An electrochemical and surface analytical study of the formation of nanoporous oxides on niobium

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creativework.keywords2D and 3D distributions, Anodic oxidation, Local electrochemical impedance spectroscopy, Niobium, Porous oxide
creativework.publisherElsevier Ltden
dc.contributor.authorTzvetkov B.
dc.contributor.authorBojinov M.
dc.contributor.authorGirginov A.
dc.contributor.authorPébère N.
dc.date.accessioned2024-07-10T14:27:03Z
dc.date.accessioned2024-07-10T14:47:02Z
dc.date.available2024-07-10T14:27:03Z
dc.date.available2024-07-10T14:47:02Z
dc.date.issued2007-10-10
dc.description.abstractIn the present paper, the anodization of Nb in mixed sulphate + fluoride electrolytes resulting in the formation of a nanoporous oxide film has been studied. Chronoamperometry and electrochemical impedance spectroscopy have been employed to characterise in situ the kinetics of the oxidation process. In addition, the evolution of the layer structure and morphology has been followed by ex situ scanning electron microscopy. Particularly, local electrochemical impedance spectroscopy has been used to discern between the mesoscopic 2D and 3D distributions of time constants at the electrode surface. The similarity between local and global impedance spectra during anodic oxidation of Nb demonstrates the presence of an inherent 3D distribution of the high-frequency time constant, which is interpreted as in-depth variation of the steady state conductivity of the passive film. The experimental and calculational results are discussed in relation to the micro- and nanoscopic structure of the formed oxide. © 2007 Elsevier Ltd. All rights reserved.
dc.identifier.doi10.1016/j.electacta.2006.12.034
dc.identifier.issn0013-4686
dc.identifier.scopusSCOPUS_ID:34547902857en
dc.identifier.urihttps://rlib.uctm.edu/handle/123456789/129
dc.language.isoen
dc.source.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=34547902857&origin=inward
dc.titleAn electrochemical and surface analytical study of the formation of nanoporous oxides on niobium
dc.typeArticle
oaire.citation.issue27 SPEC. ISS.
oaire.citation.volume52
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