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

  • 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 bromide ion on Au(100) surface is described.

In 0.1 M H2SO4 + 1 mMKBr solution, bromide adsorption begins at −0.12 V (SCE) and results in the formation of a disordered Brad layer which lifts the Au(100) reconstruction accompanied by island formation. At +0.1 V (SCE), a phase transition and the formation of a c(√2 × 2√2)R45° structure are observed, and starting at 0.48 V (SCE), i.e., with increasing coverage, a further commensurate-incommensurate transition into a c(√2×p)R45° phase (with p ≤ 2√2), i.e., a uniaxial, continuous compression phase, occurs whose coverage increases from 0.5 to 0.65 ML with increasing potential.

While bromide resides in the hollow sites on Ag(100), it prefers the twofold bridge sites on Au(100) as concluded from DFT calculations.

No ordered Brad structures are observed in alkaline solution, which is explained in terms of competitive adsorption of Br and OH [1, 2, 3, 4, 5, 6, 7, 8, 9].

Symbols and abbreviations

Short form

Full form

DFT

density functional theory

SCE

saturated calomel electrode

ML

monolayer

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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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