Hydrohalic acid anion interaction with platinum surfaces: Pt(100) – iodide

  • M. NowickiEmail author
  • K. Wandelt
Part of the Condensed Matter book series (volume 45B)


In this chapter the experimental results on adsorption of iodide ion on Pt(100) surface is described.

In a 10−3 M KI + 10−2 M KOH (pH = 12) solution, iodide anions adsorb at 300 mV (RHE) and desorb at 190 mV (RHE). It forms a (√2 × 5√2)R45° structure as seen in STM. AES and LEED results are unaffected by a change in electrolyte concentration, e.g., to 10−4 M KI + 10−4 M KOH (pH = 10). Comparison of coulometric data and AES suggests a one-electron reduction Iad + e→ I. LEED data suggest a potential dependent iodide coverage and structure, namely, (3 × 3) (θI = 4/9), (√7 × √7)R19.1° (θI = 3/7) at positive potentials, and (√3 × √3)R30° (θI = 1/3) at intermediate potentials. The influence of pH, i.e., the OH concentration, is weak; probably the strong I-Pt interaction prevents OH adsorption anyway [1, 2, 3].

Symbols and abbreviations

Short form

Full form


reference hydrogen electrode


scanning tunneling microscopy


low-energy electron diffraction


Auger electron spectroscopy


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  2. 2.
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  3. 3.
    Lu, F., Salaita, G.N., Baltruschat, H., Hubbard, A.T.: J. Electroanal. Chem. Interfacial Electrochem. 222, 305 (1987)CrossRefGoogle Scholar

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© Springer-Verlag GmbH Germany 2018

Authors and Affiliations

  1. 1.Institute of Experimental PhysicsUniversity of WroclawWroclawPoland
  2. 2.Institute of Physical and Theoretical ChemistryUniversity of BonnBonnGermany

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