Dense branched morphology in electrochemical deposition in a thin cell vertically oriented

Convection due to electric and gravity forces increase complexity in thin layer electrochemistry (ECD). We describe conditions in a vertical cell with the cathode above the anode in which global convection is eliminated and a dense branched morphology with a smooth front is obtained. It is shown tha...

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Autores principales: Gonzalez, Graciela Alicia, Soba, Alejandro, Molina, Fernando Victor
Publicado: 2007
Materias:
Electrodeposition
Ion transport
Migration
Numerical simulations
Thin cells
Cathodes
Computer simulation
Concentration (process)
Large scale systems
Measurement theory
Numerical methods
Poisson equation
Problem solving
Protons
Dense branched morphology
Dimensional modeling
Electrochemical cells
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v53_n1_p133_Gonzalez
http://hdl.handle.net/20.500.12110/paper_00134686_v53_n1_p133_Gonzalez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00134686_v53_n1_p133_Gonzalez
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spelling paper:paper_00134686_v53_n1_p133_Gonzalez2023-06-08T14:35:55Z Dense branched morphology in electrochemical deposition in a thin cell vertically oriented Gonzalez, Graciela Alicia Soba, Alejandro Molina, Fernando Victor Electrodeposition Ion transport Migration Numerical simulations Thin cells Cathodes Computer simulation Concentration (process) Large scale systems Measurement theory Numerical methods Poisson equation Problem solving Protons Dense branched morphology Dimensional modeling Electrochemical cells Convection due to electric and gravity forces increase complexity in thin layer electrochemistry (ECD). We describe conditions in a vertical cell with the cathode above the anode in which global convection is eliminated and a dense branched morphology with a smooth front is obtained. It is shown that these conditions allow a theoretical one dimensional modeling notably simplifying the complex analysis of the problem. We report experimental measurements under constant current conditions showing that the deposit, cathodic and proton fronts scale linearly with time, a signature of migration controlled regime. We discuss a theoretical ECD model under galvanostatic conditions with a three ion electrolyte and a growth model, consisting in the one dimensional Nernst-Planck equations for ion transport, the Poisson equation for the electric field and a growth law whose front velocity equals the anion mobility times the local electric field. The model predicts cation, anion and proton concentration profiles, electric field variations and deposit growth speed, that are in good agreement with experiments; the predicted evolution and collision of the deposit and proton fronts reveal a time scaling close to those observed in experiments. © 2007 Elsevier Ltd. All rights reserved. Fil:González, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Soba, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Molina, F.V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v53_n1_p133_Gonzalez http://hdl.handle.net/20.500.12110/paper_00134686_v53_n1_p133_Gonzalez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Electrodeposition
Ion transport
Migration
Numerical simulations
Thin cells
Cathodes
Computer simulation
Concentration (process)
Large scale systems
Measurement theory
Numerical methods
Poisson equation
Problem solving
Protons
Dense branched morphology
Dimensional modeling
Electrochemical cells
spellingShingle Electrodeposition
Ion transport
Migration
Numerical simulations
Thin cells
Cathodes
Computer simulation
Concentration (process)
Large scale systems
Measurement theory
Numerical methods
Poisson equation
Problem solving
Protons
Dense branched morphology
Dimensional modeling
Electrochemical cells
Gonzalez, Graciela Alicia
Soba, Alejandro
Molina, Fernando Victor
Dense branched morphology in electrochemical deposition in a thin cell vertically oriented
topic_facet Electrodeposition
Ion transport
Migration
Numerical simulations
Thin cells
Cathodes
Computer simulation
Concentration (process)
Large scale systems
Measurement theory
Numerical methods
Poisson equation
Problem solving
Protons
Dense branched morphology
Dimensional modeling
Electrochemical cells
description Convection due to electric and gravity forces increase complexity in thin layer electrochemistry (ECD). We describe conditions in a vertical cell with the cathode above the anode in which global convection is eliminated and a dense branched morphology with a smooth front is obtained. It is shown that these conditions allow a theoretical one dimensional modeling notably simplifying the complex analysis of the problem. We report experimental measurements under constant current conditions showing that the deposit, cathodic and proton fronts scale linearly with time, a signature of migration controlled regime. We discuss a theoretical ECD model under galvanostatic conditions with a three ion electrolyte and a growth model, consisting in the one dimensional Nernst-Planck equations for ion transport, the Poisson equation for the electric field and a growth law whose front velocity equals the anion mobility times the local electric field. The model predicts cation, anion and proton concentration profiles, electric field variations and deposit growth speed, that are in good agreement with experiments; the predicted evolution and collision of the deposit and proton fronts reveal a time scaling close to those observed in experiments. © 2007 Elsevier Ltd. All rights reserved.
author Gonzalez, Graciela Alicia
Soba, Alejandro
Molina, Fernando Victor
author_facet Gonzalez, Graciela Alicia
Soba, Alejandro
Molina, Fernando Victor
author_sort Gonzalez, Graciela Alicia
title Dense branched morphology in electrochemical deposition in a thin cell vertically oriented
title_short Dense branched morphology in electrochemical deposition in a thin cell vertically oriented
title_full Dense branched morphology in electrochemical deposition in a thin cell vertically oriented
title_fullStr Dense branched morphology in electrochemical deposition in a thin cell vertically oriented
title_full_unstemmed Dense branched morphology in electrochemical deposition in a thin cell vertically oriented
title_sort dense branched morphology in electrochemical deposition in a thin cell vertically oriented
publishDate 2007
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v53_n1_p133_Gonzalez
http://hdl.handle.net/20.500.12110/paper_00134686_v53_n1_p133_Gonzalez
work_keys_str_mv AT gonzalezgracielaalicia densebranchedmorphologyinelectrochemicaldepositioninathincellverticallyoriented
AT sobaalejandro densebranchedmorphologyinelectrochemicaldepositioninathincellverticallyoriented
AT molinafernandovictor densebranchedmorphologyinelectrochemicaldepositioninathincellverticallyoriented
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