Fabrication of Porous Nb2O5 by Plasma Electrolysis Anodization and Electrochemical Characterization of the Oxide
2006 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, Vol. 153, no 7, B225-B230 p.Article in journal (Refereed) Published
Porous Nb2O5 electrodes were fabricated by applying anodic pulses of 700 V and 10 ms duration to pure Nb in phosphate bufferedsaline solution (PBS), aiming at biomaterial applications. The porosity of the oxide could be controlled by the number of pulses. X-ray photoelectron spectroscopy analysis confirmed the oxide to be Nb2O5. The electrochemical behavior and interfacial propertiesof the porous Nb2O5 were characterized in PBS by using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). EIS measurements indicate that the oxide film has a two-layer structure with a compact inner layer and a porousouter layer, and the pores were sealed by precipitates during long-time aging in PBS. The two-layer structure of the oxide film wasobserved by examination of the cross section using scanning electron microscopy in backscatter mode. The CV measurementsreveal that the oxide exhibits an electrochemical “rectifying” property. It is stable over a wide potential range but shows hydrogenuptake upon cathodic polarization below −1 V vs Ag/AgCl.
Place, publisher, year, edition, pages
Electrochemical Society, 2006. Vol. 153, no 7, B225-B230 p.
MICRO-ARC OXIDATION; ANODIC BEHAVIOR; TITANIUM-ALLOYS; IMPEDANCE SPECTROSCOPY; TANTALUM ELECTRODES; NIOBIUM ELECTRODES; PASSIVATED NIOBIUM; INITIAL-STAGES; FILMS; IMPLANTS
Materials Chemistry Natural Sciences
IdentifiersURN: urn:nbn:se:kth:diva-60484DOI: 10.1149/1.2196788ISI: 000237945300027ScopusID: 2-s2.0-33744786291OAI: oai:DiVA.org:kth-60484DiVA: diva2:477426
© The Electrochemical Society, Inc. 2006. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in: J. Electrochem. Soc. / Volume 153 / Issue 7.
Qc 201201182012-01-182012-01-132012-03-14Bibliographically approved