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Hydrohalic-acid anion interaction with gold surfaces: Au(100) – chloride

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

Abstract

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

In 0.1 M H2SO4 + 1 mM HCl, Cl displaces SO4. At +0.12 V (SCE), the adsorption of a disordered Cl layer begins and lifts the Au(100) reconstruction. At +0.71 V (SCE), a phase transitions into an ordered c(√2 × p)R45° (22 ≥ p ≥ 2.3) structure, a uniaxially incommensurate, quasi-hexagonal structure. Dissolution of Au starts from steps via the formation of AuCl, AuCl2, AuCl3, and AuCl4 complexes.

The detachment of an Au atom from a step edge proceeds with an activation energy of 0.7 eV.

In agreement with the displacement of SO4 by Cl, gold islands on the surface decay fast in the presence of Cl ions in sulfuric acid solution, a process also known as “electrochemical annealing” [1, 2, 3, 4, 5, 6, 7, 8] (see also Sect.  179.13[ https://doi.org/10.1007/978-3-662-53908-8_179]).

Symbols and abbreviations

Short form

Full form

SCE

saturated calomel electrode

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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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