An EQCM-D study of the influence of chloride on the lead anodic oxidation

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• 作者：Maiara O. Salles ; Vitor L. Martins ; Roberto M. Torresi ; Mauro Bertotti
• 关键词：Lead electrodeposition ; Chloride effect ; Quartz crystal microbalance ; Stripping analysis ; Scanning electron microscopy
• 刊名：Electrochimica Acta
• 出版年：2012
• 出版时间：1 September, 2012
• 年：2012
• 卷：78
• 期：Complete
• 页码：347-352
• 全文大小：795 K

文摘

The influence of chloride on the electrodeposition of lead films and their dissolution in anodic stripping voltammetric experiments was examined. Gold substrates were plated with lead films, and mass changes were monitored by using the electrochemical quartz crystal microbalance with dissipation factor (EQCM-D). The results showed that the amount of electrodeposited lead is slightly dependent on the chloride concentration. The charge/mass ratio data indicated the presence of Pb(I) and Pb(II) as a result of film dissolution, and the precipitation and deposition of PbCl₂ onto the electrode surface. Scanning electron microscopy images revealed that the morphology of the lead film was strongly influenced by chloride present in the plating solution and that much rougher films were obtained in comparison with those obtained in the absence of chloride. The rate of the anodic dissolution was higher for lead films with higher surface areas, which lead to an increase in their stripping voltammetric currents.