Zinc underpotential deposition at Pt(111) and Pt(110) under the influence of boric acid and chloride anions |
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| Authors: | A. A. El-Shafei S. Taguchi A. Aramata |
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| Affiliation: | (1) Department of Chemistry, Faculty of Science, Mansoura University, 35516 Mansoura, Egypt;(2) Laboratory of Physical Chemistry, Hokkaido University of Education, Ainosato, Sapporo 002-8502, Japan;(3) Catalysis Research Center, Hokkaido University, Sapporo 060-0811, Japan;(4) Hiragishi 1-5-3, Sapporo 062-0931, Japan |
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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. 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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| Keywords: | Zn UPD chloride boric acid Pt(111) Pt(110) various pH |
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