Investigation of cobalt deposition using the electrochemical quartz crystal microbalance

被引:80
作者
Matsushima, JT [1 ]
Trivinho-Strixino, E [1 ]
Pereira, EC [1 ]
机构
[1] Univ Fed Sao Carlos, Dept Quim, Lab Interdisciplinar Eletroquim & Ceram, Ctr Multidisciplinar Para Desenvolvimento Mat Cer, BR-13565905 Sao Carlos, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
electrodeposition; quartz crystal microbalance; pH effect; cobalt; cobalt hydroxide;
D O I
10.1016/j.electacta.2005.07.003
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Electrodeposition of cobalt from sulfate solutions at different pH values was investigated using the EQCM technique coupled with cyclic voltammetry. The results show that cobalt hydroxide is formed simultaneously with cobalt deposition during the early stages of reduction due to the pH variation near the electrode surface caused by the parallel hydrogen evolution reaction (HER). This result was confirmed using M/z values calculated using the Sauerbrey equation and Faraday's law, which showed the presence of cobalt hydroxide in the electrodeposits. A flux model was developed and it assumes a direct reduction of cobalt, simultaneous HER and the formation of cobalt hydroxide during the early stages of deposition at pH 4.10. When the solution pH is decreased to 3.33 only the direct cobalt reduction is observed without any hydroxylated species formation. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1960 / 1966
页数:7
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