Potential dependent chromate adsorption on gold

Jeremy J. Hatch, Andrew A. Gewirth

Research output: Contribution to journalArticle

Abstract

The adsorption and reduction of chromate on Au(111) were studied using cyclic voltammetry (CV), surface enhanced Raman spectroscopy (SERS), in situ atomic force microscopy (AFM), and scanning tunneling microscopy in slightly acidic media. CV results show the evolution of the species present with each subsequent scan revealing intermediate processes in the deposition of chromate on the surface. SERS indicates that the deposition involves oxidation and reduction cycles between chromate and α- Cr2O3. The intermediate step involves a chromate species chemically bound to the surface. The final film is a mixed Cr(III)/Cr(VI) layer. In situ AFM demonstrates that the Cr2O3 adlayer exhibits a (√3×3√) R30° adlattice relative to the underlying Au(111).

Original languageEnglish (US)
Pages (from-to)D497-D502
JournalJournal of the Electrochemical Society
Volume156
Issue number11
DOIs
StatePublished - Oct 13 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Potential dependent chromate adsorption on gold'. Together they form a unique fingerprint.

  • Cite this