The effect of the heating rate on anatase crystal orientation and its impact on the photoelectrocatalytic performance of TiO2 nanotube arrays

Harrison Sierra-Uribe, Elcy María Córdoba-Tuta, Próspero Acevedo-Peña

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

11 Citas (Scopus)

Resumen

Tuning the degree of anatase crystal orientation in TiO2 nanotube arrays has emerged as a new strategy to control their photoelectrochemical performance, since electron transport through the nanotubular film is favored. However, the existing literature fails to provide an accurate approach to evaluate the impact of anatase crystal orientation, since it is normally studied using TiO2 nanotube films synthesized in different anodizing baths, which in turn affects the properties of the films. In this work, anatase crystal orientation was controlled by changing the heating rate during sample heat-treatment (450C for 30 min), which resulted in randomly oriented anatase crystals when the film was taken from room temperature to 450C, to highly crystalline films with preferential anatase crystal orientation when the heating rate was decreased to 5 C min−1 and 1 C min−1. Even though the physicochemical properties of the films were almost unaltered, increasing anatase crystal orientation resulted in higher photocurrents and photoelectrocatalytic methyl orange discoloration, showing a maximum for the film treated at a heating rate of 5C min−1.

Idioma originalInglés
Páginas (desde-hasta)H279-H285
PublicaciónJournal of the Electrochemical Society
Volumen164
N.º6
DOI
EstadoPublicada - 2017
Publicado de forma externa

Nota bibliográfica

Publisher Copyright:
© 2017 The Electrochemical Society.

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