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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Electrochemical impedance analysis of TiO2 nanotube porous layers based on an alternative representation of impedance data

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Author(s):
Cordoba-Torres, P. [1] ; Oliveira, N. T. C. [2] ; Bolfarini, C. [2] ; Roche, V. [3, 4] ; Nogueira, R. P. [3, 4]
Total Authors: 5
Affiliation:
[1] UNED, Fac Ciencias, Dept Fis Matemat & Fluidos, Madrid 28040 - Spain
[2] Fed Univ Sao Carlos UFSCar, Dept Mat Engn DEMa, Sao Carlos, SP - Brazil
[3] Univ Grenoble Alpes, LEPMI, F-38000 Grenoble - France
[4] LEPMI, CNRS, F-38000 Grenoble - France
Total Affiliations: 4
Document type: Journal article
Source: Journal of Electroanalytical Chemistry; v. 737, n. SI, p. 54-64, JAN 15 2015.
Web of Science Citations: 15
Abstract

A new direct approach for model identification is proposed. It allows a more accurate survey of the different relaxation processes yielding distinct time constants in electrochemical impedance spectroscopy. With the help of self-organized TiO2 nanotubes layers grown in pure Ti substrates, it is shown that the conventional impedance data representation methods are susceptible to miss some information that is made accessible by the frequency survey of alpha(eff), the effective CPE exponent parameter. In the specific case of the present work, the alternative representation proposed here shows that the electrochemical behavior of the TiO2 layers exposed to Ringer physiological solution is characterized by up to three time constants related to a simple double-layered structure composed by a dense barrier and the porous nanotubes one, instead of the ubiquitous two time constants mentioned in the literature for the same systems. (C) 2014 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 12/11350-0 - Development of nanostructured surfaces, by electrochemical techniques, on biomedical titanium alloys
Grantee:Nilson Tadeu Camarinho de Oliveira
Support type: Scholarships in Brazil - Young Researchers
FAPESP's process: 12/01652-9 - Development of nanostructured surfaces, by electrochemical techniques, on biomedical titanium alloys
Grantee:Nilson Tadeu Camarinho de Oliveira
Support type: Research Grants - Young Investigators Grants