Villa Mercedes, Argentina
Villa Mercedes, Argentina

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Zerbino J.O.,Institute Fisicoquimica | Maltz A.,National University of La Plata | Falivene C.,FICES | Avaca N.E.,FICES | And 3 more authors.
Journal of Applied Electrochemistry | Year: 2014

The properties of the confined aqueous layer potentiodynamically formed on polycrystalline gold in aqueous phosphate and sodium dodecylsulphate solutions were studied using voltammetry, ellipsometry, and contact angle measurements. The nature of the incipient oxide layer was analyzed as a function of the cycling time in the double layer-oxide monolayer potential region. The replacement of the electrolyte by hexane allows the increase of the optical signal. Different potential cycling conditions change the homogeneity of the confined aqueous incipient oxide layer leading to different structural characteristics. © 2014 Springer Science+Business Media Dordrecht.


Gassa L.M.,Institute Fisicoquimica INIFTA | Zerbino J.O.,Institute Fisicoquimica INIFTA | Meyra A.,CONICET | Sustersic M.G.,FICES | And 2 more authors.
Journal of Electroanalytical Chemistry | Year: 2014

The properties of anodic passive films potentiostatically formed on polycrystalline gold in aqueous phosphate solutions were studied using voltammetry, electrochemical impedance spectroscopy, and contact angle measurements. The nature of the gold oxide layer was analyzed as a function of a potential holding in the aqueous double layer charge region at the interface between gold and the aqueous layer confined by insoluble organic solvents (hexane, chloroform, anisole, butyl acetate, xylene, and isopropyl ether). Different growth conditions change the homogeneity of the oxide layer leading to different passive properties. A synergetic effect on the gold oxidation of hydrogen dissolved in both the bulk metal and the confined aqueous layer is discussed. © 2014 Elsevier B.V. All rights reserved.

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