Dynamics of surface alloying promoted by cadmium underpotential deposition-anodic stripping cycles on irregular silver electrodeposits
The underpotential deposition of Cd from dilute aqueous 5 × 10<sup>−3</sup> M CdSO<sub>4</sub> + 0.5 M Na<sub>2</sub>SO<sub>4</sub> + 0.01 M H<sub>2</sub>SO<sub>4</sub> on Ag electrodeposits grown on polyfaceted Pt single-crysta...
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| Autores principales: | , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
1994
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/119361 |
| Aporte de: |
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I19-R120-10915-119361 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Química Ciencias Exactas Cadmium Irregular silver electrodeposits Scanning tunneling microscopy |
| spellingShingle |
Química Ciencias Exactas Cadmium Irregular silver electrodeposits Scanning tunneling microscopy Martins, M. E. Hernández-Creus, A. Salvarezza, Roberto Carlos Arvia, Alejandro Jorge Dynamics of surface alloying promoted by cadmium underpotential deposition-anodic stripping cycles on irregular silver electrodeposits |
| topic_facet |
Química Ciencias Exactas Cadmium Irregular silver electrodeposits Scanning tunneling microscopy |
| description |
The underpotential deposition of Cd from dilute aqueous 5 × 10<sup>−3</sup> M CdSO<sub>4</sub> + 0.5 M Na<sub>2</sub>SO<sub>4</sub> + 0.01 M H<sub>2</sub>SO<sub>4</sub> on Ag electrodeposits grown on polyfaceted Pt single-crystal microspheres was studied using potentiodynamic and potentiostatic techniques, transmission electron diffraction, scanning tunneling microscopy and X-ray photoelectron spectroscopy. Ag electrodeposits were grown in 5 × 10<sup>−3</sup> M Ag<sub>2</sub>SO<sub>4</sub> + 0.5 M Na<sub>2</sub>SO<sub>4</sub> + 0.01 M H<sub>2</sub>SO<sub>4</sub> at cathodic overpotentials η<sub>c</sub> of −0.06 V and −0.58 V to form a columnar and dendritic Ag surface respectively. Surface rearrangement processes involving the formation of Cd + Ag alloys were studied by stripping voltammetry after the potential was held for a certain time at different preset values covering the potential range in which the degree of surface coverage by Cd atoms was less than or close to unity (θ<sub>c</sub>⩽ 1) on both Ag surfaces. Surface diffusion and penetration of Cd atoms into bulk Ag for θ<sub>c</sub>⩽ 1 are discussed. A place-exchange mechanism is advanced to account for the kinetics of Cd + Ag alloy formation. |
| format |
Articulo Articulo |
| author |
Martins, M. E. Hernández-Creus, A. Salvarezza, Roberto Carlos Arvia, Alejandro Jorge |
| author_facet |
Martins, M. E. Hernández-Creus, A. Salvarezza, Roberto Carlos Arvia, Alejandro Jorge |
| author_sort |
Martins, M. E. |
| title |
Dynamics of surface alloying promoted by cadmium underpotential deposition-anodic stripping cycles on irregular silver electrodeposits |
| title_short |
Dynamics of surface alloying promoted by cadmium underpotential deposition-anodic stripping cycles on irregular silver electrodeposits |
| title_full |
Dynamics of surface alloying promoted by cadmium underpotential deposition-anodic stripping cycles on irregular silver electrodeposits |
| title_fullStr |
Dynamics of surface alloying promoted by cadmium underpotential deposition-anodic stripping cycles on irregular silver electrodeposits |
| title_full_unstemmed |
Dynamics of surface alloying promoted by cadmium underpotential deposition-anodic stripping cycles on irregular silver electrodeposits |
| title_sort |
dynamics of surface alloying promoted by cadmium underpotential deposition-anodic stripping cycles on irregular silver electrodeposits |
| publishDate |
1994 |
| url |
http://sedici.unlp.edu.ar/handle/10915/119361 |
| work_keys_str_mv |
AT martinsme dynamicsofsurfacealloyingpromotedbycadmiumunderpotentialdepositionanodicstrippingcyclesonirregularsilverelectrodeposits AT hernandezcreusa dynamicsofsurfacealloyingpromotedbycadmiumunderpotentialdepositionanodicstrippingcyclesonirregularsilverelectrodeposits AT salvarezzarobertocarlos dynamicsofsurfacealloyingpromotedbycadmiumunderpotentialdepositionanodicstrippingcyclesonirregularsilverelectrodeposits AT arviaalejandrojorge dynamicsofsurfacealloyingpromotedbycadmiumunderpotentialdepositionanodicstrippingcyclesonirregularsilverelectrodeposits |
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Repositorios |
| _version_ |
1764820448296566785 |