A comparative evaluation on the anodic behavior of Cu and Ag electrodes in non-aqueous fluoride and fluoroborate media
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
View Archive Info| Field | Value | |
| Title |
A comparative evaluation on the anodic behavior of Cu
and Ag electrodes in non-aqueous fluoride and fluoroborate
media
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| Creator |
Suryanarayanan, V.
Noel, M. |
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| Subject |
Electroorganic
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| Description |
The voltammetric responses of copper and
silver had been extensively studied and compared in a
variety of non-aqueous solvents such as acetonitrile (AN),
propylene carbonate (PC) and sulfolane containing two
different supporting electrolytes namely triethylaminetrishydrogen
fluoride (TEA.3HF) and tetrabutylammonium
tetrafluoroborate (TBABF4). The dissolution rate
and surface transformation on the electrode surfaces as a
result of anodic polarization was investigated using atomic
absorption spectroscopy (AAS) and scanning electron
microscopy (SEM), respectively. In solvent-free TEA.3HF
medium, the copper electrode shows high charge recovery
ratio (Qc/Qa), and the difference between the initial anodic
and cathodic potentials, obtained at a current density of
2 mA cm−2, is around 0.11 V, suggesting that in this
medium, Cu can certainly serve as reference electrode. On
the other hand, on Ag electrode, substantial dissolution
was observed leading to very high anodic (Qa) and
cathodic (Qc) charges, and the surface morphology after
the cyclic polarization results in roughened surface with
large pores. The effects of incorporating AN and water as
additives in TEA.3HF on the solubility and stability of
these metal fluoride films are also reported. The dissolution
pattern and film formation behavior of these two
metals in the different solvents containing fluoride and
fluoroborate ionic species have several qualitative similarities,
as noted from cyclic voltammetry responses and
SEM morphology. Anodic dissolution and precipitation
process for both Cu and Ag depends significantly on the
nature of supporting electrolytes as well as solvents. In
AN containing 0.1 M TEA.3HF, the dissolution of Cu and
Ag electrodes was very high. Fluoride salts of Cu show
lesser solubility than Ag in those solvents, while fluoroborate
salts exhibit the reverse trend. The AAS data
suggest that for a particular salt, which may be either
fluoride or fluoroborate of Cu and Ag, the relative
solubility decreases in the order AN > PC > sulfolane.
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| Publisher |
Springer-Verlag
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| Date |
2009
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/663/1/137-2009.pdf
Suryanarayanan, V. and Noel, M. (2009) A comparative evaluation on the anodic behavior of Cu and Ag electrodes in non-aqueous fluoride and fluoroborate media. Journal of Solid State Electrochemistry, 13 (12). pp. 1913-1923. ISSN 1432-8488 |
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| Relation |
http://cecri.csircentral.net/663/
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