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An SFG investigation of Au(1 1 1) and Au(2 1 0) electrodes in aqueous solutions containing KCN and cetylpyridinium chloride
Cetylpyridinium chloride (CPC) is known to affect electrocrystallisation processes in the presence of cyanide; this behaviour is believed to be due to surface-specific differences in coadsorption properties. In this paper, the behaviour of Au(1 1 1) and Au(2 1 0) electrodes in contact with neutral a...
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Published in: | Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2004-12, Vol.574 (1), p.85-94 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Cetylpyridinium chloride (CPC) is known to affect electrocrystallisation processes in the presence of cyanide; this behaviour is believed to be due to surface-specific differences in coadsorption properties. In this paper, the behaviour of Au(1
1
1) and Au(2
1
0) electrodes in contact with neutral aqueous solutions of KCN in the absence and in the presence of CPC has been studied as a function of potential by means of sum frequency generation (SFG) spectroscopy. The potential-dependent CN
− stretching band position has been followed. Spectroelectrochemical results were complemented with cyclic voltammetric measurements. The nature and potential dependence of the CN
− adsorbed onto Au(2
1
0) are not measurably affected by the presence of CPC in the electrolyte. On the contrary, with the Au(1
1
1) surface, two CN
−-related bands appear, due to adsorbed cyanide and ionic cyanide present at the surface, respectively. This phenomenon might be linked to the formation of surface ion pairs occupying a fraction of the electrode surface. These SFG results have thus disclosed that the more strongly bound CN
− onto the more open Au(2
1
0) surface is not appreciably influenced by the presence of cetylpyridinium, while the more loosely bound species present on Au(1
1
1) are affected by coadsorption. |
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ISSN: | 1572-6657 0022-0728 1873-2569 0022-0728 |
DOI: | 10.1016/j.jelechem.2004.08.003 |