Smoothening Mechanism of Thiourea on Silver Electrodeposition : Real Time Imaging of the Growth Front Evolution

Ag electrodeposits were grown on a polycrystalline Ag cathode at either 0.01 or 1 mA cm<sup>-2</sup> from aqueous 5 × 10<sup>-3</sup> M Ag<sub>2</sub>SO<sub>4</sub> + 10<sup>-2</sup> M H<sub>2</sub>SO<sub>4</sub> + 0...

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Autores principales: Azzaroni, Omar, Schilardi, Patricia Laura, Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1999
Materias:
Ciencias Exactas
Química
Interfaces
Crystallization
Diffusion
Ions
Electrodeposition
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/127440
https://pubs.acs.org/doi/abs/10.1021/la9806092
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-127440
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Química
Interfaces
Crystallization
Diffusion
Ions
Electrodeposition
spellingShingle Ciencias Exactas
Química
Interfaces
Crystallization
Diffusion
Ions
Electrodeposition
Azzaroni, Omar
Schilardi, Patricia Laura
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
Smoothening Mechanism of Thiourea on Silver Electrodeposition : Real Time Imaging of the Growth Front Evolution
topic_facet Ciencias Exactas
Química
Interfaces
Crystallization
Diffusion
Ions
Electrodeposition
description Ag electrodeposits were grown on a polycrystalline Ag cathode at either 0.01 or 1 mA cm<sup>-2</sup> from aqueous 5 × 10<sup>-3</sup> M Ag<sub>2</sub>SO<sub>4</sub> + 10<sup>-2</sup> M H<sub>2</sub>SO<sub>4</sub> + 0.5 M Na<sub>2</sub>SO<sub>4</sub>, in the absence and presence of different amounts of thiourea (TU). The cathode/solution interface evolution in a quasi-bidimensional electrochemical cell was followed with a video microscope imaging system. From TU-free solution a nodular morphology at 0.01 mA cm<sup>-2</sup> and a branched morphology at 1 mA cm<sup>-2</sup> were observed. At 0.01 mA cm<sup>-2</sup> the presence of TU drove the interface motion to a stable roughness regime by suppressing the nucleation and growth of instabilities. Accordingly, the characteristics of the growth front were consistent with the predictions of the Edwards−Wilkinson equation for the interface motion. At 1 mA cm<sup>-2</sup>, those electrodeposits grown in the presence of TU showed a decrease in both the nucleation and growth rates of instabilities, although they were not fully suppressed.
format Articulo
Articulo
author Azzaroni, Omar
Schilardi, Patricia Laura
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_facet Azzaroni, Omar
Schilardi, Patricia Laura
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_sort Azzaroni, Omar
title Smoothening Mechanism of Thiourea on Silver Electrodeposition : Real Time Imaging of the Growth Front Evolution
title_short Smoothening Mechanism of Thiourea on Silver Electrodeposition : Real Time Imaging of the Growth Front Evolution
title_full Smoothening Mechanism of Thiourea on Silver Electrodeposition : Real Time Imaging of the Growth Front Evolution
title_fullStr Smoothening Mechanism of Thiourea on Silver Electrodeposition : Real Time Imaging of the Growth Front Evolution
title_full_unstemmed Smoothening Mechanism of Thiourea on Silver Electrodeposition : Real Time Imaging of the Growth Front Evolution
title_sort smoothening mechanism of thiourea on silver electrodeposition : real time imaging of the growth front evolution
publishDate 1999
url http://sedici.unlp.edu.ar/handle/10915/127440
https://pubs.acs.org/doi/abs/10.1021/la9806092
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