Universität zu Köln

Singh, Trilok ORCID: 0000-0003-2322-7403, Mueller, Ralf, Singh, Jai and Mathur, Sanjay (2015). Tailoring surface states in WO3 photoanodes for efficient photoelectrochemical water splitting. Appl. Surf. Sci., 347. S. 448 - 454. AMSTERDAM: ELSEVIER. ISSN 1873-5584

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Abstract

The dynamics of photo-induced charge carriers are significantly influenced by the surface states of WO3 thin films, which were synthesized by reactive sputtering of tungsten substrates in oxygen plasma. Tailoring the surface properties by (i) hydrogen plasma treatment and (ii) anchoring plasmonic nanoparticles (Au and Ag) altered the light harvesting and charge separation/transport processes of WO3 photoanodes. Upon hydrogen plasma-treatment and coating of noble metal clusters, WO3 films showed enhanced visible light absorption and consequently higher photocurrent density (1.4 mA cm(-2)) compared to pristine WO3 (0.2 mA cm(-2)). Enhancement in hydrogen treated WO3 sample was found to be due to the reduction of W(VI) into W(V) centers, which produced substoichiometric WO3-x phases, whereas noble metal particles contributed towards both resonant and non-resonant scattering of incident light thereby increasing photon-to-current conversion efficiency. (C) 2015 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Singh, Trilok UNSPECIFIED orcid.org/0000-0003-2322-7403 UNSPECIFIED Mueller, Ralf UNSPECIFIED UNSPECIFIED UNSPECIFIED Singh, Jai UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-396138
DOI:	10.1016/j.apsusc.2015.04.126
Journal or Publication Title:	Appl. Surf. Sci.
Volume:	347
Page Range:	S. 448 - 454
Date:	2015
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1873-5584
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 TUNGSTEN TRIOXIDE; THIN-FILMS; OXIDE; SOLAR; PHOTOELECTROLYSIS Multiple languages Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/39613