Anisotropic Dissolution of an Au(111) Electrode in Perchloric Acid Solution Containing Chloride Anion Investigated by in Situ STM-The Important Role of Adsorbed Chloride Anion

Shen Ye, Chikara Ishibashi, Kohei Uosaki

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

The anodic dissolution process of Au(111) in a 0.1 M perchloric acid (HClO4) solution containing chloride anion (Cl-) was investigated using an in situ scanning tunneling microscope. The initial dissolution of gold was observed at the step sites when the electrode potentials became more positive than +1.0 V. The rate of the anodic dissolution increased as the potential became more positive. When the potential became more positive than +1.35 V, dissolution on the terraces was also observed. The dissolution of Au(111) anisotropically proceeds in a layer-by-layer mode. Step lines along the [110] direction, which were found in the double-layer region, disappeared, and ones along the [211] direction were newly formed during the dissolution process. The gold surface became rougher when the electrode potential became more positive than +1.45 V, where anodic dissolution and oxide formation simultaneously took place. The gold surface was completely passivated at +1.7 V. The mechanism for the anisotropic dissolution is discussed in relation to the structure of the chloride adlayer on the Au(111) electrode surface.

Original languageEnglish
Pages (from-to)807-812
Number of pages6
JournalLangmuir
Volume15
Issue number3
DOIs
Publication statusPublished - 1999 Feb 2
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Fingerprint Dive into the research topics of 'Anisotropic Dissolution of an Au(111) Electrode in Perchloric Acid Solution Containing Chloride Anion Investigated by in Situ STM-The Important Role of Adsorbed Chloride Anion'. Together they form a unique fingerprint.

Cite this