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Zinc underpotential deposition at Pt(111) and Pt(110) under the influence of boric acid and chloride anions

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Abstract

Zinc underpotential deposition (Zn UPD) was studied by cyclic voltammetry in solutions of various pH and composition, where the effects of the presence of boric acid or chloride in the solution were observed. We have found that the cyclic voltammograms of Zn UPD at Pt(111) were dependent on boric acid concentrations, zinc ion concentrations, and pH in acidic solutions. These suggest that the induced adsorption of borate by releasing of H+ is accompanied with Zn UPD. The preadsorbed chloride species on Pt(110) accelerate the UPD process by their removal just before the UPD, making the surface sites available for the process, and the UPD remains at identical electrode potentials, while the chloride ions do not take part in the induced adsorption on UPD Zn at Pt, as clearly found by the radiotracer method. These show that the anions play versatile roles in the process of adlayer formation by their different but essential chemical characteristics.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Mansoura University, 35516, Mansoura, Egypt

    A. A. El-Shafei

  2. Laboratory of Physical Chemistry, Hokkaido University of Education, Ainosato, Sapporo, 002-8502, Japan

    S. Taguchi

  3. Catalysis Research Center, Hokkaido University, Sapporo, 060-0811, Japan

    A. Aramata

  4. Hiragishi 1-5-3, Sapporo, 062-0931, Japan

    A. Aramata

Authors
  1. A. A. El-Shafei
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  2. S. Taguchi
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  3. A. Aramata
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Corresponding authors

Correspondence to A. A. El-Shafei or A. Aramata.

Additional information

Published in Russian in Elektrokhimiya, 2008, Vol. 44, No. 6, pp. 745–751

The text was submitted by the authors in English.

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El-Shafei, A.A., Taguchi, S. & Aramata, A. Zinc underpotential deposition at Pt(111) and Pt(110) under the influence of boric acid and chloride anions. Russ J Electrochem 44, 690–696 (2008). https://doi.org/10.1134/S1023193508060098

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  • DOI: https://doi.org/10.1134/S1023193508060098

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