Universität zu Köln

Mettenboerger, Andreas, Singh, Trilok ORCID: 0000-0003-2322-7403, Singh, Aadesh P., Jaervi, Tommi T., Moseler, Michael, Valldor, Martin and Mathur, Sanjay (2014). Plasma-chemical reduction of iron oxide photoanodes for efficient solar hydrogen production. Int. J. Hydrog. Energy, 39 (10). S. 4828 - 4836. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1879-3487

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Abstract

We demonstrate the effect of hydrogen plasma treatment on hematite films as a simple and effective strategy for modifying the existing substrate to improve significantly the band edge positions and photoelectrochemical (PEC) performance. Plasma treated hematite films were consist of mixed phases (Fe3O4:alpha-Fe2O3) which was confirmed by XPS and Raman analysis, treated films also showed higher absorption cross-section and were found to be a promising photoelectrode material. The treated samples showed enhance photocurrent densities with maximum of 3.5 mA/cm(2) at 1.8 V/RHE and the photocurrent onset potentials were shifted from 1.68 VRHE (untreated) to 1.28 VRHE (treated). Hydrogen plasma treatment under non-equilibrium conditions induced a valence dynamics among Fe centers in the sub-surface region that was sustained by the incorporation of hydrogen in the hematite lattice as supported by the density functional theory calculations. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mettenboerger, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Singh, Trilok UNSPECIFIED orcid.org/0000-0003-2322-7403 UNSPECIFIED Singh, Aadesh P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jaervi, Tommi T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moseler, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Valldor, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-443157
DOI:	10.1016/j.ijhydene.2014.01.080
Journal or Publication Title:	Int. J. Hydrog. Energy
Volume:	39
Number:	10
Page Range:	S. 4828 - 4836
Date:	2014
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1879-3487
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 THIN-FILMS; VISIBLE-LIGHT; WATER; GAAS; OXYGEN; NANOSTRUCTURES; ABSORPTION; OXIDATION; SILICON; GROWTH Multiple languages Chemistry, Physical; Electrochemistry; Energy & Fuels Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/44315