The dynamics of the conversion of linear to bridge bonded CO on Cu

Jumat Salimon, R. M. Hernández-Romero, M. Kalaji

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The adsorption of CO on copper in buffered phosphate solutions occurs at two types of binding sites, linearly bonded CO, COL and bridge bonded CO, COB. A competing adsorption reaction between CO and pre-adsorbed anions occurs and the removal of anions from the surface is crucial for the adsorption of CO to occur. The appearance of an adsorbed CO and its preference for an adsorption site on copper are dependent on the magnitude and duration of the applied polarisation potential, the concentration of CO in solution, CO surface coverage and temperature. COL appears immediately after the surface is polarised at a high negative potential and continues to be observed in the potential range -1.5 to -1.0 V versus saturated calomel electrode. On the other hand, COB becomes the dominant species as the electrode is polarised for prolonged periods and is stable over a wide potential window, from -1.5 to -0.1 V. At potentials more positive than -0.1 V, the oxidation of the copper surface is accompanied by the formation of Cu(I) carbonyl. The CO in the carbonyl originates from COB.

Original languageEnglish
Pages (from-to)99-108
Number of pages10
JournalJournal of Electroanalytical Chemistry
Volume538-539
DOIs
Publication statusPublished - 13 Dec 2002

Fingerprint

Carbon Monoxide
Adsorption
Copper
Negative ions
Electrodes
Binding sites
Phosphates
Anions
Polarization
Oxidation
Binding Sites
Temperature

Keywords

  • Carbon monoxide
  • Copper
  • Copper carbonyl
  • In situ FTIR

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

The dynamics of the conversion of linear to bridge bonded CO on Cu. / Salimon, Jumat; Hernández-Romero, R. M.; Kalaji, M.

In: Journal of Electroanalytical Chemistry, Vol. 538-539, 13.12.2002, p. 99-108.

Research output: Contribution to journalArticle

Salimon, Jumat ; Hernández-Romero, R. M. ; Kalaji, M. / The dynamics of the conversion of linear to bridge bonded CO on Cu. In: Journal of Electroanalytical Chemistry. 2002 ; Vol. 538-539. pp. 99-108.
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AB - The adsorption of CO on copper in buffered phosphate solutions occurs at two types of binding sites, linearly bonded CO, COL and bridge bonded CO, COB. A competing adsorption reaction between CO and pre-adsorbed anions occurs and the removal of anions from the surface is crucial for the adsorption of CO to occur. The appearance of an adsorbed CO and its preference for an adsorption site on copper are dependent on the magnitude and duration of the applied polarisation potential, the concentration of CO in solution, CO surface coverage and temperature. COL appears immediately after the surface is polarised at a high negative potential and continues to be observed in the potential range -1.5 to -1.0 V versus saturated calomel electrode. On the other hand, COB becomes the dominant species as the electrode is polarised for prolonged periods and is stable over a wide potential window, from -1.5 to -0.1 V. At potentials more positive than -0.1 V, the oxidation of the copper surface is accompanied by the formation of Cu(I) carbonyl. The CO in the carbonyl originates from COB.

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