Electrochemical Doping as a Way to Enhance Water Photooxidation on Nanostructured Nickel Titanate and Anatase Electrodes

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Title: Electrochemical Doping as a Way to Enhance Water Photooxidation on Nanostructured Nickel Titanate and Anatase Electrodes
Authors: Díez García, María Isabel | Monllor Satoca, Damián | Vinoth, Victor | Anandan, Sambandam | Lana-Villarreal, Teresa
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: Nickel titanate | Anatase | Electrochemical doping | Photoelectrochemistry | Water splitting
Knowledge Area: Química Física
Issue Date: Jun-2017
Publisher: Wiley-VCH Verlag GmbH & Co. KGaA
Citation: ChemElectroChem. 2017, 4(6): 1429-1435. doi:10.1002/celc.201700039
Abstract: A number of metal oxides have been proposed as useful materials for the photoelectrochemical (PEC) production of hydrogen from water. However, up to now, an ideal standalone material has not been found. We have investigated the possible use of nickel titanate (NiTiO3) nanorods as a photoanode. Although these electrodes absorb visible light, they show a modest PEC behavior. Interestingly, the photocurrent for water oxidation undergoes a 30-fold enhancement after an optimized reductive electrochemical pretreatment. Here, the induced doping is studied and compared with the corresponding for anatase nanoporous electrodes. The results reveal the key role of the electrolyte pH as well as the size of the electrode building blocks. The photocurrent promotion upon the electrochemical pretreatment can be ascribed to an enhanced charge transport linked to the ability of proton insertion in the crystal structure.
Sponsor: We are grateful to the Spanish Ministry of Economy and Competitiveness (MINECO) for financial support through projects PRI-PIBIN-2011-0816, MAT2012-37676 and MAT2015-71727-R (co-financed with FEDER funds by the European Union). S.A. also thanks DST, New Delhi, for the sanction of an India–Spain collaborative research grant (DST/INT/Spain/P-37/11 dt.16th Dec 2011). D.M.-S. acknowledges MINECO for financial support through project MAT2014-59961-C2-2-R, and the Spanish Ministry of Education and Science for the award of an FPI Fellowship (BES-2004-5194).
URI: http://hdl.handle.net/10045/67482
ISSN: 2196-0216
DOI: 10.1002/celc.201700039
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Peer Review: si
Publisher version: http://dx.doi.org/10.1002/celc.201700039
Appears in Collections:INV - GFES - Artículos de Revistas

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