: 09 Sep 2014 22:45
Last Modified: 02 Oct 2016 16:52

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