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Induced cation adsorption on platinum and modified platinum electrodes

✍ Scribed by G. Horányi

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
1010 KB
Volume
36
Category
Article
ISSN
0013-4686

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✦ Synopsis

Ahstract-The induced adsorption of cations due to the presence of various adsorbed or chemisorbed molecules and ions on platinum is demonstrated by using 4SCa-labelled Ca2+ ions as model species in both alkaline and acid media.

It is shown that the strong chemisorption of CN-ions results in a significant increase of the Ca2+ adsorption in an alkaline medium leading to a potential dependence of Ca*+ adsorption that is characteristic for the potential dependence of the adsorption of CN-ions.

Some experiments carried out in an acid medium in the presence of Cl-, H,PO; , HSO, (SO:-) anions indicate that the cation adsorption induced by the specific adsorption of anions is a general feature.

The occurrence of Ca2+ adsorption induced by -COOH and -SO,H groups anchored to the electrode surface via chemisorbed organic molecules is presented and discussed. Finally, it is shown that the study of the induced adsorption of labelled Ca2+ species may serve as an indirect tool for the investigation of the adsorption or chemisorption of some molecules and ions.

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