The influence of slow Cu(OH)2 phase formation on the electrochemical behaviour of copper in alkaline solutions
| Autor: | Roberto Carlos Salvarezza, Alejandro Jorge Arvia, J. Gomez Becerra |
|---|---|
| Rok vydání: | 1988 |
| Předmět: |
Chemistry
Anodizing General Chemical Engineering Inorganic chemistry Analytical chemistry Nucleation chemistry.chemical_element potentiodynamic Crystal growth Química Electrochemistry electroreduction Copper Electroquímica Cobre Transition metal alkaline solutions Discos Rotatorios Multiplicity (chemistry) Cyclic voltammetry Ciencias Exactas |
| Zdroj: | SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/0013-4686(88)80059-8 |
| Popis: | Evidences of a slow Cu(OH)2 phase formation with data resulting from potentiodynamic potentiostatic and rotating-ring-disc techniques were obtained during the anodization of copper in 0.1 M NaOH. According to the potential and time windows employed in the different runs, electrochemical results can be explained by admitting two limiting complex structures of the anodic layers namely Cu/Cu2O (porous inner layer)/CuO (outer layer) and Cu/Cu2O (porous inner layer)/CuO/Cu(OH)2 (outer layer). The formation of the Cu(OH)2 layer fits a progressive nucleation and 2-D growth under charge transfer control in the −0.175 ⩽ E ⩽ −0.10 V range and an instantaneous nucleation and 2-D growth mechanism under charge transfer control in the −0.20 ⩽ E ⩽ −0.18 V. A well-defined voltammetric peak multiplicity can be distinguished for the electrochemical of each complex anodic layer. These results furnish a reasonable explanation to discrepancies observed in the literature for the electroformation and electroreduction of anodic layers formed on copper in alkaline solutions. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) Facultad de Ciencias Exactas |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|