Dependence of TiO2 nanotube microstructural and electronic properties on water splitting

Autor(es)

Freitas, R. G. ^[1] ; Santanna, M. A. ^[1] ; Pereira, E. C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Quim, NANOFAEL LIEC, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Power Sources; v. 251, p. 178-186, APR 1 2014.
• Citações Web of Science: 17

Resumo

In this work, TiO2 nanotubes were prepared by anodization in ionic liquid at 10 C and 20 C. Different tube diameters (50.8 nm and 70.5 nm) were obtained, and both of them exhibited an anatase phase with distinct crystallite sizes and lattice strains. The increase in the crystallite size led to a decrease in the grain boundary surface area, which could be associated with the recombination centers of the photogenerated charge carriers. Electrochemical impedance spectroscopy was used to correlate the water splitting photoactivity with the charge transfer resistance and the apparent roughness. A schematic representation of the nanotube structures consisting of two layers, compact and porous, proved to be appropriate to clarify the obtained results. (C) 2013 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/06778-0 - Investigação da formação eletroquímica de nanotubos-TiO2 e sua dopagem anódica
• Beneficiário: Milli Aline Sant Anna
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 10/05555-2 - Investigação da formação eletroquímica de nanotubos-TiO2 e sua aplicação em sistemas conversores de energia nanoarquiteturados
• Beneficiário: Renato Garcia de Freitas Sobrinho
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado