Effect of the oxygen diffusion in the anatase-rutile transformation in a TiO₂ nanotubes array obtained by electrochemical anodization.

Unraveling Kinetic Effects during Photoelectrochemical Mineralization of Phenols. Rutile:Anatase TiO2 Nanotube Photoanodes under Thin-Layer Conditions

“…The average length of the nanotubes is 568 (±60) nm, the diameter of the tubes is 109 (±5) nm, and the thickness of the tube walls is 18 (±3) nm. The structural and morphological characteristics are consistent with data previously reported for this type of synthesis. − Therefore, we directed attention to the spectroscopic, photoelectrochemical, and kinetic measurements described below.…”

“…TiO 2 nanotube electrodes were obtained by anodizing commercially pure titanium foil. , The titanium samples were etched in hot HCl, roughening successively with silicon carbide paper (# 80, 120, 240, 360, 400, 600, 1200, and 2000) and then polishing with alumina suspensions of 1, 0.3, and 0.05 μm until achieving a specular mirror finish, cleaned in ethanol using an ultrasonic bath for 10 min, and washed with bi-distilled water. Anodizing was performed in 1:1 ethylene glycol/water in 1% v/v HF solution using a 25 V DC VOLT GP5003 power source with an Agilent 34410A digital multimeter signal recorder during 90 min at room temperature in a two-electrode cell, with a large area Pt wire as a cathode.…”

“…Meanwhile, diverse efforts have been oriented to the structural modification of nanomaterials obtained by high-field anodization . Thermal treatments in controlled atmospheres are common strategies to obtain nanotubes of TiO 2 with a high oxygen vacancy density and Ti 3+ in the structure , or different crystal phases. − This results in new energy levels below the conduction band, modifying the dynamics of the charge carriers and improving charge separation . From the combination of these ideas, it is interesting to carry out an adequate kinetic study of the oxidation of organic matter on TiO 2 nanotubes with some physical modification of interest as the coexistence of different crystalline phases defined by heat treatment.…”

Fotoelectroquímica en sistemas nanoestructurados: una discusión desde sus límites naturales

“…FOTOELECTROQUÍMICA EN SISTEMAS NANOESTRUCTURADOS: UNA DISCUSIÓN DESDE SUS LÍMITES NATURALES León et. al., experimentación apropiada para la obtención de este tipo de materiales (Naranjo et al, 2017;Rueda et al, 2018;Vargas et al, 2019;Leon et al, 2021).…”