Universität zu Köln

Warwick, Michael E. A., Carraro, Giorgio ORCID: 0000-0002-3771-8548, Gasparotto, Alberto ORCID: 0000-0003-4626-651X, Maccato, Chiara ORCID: 0000-0001-6368-5754, Barreca, Davide ORCID: 0000-0002-8779-3386, Sada, Cinzia ORCID: 0000-0002-7607-0481, Bontempi, Elza ORCID: 0000-0003-1656-7506, Goenuellue, Yakup and Mathur, Sanjay (2015). Interplay of thickness and photoelectrochemical properties in nanostructured alpha-Fe2O3 thin films. Phys. Status Solidi A-Appl. Mat., 212 (7). S. 1501 - 1508. WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1862-6319

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Abstract

Nanostructured Fe2O3 thin films were grown by plasma enhanced-chemical vapor deposition (PE-CVD) from Ar/O-2 plasmas for photoelectrochemical (PEC) water splitting applications. Iron oxide coatings were deposited on fluorine-doped tin oxide (FTO) substrates at 300 degrees C under optimized conditions, and subsequently annealed ex situ in air at 650 degrees C. Structural and compositional analyses confirmed the formation of pure alpha-Fe2O3 (hematite), free from other crystalline iron oxide phases. Controlled variations of the deposition time enabled tuning of the thickness and nano-aggregate sizes in the resulting deposits and, correspondingly, their current-voltage characteristics. A maximum photocurrent density close to 1mAcm(-2) was achieved at 1.23V versus the reversible hydrogen electrode (RHE), without the need of any oxygen evolution catalyst or over/underlayer. The present findings revealed the key role played by the engineering of Fe2O3-based nanomaterials, resulting ultimately in a lowered carrier diffusion length, and in an optimal diffusion of tin from FTO into thinner layers. These features offer an amenable opportunity for harvesting radiant energy to trigger water photoelectrolysis and produce clean hydrogen in a carbonneutral fashion. (C) 2015 WILEY - VCH Verlag GmbH & Co. KGaA, Weinheim

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Warwick, Michael E. A. UNSPECIFIED UNSPECIFIED 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 Barreca, Davide UNSPECIFIED orcid.org/0000-0002-8779-3386 UNSPECIFIED Sada, Cinzia UNSPECIFIED orcid.org/0000-0002-7607-0481 UNSPECIFIED Bontempi, Elza UNSPECIFIED orcid.org/0000-0003-1656-7506 UNSPECIFIED Goenuellue, Yakup UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-400561
DOI:	10.1002/pssa.201532366
Journal or Publication Title:	Phys. Status Solidi A-Appl. Mat.
Volume:	212
Number:	7
Page Range:	S. 1501 - 1508
Date:	2015
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1862-6319
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HEMATITE NANOROD ARRAYS; WATER OXIDATION; IRON-OXIDE; PHOTOANODES; PERFORMANCE; NANOWIRES; TEMPERATURE; ELECTRODES; DEPOSITION; GROWTH Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/40056