Electrochemical Characterization of Thin Passive Films on Nb Electrodes in H3PO4 Solutions

The electrical and semiconducting properties of thin anodic passive films potentiostatically formed (1 V ≤ Ef ≤ 5 V vs. sce) on polycrystalline niobium electrodes in aqueous 0.5 mol/L H3PO4 solutions (pH 1.3) were studied, at room temperature, using electrochemical impedance spectroscopy. The data...

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Autores principales: Biaggio, Sonia R., Bocchi, Nerilso, Rocha-Filho, Romeu C., Varela, Francisco Eduardo
Formato: Articulo
Lenguaje:Inglés
Publicado: 1997
Materias:
Química
Niobium
Anodic oxide
Semiconducting properties
Potentiostatic growth
Impedance spectroscopy
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/110899
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-110899
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Niobium
Anodic oxide
Semiconducting properties
Potentiostatic growth
Impedance spectroscopy
spellingShingle Química
Niobium
Anodic oxide
Semiconducting properties
Potentiostatic growth
Impedance spectroscopy
Biaggio, Sonia R.
Bocchi, Nerilso
Rocha-Filho, Romeu C.
Varela, Francisco Eduardo
Electrochemical Characterization of Thin Passive Films on Nb Electrodes in H3PO4 Solutions
topic_facet Química
Niobium
Anodic oxide
Semiconducting properties
Potentiostatic growth
Impedance spectroscopy
description The electrical and semiconducting properties of thin anodic passive films potentiostatically formed (1 V ≤ Ef ≤ 5 V vs. sce) on polycrystalline niobium electrodes in aqueous 0.5 mol/L H3PO4 solutions (pH 1.3) were studied, at room temperature, using electrochemical impedance spectroscopy. The data were analysed with a transfer function using a non-linear fitting routine, assuming that the resistance of the film is coupled in series with the faradaic impedance of the Nb(0) → Nb(V) reaction, and these in parallel with the capacitance of the passive film/electrolyte interface. The relative permittivity of the films was estimated as about 44. The number concentration of donors (ND) in the films was found to decrease with Ef (i.e., with increasing film thickness). A flat band potential value of -0.72 V was also obtained from Mott-Schottky plots.
format Articulo
Articulo
author Biaggio, Sonia R.
Bocchi, Nerilso
Rocha-Filho, Romeu C.
Varela, Francisco Eduardo
author_facet Biaggio, Sonia R.
Bocchi, Nerilso
Rocha-Filho, Romeu C.
Varela, Francisco Eduardo
author_sort Biaggio, Sonia R.
title Electrochemical Characterization of Thin Passive Films on Nb Electrodes in H3PO4 Solutions
title_short Electrochemical Characterization of Thin Passive Films on Nb Electrodes in H3PO4 Solutions
title_full Electrochemical Characterization of Thin Passive Films on Nb Electrodes in H3PO4 Solutions
title_fullStr Electrochemical Characterization of Thin Passive Films on Nb Electrodes in H3PO4 Solutions
title_full_unstemmed Electrochemical Characterization of Thin Passive Films on Nb Electrodes in H3PO4 Solutions
title_sort electrochemical characterization of thin passive films on nb electrodes in h3po4 solutions
publishDate 1997
url http://sedici.unlp.edu.ar/handle/10915/110899
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AT bocchinerilso electrochemicalcharacterizationofthinpassivefilmsonnbelectrodesinh3po4solutions
AT rochafilhoromeuc electrochemicalcharacterizationofthinpassivefilmsonnbelectrodesinh3po4solutions
AT varelafranciscoeduardo electrochemicalcharacterizationofthinpassivefilmsonnbelectrodesinh3po4solutions
bdutipo_str Repositorios
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