Cobalt-doped titanium oxide nanotubes grown via one-step anodization for water splitting applications
| Autor: | Sabrina Arcaro, Thais Lemes, Carlos Perez Bergmann, Waleska Campos Guaglianoni, Fernando Bonatto, Annelise Kopp Alves, Janio Venturini |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Nanotube
Anatase Materials science Dopant General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Titanium oxide chemistry.chemical_compound chemistry Chemical engineering Titanium dioxide Water splitting 0210 nano-technology Cobalt Titanium |
| Zdroj: | Applied Surface Science. 464:351-359 |
| ISSN: | 0169-4332 |
| Popis: | Titanium dioxide (TiO2) is one of the most utilized materials for water splitting applications; nonetheless, its poor exciton separation is a major hurdle towards its full realization as a catalyst for hydrogen (H2) production. This work presents a successful one-step method for the preparation of cobalt-doped TiO2 nanotubes. The wafers were prepared via the anodization of metallic titanium foils at two different potentials (20 and 60 V) in a cobalt-enriched electrolyte, in the presence of diethylenetriamine-pentaacetic acid (DTPA). Scanning Electron Microscopy (SEM) images of the prepared samples demonstrate the successful synthesis of homogeneous nanotube arrays. X-ray diffractometry and Raman spectroscopy confirm the insertion of cobalt as a dopant inside the anatase framework. Furthermore, the diffuse reflectance spectra of the samples are strongly affected by the presence of the dopant. As a consequence of the successful insertion, the current density developed by the doped samples under illumination is greatly enhanced, reaching up to a fourfold increase for the 60 V sample at a potential where the electrolysis of water takes place. The developed one-step method shows therefore great promise for future application in the production of photoelectroactive materials for H2 production. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect