Directing photocatalytic and photoelectrocatalytic performance of TiO2 by using TEA and NH4F as doping precursors

Edgar Leonardo Castellanos-Leal, Próspero Acevedo-Peña, Luis Lartundo-Rojas, Elcy María Córdoba-Tuta

Producción científica: Contribución a una revistaArtículo en revista científica indexadarevisión exhaustiva

6 Citas (Scopus)

Resumen

Abstract: Triethylamine (TEA) and NH4F-modified TiO2 powders and thin films were prepared by combining sol–gel and hydrothermal processes. Modification with TEA results in increased specific surface area and induces energy states below the conduction band of TiO2. On the other hand, the use of NH4F decreases the band-gap, displacing the valence band. Employing radical-scavenging agents, it was found that formation of O2 * is preferred in TEA-modified TiO2, whereas generation of both O2 * and OH* results from simultaneous modification. Furthermore, the photocatalytic degradation rate was directly proportional to their specific surface area. However, this trend was reversed in a photoelectrocatalytic cell, due to the fact that the photogenerated electrons are rapidly transported to the rear contact, which restrains their transfer to the dissolved oxygen to generate O2 *. Therefore, the presence of OH* radicals and direct charge transfer processes appears to play a key role in the photoelectrocatalytic process. Graphical Abstract: [Figure not available: see fulltext.]

Idioma originalInglés
Páginas (desde-hasta)462-473
Número de páginas12
PublicaciónJournal of Sol-Gel Science and Technology
Volumen80
N.º2
DOI
EstadoPublicada - 1 nov. 2016
Publicado de forma externa

Nota bibliográfica

Publisher Copyright:
© 2016, Springer Science+Business Media New York.

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