A comparative study of the early stages of mercury, cadmium, lead, silver and copper electrodeposition on columnar and smooth platinum electrodes
The early stages of metal (M) electrodeposition (M = Cu, Ag, Pb, Cd and Hg) on columnar and smooth Pt substrates (S) were investigated in acid solutions applying potentiodynamic techniques. At moderate and high potential scanning rates M electrodeposition on columnar substrates yields M domains whic...
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| Autores principales: | , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
1996
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/118428 |
| Aporte de: |
| Sumario: | The early stages of metal (M) electrodeposition (M = Cu, Ag, Pb, Cd and Hg) on columnar and smooth Pt substrates (S) were investigated in acid solutions applying potentiodynamic techniques. At moderate and high potential scanning rates M electrodeposition on columnar substrates yields M domains which are dominated either by M-S interactions (M-S domains) or M-M interactions (M-M domains) as deduced from anodic stripping data. The roughness of S, the rate of surface diffusion of M atoms and the exchange current density of the M/M<sup>z+</sup> electrode reaction have a remarkable influence on the growth mode of the M overlayer. Rearrangements involving M-S and M-M domains leading to equilibrium at the M overlayer were deduced from voltammetric data. The rate of these rearrangements depends mainly on the surface diffusion of M atoms. Correlations between the charge related to M-S domains and ∆H<sub>s</sub>, the enthalpy of sublimation, and T<sub>m</sub>, the melting temperature of M, were established. These parameters reflect the trend of M atoms to participate in surface diffusion processes. |
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