The Malaysian Journal of
Analytical Sciences Vol 10 No 1 (2006): 27 -34
SPECTROSCOPIC
STUDY OF ADSORBED CO AT POLYCRYSTALLINE COPPER IN AQUEOUS PHOSPHATE BUFFERED
SOLUTION
Jumat Salimon
School of Chemical Sciences and Food Technology,
Universiti Kebangsaan Malaysia,
43600 Bangi, Selangor DE, Malaysia
Abstract
The behavior of adsorbed
CO at polycrystalline copper surface was investigated by infrared spectroscopy. It was found that the linear adsorbed CO, Cu-COL
was a dominant species on copper surface
at low CO concentration. Cu-COL was
electrochemically converted to bridge bonded CO, Cu-COB at high CO concentration. Increasing the CO surface coverage, OCO will increase the formation of adsorbed bridge
bonded CO. N2 purging treatment was used to examine the stability
of the adsorbed CO through the evacuation process. The Cu-COB remained intact while Cu-COL was completely removed from the copper
surface. It suggests that Cu-COL may involve in a weak bonding to a copper surface
such as in a physisorbed interaction, while Cu-COB consists much stronger bonding such as a chemisorbed
interaction. The N2 purging treatment also gave an additional proof
that Cu-COB was partly converted to copper(I)-
carbonyl, Cu(I)-CO at anodic potential regions.
Keywords: Adsorbed
carbon monoxide, polycrystalline copper, FTIR
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