Relationship between the bandgap and electrochemical behavior on TiO 2 nanoparticles prepared sonochemically

L. González-Reyes, I. Hernández-Perez, L. Díaz-Barriga Arceo, A. Manzo-Robledo

Producción científica: Capítulo del libro/informe/acta de congresoCapítulorevisión exhaustiva

4 Citas (Scopus)

Resumen

Nanocristalline TiO2 obtained by a facile and environment-friendly sonochemical method was subjected to thermal treatment in the temperature range of 400-900 °C in order to produce variable anatase-rutile phases ratio. The relationship between the optical bandgap and the electrochemical behavior was studied. All the stages of phase transformation of the as-prepared sample such as: nucleation, growth and coarsening were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that phase transformation mechanism stems from the redistribution of energy in the system and a critical particle size. On the other hand, the samples were characterized by UV-vis spectroscopy for the bandgap studies. The optical band gap of as-prepared sample increases to 3.31 eV with respect to 3.20 eV for bulk-anatase. This expansion could be attributed to quantum size effect. The i-E characteristics of samples with variable anatase-rutile ratio were obtained using cyclic voltammetry technique in a 0.5 M H2SO4 solution at room temperature. The foremost charge magnitude was obtained when anatase had a critical size of 17 nm. Analyzing both particle size for anatase and rutile, we observed that when rutile is the dominating phase and its size difference larger in 35% than anatase, the current reaches its minimum values. Based on electrochemical results, the optimal particle size and content phases control are important in order to obtain an increase in the electrochemical performance in the Hydrogen Evolution Reaction (HER) zone.

Idioma originalInglés
Título de la publicación alojadaMetastable and Nanostructured Materials IV
EditorialTrans Tech Publications Ltd
Páginas105-110
Número de páginas6
ISBN (versión impresa)9783037851838
DOI
EstadoPublicada - 2011

Serie de la publicación

NombreMaterials Science Forum
Volumen691
ISSN (versión impresa)0255-5476
ISSN (versión digital)1662-9752

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