Universität zu Köln

Barreca, Davide ORCID: 0000-0002-8779-3386, Carraro, Giorgio ORCID: 0000-0002-3771-8548, Gasparotto, Alberto ORCID: 0000-0003-4626-651X, Maccato, Chiara ORCID: 0000-0001-6368-5754, Sada, Cinzia ORCID: 0000-0002-7607-0481, Singh, Aadesh P., Mathur, Sanjay, Mettenboerger, Andreas, Bontempi, Elza ORCID: 0000-0003-1656-7506 and Depero, Laura E. (2013). Columnar Fe2O3 arrays via plasma-enhanced growth: Interplay of fluorine substitution and photoelectrochemical properties. Int. J. Hydrog. Energy, 38 (33). S. 14189 - 14200. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1879-3487

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Abstract

A single-step plasma enhanced-chemical vapor deposition (PE-CVD) route for the synthesis of F-doped iron(III) oxide nanomaterials is presented. Growth experiments, performed from a fluorinated Fe(II) beta-diketonate precursor on Indium Tin Oxide (ITO) between 200 and 400 degrees C, yielded columnar beta-Fe2O3 arrays with a preferential (100) growth direction. The fluorine content in the deposits could be adjusted by the sole variation of the deposition temperature controlling, in turn, the optical absorption and energy bandgap. Photocurrent measurements and Mott-Schottky analyses, carried out in Na2SO4 solution under one sun illumination, evidenced a conductivity switch from n- to p-type upon increasing fluorine amount in the obtained nanomaterials. The sample photocurrent density, donor content and flatband potential support the hypothesis that a progressive substitution of oxygen by fluorine in the iron(III) oxide lattice can alter electronic structure and extend charge carrier lifetimes, making anion-doped beta-Fe2O3 an efficient water oxidation catalyst. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Barreca, Davide UNSPECIFIED orcid.org/0000-0002-8779-3386 UNSPECIFIED Carraro, Giorgio UNSPECIFIED orcid.org/0000-0002-3771-8548 UNSPECIFIED Gasparotto, Alberto UNSPECIFIED orcid.org/0000-0003-4626-651X UNSPECIFIED Maccato, Chiara UNSPECIFIED orcid.org/0000-0001-6368-5754 UNSPECIFIED Sada, Cinzia UNSPECIFIED orcid.org/0000-0002-7607-0481 UNSPECIFIED Singh, Aadesh P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED Mettenboerger, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Bontempi, Elza UNSPECIFIED orcid.org/0000-0003-1656-7506 UNSPECIFIED Depero, Laura E. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-472166
DOI:	10.1016/j.ijhydene.2013.08.119
Journal or Publication Title:	Int. J. Hydrog. Energy
Volume:	38
Number:	33
Page Range:	S. 14189 - 14200
Date:	2013
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1879-3487
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language THIN-FILMS; WATER OXIDATION; IRON-OXIDE; NANOSTRUCTURED HEMATITE; NANOMATERIALS; PHOTOANODES; PERFORMANCE; GENERATION; DEPOSITION Multiple languages Chemistry, Physical; Electrochemistry; Energy & Fuels Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47216