Mechanism of Anodic Dissolution of Tungsten in Sulfate–Fluoride Solutions

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creativework.keywordsanodic oxidation, electrochemical impedance spectroscopy, primary passivation, spectro-electrochemsitry, tungsten
creativework.publisherMultidisciplinary Digital Publishing Institute (MDPI)en
dc.contributor.authorBojinov M.
dc.contributor.authorPenkova Y.
dc.contributor.authorBetova I.
dc.contributor.authorKarastoyanov V.
dc.date.accessioned2024-11-13T14:47:19Z
dc.date.accessioned2024-11-14T07:26:03Z
dc.date.available2024-11-13T14:47:19Z
dc.date.available2024-11-14T07:26:03Z
dc.date.issued2024-09-01
dc.description.abstractThin passive films on tungsten play an important role during the surface levelling of the metal for various applications and during the initial stages of electrochemical synthesis of thick, nanoporous layers that perform well as photo-absorbers and photo-catalysts for light-assisted water splitting. In the present work, the passivation of tungsten featuring metal dissolution and thin oxide film formation is studied by a combination of in situ electrochemical (voltammetry and impedance spectroscopy) and spectro-electrochemical methods coupled with ex situ surface oxide characterization by XPS. Voltametric and impedance data are successfully reproduced by a kinetic model featuring oxide growth and dissolution coupled with the recombination of point defects, as well as a multistep tungsten dissolution reaction at the oxide/electrolyte interface. The model is in good agreement with the spectro-electrochemical data on soluble oxidation products and the surface chemical composition of the passive oxide.
dc.identifier.doi10.3390/met14091004
dc.identifier.issn2075-4701
dc.identifier.scopusSCOPUS_ID:85205040529en
dc.identifier.urihttps://rlib.uctm.edu/handle/123456789/1518
dc.language.isoen
dc.source.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85205040529&origin=inward
dc.titleMechanism of Anodic Dissolution of Tungsten in Sulfate–Fluoride Solutions
dc.typeArticle
oaire.citation.issue9
oaire.citation.volume14
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