Influence of Adsorbed Hydroxyl and Carbon Monoxide on Potential-Induced Reconstruction of Au(100) as Examined by Scanning Tunneling Microscopy

Abstract

The potential-dependent hexagonal ( hex ) reconstruction of ordered Au(100) in an alkaline electrolyte, 0.1 M KOH, has been examined by means of in- situ scanning tunneling microscopy. In harmony with recent X-ray diffraction results, the hex (1 x 1) transition occurs at lower potentials, ca 0 V vs SCE, than in weakly adsorbing acidic media such as perchloric acid, consistent with an influence of hydroxide adsorption. The dynamics of the reverse (1 x 1) hex transition accelerate markedly as the potential is lowered below ca -0. 35 V vs SCE. Carbon monoxide adsorption, induced in 0.1 M KOH at negative potentials, facilitates the formation of a notably homogeneous hex phase.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1994
Accession Number
ADA276705

Entities

People

  • Gregory J. Edens
  • Michael J. Weaver
  • N. M. Markovic
  • P. N. Ross
  • Xiaoping Gao

Organizations

  • Purdue University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Adsorption
  • Carbon Monoxide
  • Chemical Synthesis
  • Chemistry
  • Dielectric Gases
  • Diffraction
  • Dynamics
  • Electrodes
  • Mass Transfer
  • Materials
  • Materials Science
  • Oxidation
  • Phase
  • Phase Transformations
  • Scattering
  • Transitions
  • X Rays

Readers

  • Analytical Chemistry
  • Electrochemical Surface Science
  • Materials Science and Engineering.