Studies of the electrodeposition of cobalt on a vitreous carbon electrode
Experiments of cobalt deposition on a vitreous carbon electrode were carried out using cyclic voltammetry and potential steps techniques, in a sulfate medium. Cyclic voltammetry showed two stripping peaks that were attnbuted to the dissolution of two phases: a hydrogen nch cobalt phase and a bulk cobalt phase. Kinetic analysis of I-E response on the reverse scan for a 0.37 M of Co(II), pH 6, presented a value of -0.58 V vs. SCE for the equilibrium potential of the Co/Co(II) couple. The exchange current density was estimated as Io = 4.8 x 10-6 A cm-2 in this solution. Potential step experiments showed that the cobalt deposit on vitreous carbon is formed by a mechanism of progressive nucleation followed by 3-D growth. Both techniques confirmed that cobalt deposition takes place in two single electron steps.
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| Format: | Digital revista |
| Language: | English |
| Published: |
Sociedade Brasileira de Química
1997
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| Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531997000400007 |
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