In situ radiotracer and voltammetric study of Zn electrosorption on noble metal electrodes. Part I. A novel method for the evaluation of the surface excess of X-ray emitting species in sub-monolayer coverages

Kálmán Varga, Imre Szalóki, Andrea Somogyi, Pál Baradlai, Akiko Aramata, T. Ohnishi, Y. Noya

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In this work, we report a calculation model elaborated for the evaluation of the surface excess of radiolabeled species via measurement of the intensity of low-energy X-rays, and present some new findings obtained by the radiotracer and voltammetric studies of the Zn2+ electrosorption on polycrystalline gold. The preliminary investigations of the underpotential deposition (upd) of Zn2+ ions demonstrates the extremely high sensitivity of the radiotracer technique based on the detection of the Cu-K1.2 X-radiation and assures the reliability of the model calculation procedure. The experimental results reveal that: (i) the upd of Zn2+ ions on polycrystalline gold is measurable even from solution containing 5×10-8 mol dm-3 Zn2+ over the entire potential range where the discharge of protons or water molecules, i.e. hydrogen evolution takes place; (ii) the fractional coverage of the surface obtained under non-equilibrium (transient) conditions in the upd region (from 0.05 to -0.35 V) is no more than 1.5%.

Original languageEnglish
Pages (from-to)121-127
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume485
Issue number2
DOIs
Publication statusPublished - May 12 2000

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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