Improving the Photoelectrochemical Response of TiO2 Nanotubes upon Decoration with Quantum-Sized Anatase Nanowires

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Title: Improving the Photoelectrochemical Response of TiO2 Nanotubes upon Decoration with Quantum-Sized Anatase Nanowires
Authors: Jankulovska, Milena | Barceló Gisbert, Irene | Lana-Villarreal, Teresa | 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: TiO2 nanotubes | Photoelectrochemical response | Quantum-sized anatase nanowires
Knowledge Area: Química Física
Issue Date: 31-Jan-2013
Publisher: American Chemical Society
Citation: The Journal of Physical Chemistry C. 2013, 117(8): 4024-4031. doi:10.1021/jp311068m
Abstract: TiO2 nanotubes (NTs) have been widely used for a number of applications including solar cells, photo(electro)chromic devices, and photocatalysis. Their quasi-one-dimensional morphology has the advantage of a fast electron transport although they have a relatively reduced interfacial area compared with nanoparticulate films. In this study, vertically oriented, smooth TiO2 NT arrays fabricated by anodization are decorated with ultrathin anatase nanowires (NWs). This facile modification, performed by chemical bath deposition, allows to create an advantageous self-organized structure that exhibits remarkable properties. On one hand, the huge increase in the electroactive interfacial area induces an improvement by 1 order of magnitude in the charge accumulation capacity. On the other hand, the modified NT arrays display larger photocurrents for water and oxalic acid oxidation than bare NTs. Their particular morphology enables a fast transfer of photogenerated holes but also efficient mass and electron transport. The importance of a proper band energy alignment for electron transfer from the NWs to the NTs is evidenced by comparing the behavior of these electrodes with that of NTs modified with rutile NWs. The NT-NW self-organized architecture allows for a precise design and control of the interfacial surface area, providing a material with particularly attractive properties for the applications mentioned above.
Sponsor: We gratefully acknowledge the financial support of the Spanish Ministry of Economy and Competitiveness through projects HOPE CSD2007-00007 (Consolider Ingenio 2010), PRIPIBIN-2011-0816, and MAT2009-14004 (Fondos FEDER). M. Jankulovska is grateful to the Spanish Government for the award of an FPI grant.
URI: http://hdl.handle.net/10045/39138
ISSN: 1932-7447 (Print) | 1932-7455 (Online)
DOI: 10.1021/jp311068m
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2013 American Chemical Society
Peer Review: si
Publisher version: http://dx.doi.org/10.1021/jp311068m
Appears in Collections:INV - GFES - Artículos de Revistas

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