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Optical and electrochemical study of cation adsorption on oxide layers on gold and platinum electrodes

✍ Scribed by R.R. Adžić; N.M. Marković

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
651 KB
Volume
30
Category
Article
ISSN
0013-4686

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✦ Synopsis

It has been shown that the adsorption of Bi" * and Tlf cations occurs on oxide layers of Au and Pt electrodes in acid solutions. The initial stages of oxide formation and reduction are inhibited. The effect increases with increasing cation concentration, but diminishes with increasing anion concentration. The adsorption ofeations originates in their interaction with the dipoles of the oxide species on Auand pt surface. A hydrophilic nature of oxidized surface also facilitates this adsorption. Cations apparently a&t the state of adsorbed water and decrease the lateral repulsion of oxide spies and the electric field in the double layer. This causes a retardation of the place-exchange mechanism, leading to a stabilization of oxides, fe, their more irreversible reduction.

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