Abstract
Cyclic voltammetric studies were carried out on platinum in alkaline solution containing cobalt sulphate, sodium tungstate, dimethyl sulphoxide and triammonium citrate. Spectral u.v. absorption studies of cobalt citrate complex indicate the species to be [Co L (H2O)3]2+, where L is triammonium citrate. The deposition of cobalt involves a stepwise electron transfer mechanism. The observed cyclic voltammetric data show that the alloy deposition is possibly from cobalt–tungstate complex. The citrate ions and dimethyl sulphoxide hinder the alloy deposition. Dimethyl sulphoxide, which specifically adsorbs on the electrode surface, favours the hydrogen evolution reaction (HER), whereas tungstate hinders the HER. Stripping voltammograms show the existence of cobalt rich alloy phases. X-ray diffraction studies further confirm the phases to be Co3W and Co7W.
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References
U. Admon and M.P. Dariel, J. Appl. Phys. 62 (1987) 1943.
J.P. Wittewaur and T.G. Nietu, Ad. Mater. Process. 142 (1992) 28.
F. Gartner, B. Junk and H. Kreye, Galvanotechnik. 90 (1999) 996.
J. Bhattarai, E. Akiyama, H. Habazaki, A. Kawashima, K. Asami and K. Hashimoto, Corros. Sci. 40 (1998) 155.
L. Ramesh, B.S. Sheshadri, and S.M. Mayanna, Trans IMF 76 (1998) 101.
F.A. Still and J.K. Dennis, Electroplat.Met. Finish. 26 (1974) 9.
S.M. Mayanna, L. Ramesh, B.N. Maruthi and D. Landolt, J Mater. Sci. Lett. 16 (1997) 1305.
L. Ramesh, B.S. Sheshadri and S.M. Mayanna, ‘Royal Society of Chemistry’ (Special publication: ‘Chemistry, Energy and Environment') 217 (1998), p. 505.
B.N. Maruthi, L. Ramesh, S.M. Mayanna and D. Landolt, Plat. Surf. Finish. 86 (1999) 85.
S.M. Mayanna, N. Munichandraiah and T. Mimani, J. Appl. Electrochem. 23 (1993) 339.
S.M. Mayanna and T. Mimani, Surf. Coat. Technol. 79 (1996) 246.
T.A. Alekhina, I.A. Shoshina and B.G. Karbasov, Electrokhimiya 30 (1994) 285.
K. Wikiel and J. Osteryoung, J. Appl. Electrochem. 22 (1992) 506.
A.J. Bard (Ed.), ‘Encyclopedia of Electrochemistry of the Elements’, Vol. 5 (Marcel Dekker, New York, 1976), p. 88.
F.G. Bonica, N. Spataru and T. Spataru, Electroanalysis 9 (1997) 1341.
A.R. Despic and V.D. Jovic, in R.E. White, J.O.M. Bockris and B.E. Conway (Eds), ‘Modern Aspects of Electrochemistry’, Vol. 27 (Plenum Press, New York, 1995), p. 143.
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Aravinda, C., Muralidharan, V. & Mayanna, S. Electrodeposition and dissolution of Co–W alloy films. Journal of Applied Electrochemistry 30, 601–606 (2000). https://doi.org/10.1023/A:1003901500426
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DOI: https://doi.org/10.1023/A:1003901500426