Radiotracer study of anion adsorption at silver electrodes in acidic medium

G. Horányi, E. M. Rizmayer, J. Konya

Research output: Contribution to journalArticle

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Abstract

The adsorpion of Cl-, HSO- 4 and H2PO- 4 ions on silver electrodes formed by electrodeposition of silver on a thin, smooth silver or gold layer has been studied in acidic medium (mostly in 1 mol dm-3 HClO4) by a radiotracer method using 36Cl-labelled HCl, 35S-labelled H2SO4 and 32P-labelled H3PO4. The potential dependence of the adsorption has been determined at low concentrations of these species (c <10-3 mol dm-3). It was shown that the onset of anodic dissolution of silver is preceded by significant adsorption of the anion. This phehomenon is in accordance with the observation that significant anion adsorption occurs at silver monolayers and sub-monolayers formed by underpotential deposition of silver ions on an inert support (gold, platinum). On the other hand, it was shown that the underpotential deposition of Cd2+ ions on silver results in an increase of the anion adsorption. The influence of pyridine on the adsorption of Cl- ions was studied and it was found that there is no significant change in the chloride adsorption even in the case of very high pyridine/Cl- concentration ratios and at a low initial acid concentration (5 × 10-3 mol dm-3 HClO4 + 1 mol dm-3 NaClO4 supporting electrolyte). Some preliminary results obtained from the study of the adsorption of thiorea (labelled with C-14) are also reported.

Original languageEnglish
Pages (from-to)339-348
Number of pages10
JournalJournal of Electroanalytical Chemistry
Volume176
Issue number1-2
Publication statusPublished - Sep 25 1984

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Silver
Anions
Negative ions
Adsorption
Electrodes
Ions
Gold
Pyridine
Monolayers
Platinum
Electrodeposition
Electrolytes
Chlorides
Dissolution
Acids

ASJC Scopus subject areas

  • Electrochemistry
  • Analytical Chemistry
  • Chemical Engineering(all)

Cite this

Radiotracer study of anion adsorption at silver electrodes in acidic medium. / Horányi, G.; Rizmayer, E. M.; Konya, J.

In: Journal of Electroanalytical Chemistry, Vol. 176, No. 1-2, 25.09.1984, p. 339-348.

Research output: Contribution to journalArticle

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