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Hydrohalic acid anion interaction with silver surfaces: Ag(111) – iodide

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

Abstract

In this chapter the experimental results on adsorption of iodide interaction on Ag(111) surface is described.

CV and STM reveal that on Ag(111), iodide forms a (√3 × √3)R30° before and a (8 × 8) structure after a sharp CV peak at ~−0.2 V (SCE) in 5 × 10−4 KI + 0.15 M NaOH solution, the latter being most likely a higher-commensurate compound overlayer.

Note that the Br and Cl- CV peaks appear at more positive potentials (0.0 V (SCE)) than that of iodide (−0.2 V), like on Cu(111), see Fig.  181.1[ https://doi.org/10.1007/978-3-662-53908-8_181].

Cyclic voltammetry indicates iodide adsorption/desorption in the range −0.8 V to −0.6 V (Ag/AgCl) and a phase transition at −0.05 V, i.e., formation of bulk AgI, in 0.1 mM HI + 0.1 mM KI, buffered with KF-KOH at pH 10.

Also a continuous structural compression of the I-lattice from the (√3 × √3R–30°) via a (√3qRβ × √3)R30° to the (√3 × √3)R30° followed by an abrupt phase transition into a rotated hexagonal (√3r × √3r)R(30° + α) structure with increasing potential has been described on the basis of in situ STM and ex situ LEED studies. The latter phase is attributed to a Moiré superstructure [1, 2, 3].

Symbols and abbreviations

Short form

Full form

STM

scanning tunneling microscopy

SCE

saturated calomel electrode

LEED

low-energy electron diffraction

References

  1. 1.
    Foresti, M.I., Innocenti, M., Forni, F., Guidelli, R.: Langmuir. 14, 7008 (1998)CrossRefGoogle Scholar
  2. 2.
    Foresti, M.L., Innocenti, M., Logio, F., Becucci, L., Guidelli, R.: J. Electroanal. Chem. 649, 89 (2010)CrossRefGoogle Scholar
  3. 3.
    Yamada, T., Ogaki, K., Okubo, S., Itaye, K.: Surf. Sci. 369, 321 (1996)CrossRefADSGoogle Scholar

Copyright information

© 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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