Radiotracer study of the specific adsorption of HCO- 3 ions on a platinum electrode

Research output: Contribution to journalArticle

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Abstract

The adsorption of HCO- 3 ions was studied by a radiotracer method using 14C labelled Na2CO3 (c ≤ 10-2 mol dm-3) in the presence of a great excess of ClO- 4 ions (0.5 mol dm-3 NaClO4 supporting electrolyte). A reversible adsorption of labelled species was found at pH values above 9. The voltammetric and differential voltradiometric behaviour of a Pt electrode in labelled carbonate solution shows a parallelism indicating the adsorption competition between hydrogen and carbonate species. Increasing the pH of the solution leads to a significant decrease in the extent of the adsorption of the labelled species. This phenomenon can be explained either by the transformation of adsorbing HCO- 3 into non-adsorbing CO2- 3 molecules or by the increasing role of the competitive adsorption of OH- ions at higher OH- concentrations. At pH values lower than 9 the slow strong chemisorption reported in the literature can be easily followed by the radiotracer technique.

Original languageEnglish
Pages (from-to)113-119
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume453
Issue number1-2
Publication statusPublished - Aug 14 1998

Fingerprint

Platinum
Ions
Adsorption
Electrodes
Carbonates
Chemisorption
Bicarbonates
Electrolytes
Hydrogen
Molecules
hydroxide ion

Keywords

  • Alkaline medium
  • HCO
  • Platinum electrode
  • Radiotracer technique
  • Specific adsorption

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

Radiotracer study of the specific adsorption of HCO- 3 ions on a platinum electrode. / Horányi, G.

In: Journal of Electroanalytical Chemistry, Vol. 453, No. 1-2, 14.08.1998, p. 113-119.

Research output: Contribution to journalArticle

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