Lucas-Granados, B.; Sánchez Tovar, R.; Fernández Domene, RM.; Garcia-Anton, J. (2017). Controlled hydrodynamic conditions on the formation of iron oxide nanostructures synthesized by electrochemical anodization: Effect of the electrode rotation speed. Applied Surface Science. 392:503-513. https://doi.org/10.1016/j.apsusc.2016.09.073
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/151286
Title:
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Controlled hydrodynamic conditions on the formation of iron oxide nanostructures synthesized by electrochemical anodization: Effect of the electrode rotation speed
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Author:
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Lucas-Granados, Bianca
Sánchez Tovar, Rita
Fernández Domene, Ramón Manuel
Garcia-Anton, Jose
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UPV Unit:
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Universitat Politècnica de València. Departamento de Ingeniería Química y Nuclear - Departament d'Enginyeria Química i Nuclear
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Issued date:
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Abstract:
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[EN] Iron oxide nanostructures are of particular interest because they can be used as photocatalysts in water splitting due to their advantageous properties. Electrochemical anodization is one of the best techniques to ...[+]
[EN] Iron oxide nanostructures are of particular interest because they can be used as photocatalysts in water splitting due to their advantageous properties. Electrochemical anodization is one of the best techniques to synthesize nanostructures directly on the metal substrate (direct back contact). In the present study, a novel methodology consisting of the anodization of iron under hydrodynamic conditions is carried out in order to obtain mainly hematite (alpha-Fe2O3) nanostructures to be used as photocatalysts for photoelectrochemical water splitting applications. Different rotation speeds were studied with the aim of evaluating the obtained nanostructures and determining the most attractive operational conditions. The synthesized nanostructures were characterized by means of Raman spectroscopy, Field Emission Scanning Electron Microscopy, photoelectrochemical water splitting, stability against photocorrosion tests, Mott-Schottky analysis,. Electrochemical Impedance Spectroscopy (EIS) and band gap measurements. The results showed that the highest photocurrent densities for photoelectrochemical water splitting were achieved for the nanostructure synthesized at 1000 rpm which corresponds to a nanotubular structure reaching similar to 0.130 mA cm(-2) at 0.54V (vs. Ag/AgCl). This is in agreement with the EIS measurements and Mott-Schottky analysis which showed the lowest resistances and the corresponding donor density values, respectively, for the nanostructure anodized at 1000 rpm.
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Subjects:
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Iron oxide
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Nanostructure
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Hydrodynamic conditions
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Photocatalyst
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Water splitting
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Copyrigths:
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Reserva de todos los derechos
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Source:
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Applied Surface Science. (issn:
0169-4332
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DOI:
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10.1016/j.apsusc.2016.09.073
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Publisher:
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Elsevier
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Publisher version:
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https://doi.org/10.1016/j.apsusc.2016.09.073
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Project ID:
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info:eu-repo/grantAgreement/MEC//UPOV08-3E-001/ES/Utilización de Desktop Microscopy System (DMS) en el campo de los materiales/
info:eu-repo/grantAgreement/MINECO//CTQ2013-42494-R/ES/DESARROLLO DE FOTOANODOS CON NUEVAS NANOESTRUCTURAS DE OXIDOS METALICOS PARA LA PRODUCCION DE ENERGIA Y DESTRUCCION DE CONTAMINANTES CON LUZ SOLAR/
info:eu-repo/grantAgreement/MINECO//BES-2014-068713/ES/BES-2014-068713/
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Thanks:
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The authors would like to express their gratitude for the financial support to the Ministerio de Economia y Competitividad (Reference: BES-2014-068713, Project Code: CTQ2013-42494-R), for its help in the Laser Raman ...[+]
The authors would like to express their gratitude for the financial support to the Ministerio de Economia y Competitividad (Reference: BES-2014-068713, Project Code: CTQ2013-42494-R), for its help in the Laser Raman Microscope acquisition (UPOV08-3E-012), for the co-finance by the European Social Fund and to Dr. Asuncion Jaime for her translation assistance
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Type:
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Artículo
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