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

K. Varga, I. Szalóki, Andrea Somogyi, Pál Baradlai, Akiko Aramata, T. Ohnishi, Y. Noya

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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

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Precious metals
Monolayers
X rays
Gold
Electrodes
Ions
Protons
Hydrogen
Radiation
Molecules
Water

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

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title = "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",
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{\%}.",
author = "K. Varga and I. Szal{\'o}ki and Andrea Somogyi and P{\'a}l Baradlai and Akiko Aramata and T. Ohnishi and Y. Noya",
year = "2000",
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doi = "10.1016/S0022-0728(00)00103-0",
language = "English",
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TY - JOUR

T1 - 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

AU - Varga, K.

AU - Szalóki, I.

AU - Somogyi, Andrea

AU - Baradlai, Pál

AU - Aramata, Akiko

AU - Ohnishi, T.

AU - Noya, Y.

PY - 2000/5/12

Y1 - 2000/5/12

N2 - 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%.

AB - 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%.

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