Theory of Anodic Stripping Voltammetry at Wall-Jet Electrodes. Simulation of Spatially Differential Stripping and Redeposition Phenomena
Autor(a) principal: | |
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Data de Publicação: | 1998 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/10325 https://doi.org/10.1021/jp9720810 |
Resumo: | Numerical simulations based on the time dependent backward implicit method are used to develop the theory of anodic stripping voltammetry carried out under hydrodynamic conditions using mercury thin film wall-jet electrodes. The peak shape is shown to be highly sensitive both to electrolyte flow rate and to the potential sweep rate. The simulations permit visualization of concentrations both in solution and in the film throughout the voltammetric potential sweep. They reveal the film to be stripped in a spatially nonuniform fashion with the flow inducing the center of the electrode to be depleted before, and at less positive potentials than, the radial extremities of the electrode. Moreover for electrochemically reversible systems with flow and sweep rate parameters similar to those employed in analytical practice it is seen that material oxidized from the electrode center can become redeposited at radial distances closer to the electrode edge where the diffusion layer is thicker, before being re-oxidized later on in the potential sweep at more positive potentials. |
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Theory of Anodic Stripping Voltammetry at Wall-Jet Electrodes. Simulation of Spatially Differential Stripping and Redeposition PhenomenaNumerical simulations based on the time dependent backward implicit method are used to develop the theory of anodic stripping voltammetry carried out under hydrodynamic conditions using mercury thin film wall-jet electrodes. The peak shape is shown to be highly sensitive both to electrolyte flow rate and to the potential sweep rate. The simulations permit visualization of concentrations both in solution and in the film throughout the voltammetric potential sweep. They reveal the film to be stripped in a spatially nonuniform fashion with the flow inducing the center of the electrode to be depleted before, and at less positive potentials than, the radial extremities of the electrode. Moreover for electrochemically reversible systems with flow and sweep rate parameters similar to those employed in analytical practice it is seen that material oxidized from the electrode center can become redeposited at radial distances closer to the electrode edge where the diffusion layer is thicker, before being re-oxidized later on in the potential sweep at more positive potentials.American Chemical Society1998-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/10325http://hdl.handle.net/10316/10325https://doi.org/10.1021/jp9720810engThe Journal of Physical Chemistry B. 102:1 (1998) 162-1661520-6106Ball, Jon C.Compton, Richard G.Brett, Christopher M. A.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2020-05-25T13:13:20Zoai:estudogeral.uc.pt:10316/10325Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:01:12.915761Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Theory of Anodic Stripping Voltammetry at Wall-Jet Electrodes. Simulation of Spatially Differential Stripping and Redeposition Phenomena |
title |
Theory of Anodic Stripping Voltammetry at Wall-Jet Electrodes. Simulation of Spatially Differential Stripping and Redeposition Phenomena |
spellingShingle |
Theory of Anodic Stripping Voltammetry at Wall-Jet Electrodes. Simulation of Spatially Differential Stripping and Redeposition Phenomena Ball, Jon C. |
title_short |
Theory of Anodic Stripping Voltammetry at Wall-Jet Electrodes. Simulation of Spatially Differential Stripping and Redeposition Phenomena |
title_full |
Theory of Anodic Stripping Voltammetry at Wall-Jet Electrodes. Simulation of Spatially Differential Stripping and Redeposition Phenomena |
title_fullStr |
Theory of Anodic Stripping Voltammetry at Wall-Jet Electrodes. Simulation of Spatially Differential Stripping and Redeposition Phenomena |
title_full_unstemmed |
Theory of Anodic Stripping Voltammetry at Wall-Jet Electrodes. Simulation of Spatially Differential Stripping and Redeposition Phenomena |
title_sort |
Theory of Anodic Stripping Voltammetry at Wall-Jet Electrodes. Simulation of Spatially Differential Stripping and Redeposition Phenomena |
author |
Ball, Jon C. |
author_facet |
Ball, Jon C. Compton, Richard G. Brett, Christopher M. A. |
author_role |
author |
author2 |
Compton, Richard G. Brett, Christopher M. A. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Ball, Jon C. Compton, Richard G. Brett, Christopher M. A. |
description |
Numerical simulations based on the time dependent backward implicit method are used to develop the theory of anodic stripping voltammetry carried out under hydrodynamic conditions using mercury thin film wall-jet electrodes. The peak shape is shown to be highly sensitive both to electrolyte flow rate and to the potential sweep rate. The simulations permit visualization of concentrations both in solution and in the film throughout the voltammetric potential sweep. They reveal the film to be stripped in a spatially nonuniform fashion with the flow inducing the center of the electrode to be depleted before, and at less positive potentials than, the radial extremities of the electrode. Moreover for electrochemically reversible systems with flow and sweep rate parameters similar to those employed in analytical practice it is seen that material oxidized from the electrode center can become redeposited at radial distances closer to the electrode edge where the diffusion layer is thicker, before being re-oxidized later on in the potential sweep at more positive potentials. |
publishDate |
1998 |
dc.date.none.fl_str_mv |
1998-01-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10316/10325 http://hdl.handle.net/10316/10325 https://doi.org/10.1021/jp9720810 |
url |
http://hdl.handle.net/10316/10325 https://doi.org/10.1021/jp9720810 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
The Journal of Physical Chemistry B. 102:1 (1998) 162-166 1520-6106 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
American Chemical Society |
publisher.none.fl_str_mv |
American Chemical Society |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799133904720887808 |