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Electrochemical Oxidation of Silver and Copper in Aqueous Basic Media and in Fused Hydroxide Electrolytes

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Author(s): Tejada-Rosales, E. M. | Casañ-Pastor, N. | Gómez-Romero, P.

Journal: Boletín de la Sociedad Española de Cerámica y Vidrio
ISSN 0366-3175

Volume: 43;
Issue: 2;
Start page: 220;
Date: 2004;
Original page

Keywords: Electrooxidation | molten hydroxides | silver-copper oxides | Oxidacíon electroquímica | hidróxidos fundidos | óxidos de plata y cobre

ABSTRACT
The anodic oxidations of copper and silver electrodes in basic media are reported. Experiments were conducted both in aqueous NaOH solutions and in a flux of molten NaOH/KOH eutectic. The oxidation processes were studied by means of cyclic voltammetry and chronoamperometries and the phases obtained were systematically characterized by x-ray diffraction. The ranges of stability of each phase in the different media studied are reported. In addition to known oxides of copper or silver, a new silver oxide was isolated.En este trabajo se describe la oxidación anódico de electrodos de plata y de cobre en medios básicos. Se han utilizado tanto medios acuosos como hidróxidos fundidos (eutéctico NaOH/KOH). Los procesos de oxidación se han estudiado mediante voltametría cíclica y cronoamperometría, y las fases resultantes han sido caracterizadas por difracción de Rayos X. Los rangos de estabilidad encontrados para cada uno dependen del medio utilizado. Además de óxidos conocidos de cobre y de plata, se ha aislado un nuevo óxido de plata.

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