Improvement of sol-gel prepared tungsten trioxide photoanodes upon doping with ytterbium

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Title: Improvement of sol-gel prepared tungsten trioxide photoanodes upon doping with ytterbium
Authors: Díaz-García, Ana Korina | Gómez, Roberto
Research Group/s: Grupo de Fotoquímica y Electroquímica de Semiconductores (GFES)
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Photoelectrochemical | Tungsten trioxide | Water splitting | Ytterbium doping
Knowledge Area: Química Física
Issue Date: 8-Mar-2018
Publisher: Elsevier
Citation: Journal of Photochemistry and Photobiology A: Chemistry. 2018. doi:10.1016/j.jphotochem.2018.03.008
Abstract: The development of efficient and stable photoelectrodes keeps on being critical in the implementation of practical water splitting devices. Sol-gel synthesized tungsten trioxide thin film electrodes modified with ytterbium have been prepared on conducting glass substrates. All the obtained electrodes were found to be composed of monoclinic WO3, which is the photoactive crystal phase of WO3 for water oxidation. The photoelectrochemical behavior of both WO3 and WO3:Yb nanostructured electrodes in 0.1 M HClO4 is apparently characterized by a low degree of recombination. Ytterbium addition to tungsten trioxide improves its photoelectrochemical response as larger photocurrents are obtained without a significant change of the onset potential. This behavior is attributed primarily to a surface effect rather than to bulk doping. The addition of H2O2 to the aqueous electrolyte gives rise to both an increment in photocurrent and a shift of the photocurrent onset potential toward less positive values, which can be linked to the fact that hydrogen peroxide acts as an efficient hole scavenger. The implications of these findings in the mechanism of water photooxidation on WO3 are discussed.
Sponsor: Financial support of the Spanish Ministry of Economy and Competitiveness through project MAT2015-71727-R (FONDOS-FEDER) is gratefully acknowledged. A. K. D.-G. thanks the Mexican government (CONACyT) for the award of a doctoral grant.
ISSN: 1010-6030 (Print) | 1873-2666 (Online)
DOI: 10.1016/j.jphotochem.2018.03.008
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 Elsevier B.V.
Peer Review: si
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Appears in Collections:INV - GFES - Artículos de Revistas

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