TY - JOUR
T1 - Morphological, electrochemical and photoelectrochemical characterization of nanotubular TiO 2 synthetized electrochemically from different electrolytes
AU - Oyarzún, Diego P.
AU - Córdova, Ricardo
AU - Linarez Pérez, Omar E.
AU - Muñoz, Eduardo
AU - Henríquez, Rodrigo
AU - López Teijelo, Manuel
AU - Gómez, Humberto
N1 - Funding Information:
We thank the Dirección de Investigación e Innovación of the Pontificia Universidad Católica de Valparaíso (grant No. 037.108/2009 DII-PUCV) for financial support for this study. E. Muñoz and R. Henríquez thank Programa Bicentenario de Ciencia y Tecnología, PSD82. D. Oyarzún is grateful to the CONICYT for his thesis scholarship. M. López and O. Linarez thank the Consejo Nacional de Investigaciones Científicas y Técnicas of Argentina (CONICET), the Agencia Nacional de Promoción Científica y Tecnológica (ANPCYT), and the Secretaría de Ciencia y Tecnología (SECYT-UNC) for financial support. O. Linarez also thanks the CONICET for the fellowship grant.
PY - 2011/10
Y1 - 2011/10
N2 - The electrochemical synthesis of auto-organized TiO 2 arrays generated by Ti anodization in different non-aqueous electrolytes was analyzed. Propylene carbonate-based electrolytes seem to be good electrolytic media for the controlled growth of titania nanotube structures. Scanning electron microscopy (SEM) analysis indicated that, depending on the media employed in the synthesis of the TiO 2 nanotubes, different aspect ratios (length/diameter) could be obtained. Impedance analysis using the passive pit model gave the electrical properties of the layers during the different stages of nanotubes formation. Mott-Schottky analysis and the impedance results showed that the TiO 2 nanotubes layers were n-type semiconductors with highly defective walls on top of a resistive barrier layer. Photoelectrochemical measurements showed that tetra(4-carboxyphenyl)porphyrin (TCPP) adsorbed onto the TiO 2 nanotube arrays, which could be employed as an efficient photosensitizer for solar-energy conversion by TCPP-sensitized nanotubular TiO 2 electrodes.
AB - The electrochemical synthesis of auto-organized TiO 2 arrays generated by Ti anodization in different non-aqueous electrolytes was analyzed. Propylene carbonate-based electrolytes seem to be good electrolytic media for the controlled growth of titania nanotube structures. Scanning electron microscopy (SEM) analysis indicated that, depending on the media employed in the synthesis of the TiO 2 nanotubes, different aspect ratios (length/diameter) could be obtained. Impedance analysis using the passive pit model gave the electrical properties of the layers during the different stages of nanotubes formation. Mott-Schottky analysis and the impedance results showed that the TiO 2 nanotubes layers were n-type semiconductors with highly defective walls on top of a resistive barrier layer. Photoelectrochemical measurements showed that tetra(4-carboxyphenyl)porphyrin (TCPP) adsorbed onto the TiO 2 nanotube arrays, which could be employed as an efficient photosensitizer for solar-energy conversion by TCPP-sensitized nanotubular TiO 2 electrodes.
KW - Dye sensitizers
KW - Impedance spectroscopy;
KW - Semiconductors
KW - Titania nanotubes
UR - http://www.scopus.com/inward/record.url?scp=80054731668&partnerID=8YFLogxK
U2 - 10.1007/s10008-010-1236-0
DO - 10.1007/s10008-010-1236-0
M3 - Article
AN - SCOPUS:80054731668
VL - 15
SP - 2265
EP - 2275
JO - Journal of Solid State Electrochemistry
JF - Journal of Solid State Electrochemistry
SN - 1432-8488
IS - 10
ER -