Metal Doping to Enhance the Photoelectrochemical Behavior of LaFeO3 Photocathodes

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Title: Metal Doping to Enhance the Photoelectrochemical Behavior of LaFeO3 Photocathodes
Authors: Díez García, María Isabel | 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: Doping | Lanthanum | Photochemistry | Perovskite phases | Water splitting
Knowledge Area: Química Física
Issue Date: 9-Jun-2017
Publisher: Wiley-VCH Verlag GmbH & Co. KGaA
Citation: ChemSusChem. 2017, 10(11): 2457-2463. doi:10.1002/cssc.201700166
Abstract: The development of tandem devices for water photosplitting requires the preparation of photocathodic materials based on earth-abundant elements that show long-term stability in aqueous electrolytes. Ternary metal oxides seem to be a viable option, among which perovskites stand out. In this context, transparent and compact LaFeO3 thin-film electrodes have been prepared by a sol–gel process, both undoped and doped with metals (M) such as Mg or Zn. Pristine electrodes support the development of cathodic photocurrents in 0.1 m NaOH aqueous solutions, particularly in the presence of oxygen, with an onset potential as high as 1.4 V versus the reversible hydrogen electrode. Doping with Mg or Zn leads to an important enhancement of the photocurrent, which peaks for a stoichiometry of LaFe0.95M0.05O3 with a sixfold enhancement with respect to the pristine material. Such an improvement is attributed to an increase in both the density and mobility of the majority carriers, although a contribution of surface passivation cannot be excluded.
Sponsor: Financial support from the Spanish Ministry of Economy and Competitiveness through project MAT2015-71727-R (FONDOS FEDER) is gratefully acknowledged.
ISSN: 1864-5631 (Print) | 1864-564X (Online)
DOI: 10.1002/cssc.201700166
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Peer Review: si
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Appears in Collections:INV - GFES - Artículos de Revistas

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