Abstract
The electrodeposition of cobalt onto gold is studied as a function of the pH of the electrolyte. Electrochemical quartz crystal microgravimetry is used to identify the material deposited. Using a Co sulfate solution without additives, it is found that for pH <-3.2, Co metal deposits. For pH > 3.2 and at sufficiently negative applied potential, first Co hydroxide deposits and then Co metal. The addition of boric acid, H3BO3 to cobalt sulfate solutions leads to different results: measurements done up to pH 5.5 indicate that only Co metal deposits, showing that boric acid prevents the formation of cobalt hydroxide.
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Published in Russian in Elektrokhimiya, 2007, Vol. 43, No. 7, pp. 899–902.
The text was submitted by the authors in English.
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Lafouresse, M., Medvedev, A., Kutuso, K. et al. pH dependence of the composition of electrodeposited Co films in aqueous sulfate solutions. Russ J Electrochem 43, 856–858 (2007). https://doi.org/10.1134/S1023193507070178
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DOI: https://doi.org/10.1134/S1023193507070178