Studies of nickel electrocrystallization on platinum ultramicroelectrodes
Autor(a) principal: | |
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Data de Publicação: | 1997 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Journal of the Brazilian Chemical Society (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531997000100013 |
Resumo: | The electrocrystallization of nickel was studied on a platinum ultramicroelectrode (UME). The behaviour of the current transients pointed to an instantaneous nucleation process under kinetic control. The application of Abyaneh's model showed that nuclei grow in a spherical cap geometry with different values for both rate constants in the parallel and perpendicular directions. The parallel rate constants for nuclei growth varied from 5.97 x 10-7 to 1.92 x 10-7 mol cm-2 s-1 by increasing the step potential from -0.57 to -0.63 V, while the perpendicular rate constant remained constant around 1.44 x 10-7 mol cm-2 s-1. The relationships between these two constants give the contact angles of the crystallites, whose values also increased with potential from 27.5 to 87.6 degrees. Finally, the number of nuclei formed on the surface increased with potential from 0.43 x 10(7) to 379.09 x 10(7) cm-2. |
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Studies of nickel electrocrystallization on platinum ultramicroelectrodeselectrocrystallizationspherical capsultramicroelectrodesnickelThe electrocrystallization of nickel was studied on a platinum ultramicroelectrode (UME). The behaviour of the current transients pointed to an instantaneous nucleation process under kinetic control. The application of Abyaneh's model showed that nuclei grow in a spherical cap geometry with different values for both rate constants in the parallel and perpendicular directions. The parallel rate constants for nuclei growth varied from 5.97 x 10-7 to 1.92 x 10-7 mol cm-2 s-1 by increasing the step potential from -0.57 to -0.63 V, while the perpendicular rate constant remained constant around 1.44 x 10-7 mol cm-2 s-1. The relationships between these two constants give the contact angles of the crystallites, whose values also increased with potential from 27.5 to 87.6 degrees. Finally, the number of nuclei formed on the surface increased with potential from 0.43 x 10(7) to 379.09 x 10(7) cm-2.Sociedade Brasileira de Química1997-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531997000100013Journal of the Brazilian Chemical Society v.8 n.1 1997reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50531997000100013info:eu-repo/semantics/openAccessCorreia,A.N.Machado,S.A.S.eng2011-10-04T00:00:00Zoai:scielo:S0103-50531997000100013Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2011-10-04T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Studies of nickel electrocrystallization on platinum ultramicroelectrodes |
title |
Studies of nickel electrocrystallization on platinum ultramicroelectrodes |
spellingShingle |
Studies of nickel electrocrystallization on platinum ultramicroelectrodes Correia,A.N. electrocrystallization spherical caps ultramicroelectrodes nickel |
title_short |
Studies of nickel electrocrystallization on platinum ultramicroelectrodes |
title_full |
Studies of nickel electrocrystallization on platinum ultramicroelectrodes |
title_fullStr |
Studies of nickel electrocrystallization on platinum ultramicroelectrodes |
title_full_unstemmed |
Studies of nickel electrocrystallization on platinum ultramicroelectrodes |
title_sort |
Studies of nickel electrocrystallization on platinum ultramicroelectrodes |
author |
Correia,A.N. |
author_facet |
Correia,A.N. Machado,S.A.S. |
author_role |
author |
author2 |
Machado,S.A.S. |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Correia,A.N. Machado,S.A.S. |
dc.subject.por.fl_str_mv |
electrocrystallization spherical caps ultramicroelectrodes nickel |
topic |
electrocrystallization spherical caps ultramicroelectrodes nickel |
description |
The electrocrystallization of nickel was studied on a platinum ultramicroelectrode (UME). The behaviour of the current transients pointed to an instantaneous nucleation process under kinetic control. The application of Abyaneh's model showed that nuclei grow in a spherical cap geometry with different values for both rate constants in the parallel and perpendicular directions. The parallel rate constants for nuclei growth varied from 5.97 x 10-7 to 1.92 x 10-7 mol cm-2 s-1 by increasing the step potential from -0.57 to -0.63 V, while the perpendicular rate constant remained constant around 1.44 x 10-7 mol cm-2 s-1. The relationships between these two constants give the contact angles of the crystallites, whose values also increased with potential from 27.5 to 87.6 degrees. Finally, the number of nuclei formed on the surface increased with potential from 0.43 x 10(7) to 379.09 x 10(7) cm-2. |
publishDate |
1997 |
dc.date.none.fl_str_mv |
1997-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531997000100013 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531997000100013 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-50531997000100013 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
dc.source.none.fl_str_mv |
Journal of the Brazilian Chemical Society v.8 n.1 1997 reponame:Journal of the Brazilian Chemical Society (Online) instname:Sociedade Brasileira de Química (SBQ) instacron:SBQ |
instname_str |
Sociedade Brasileira de Química (SBQ) |
instacron_str |
SBQ |
institution |
SBQ |
reponame_str |
Journal of the Brazilian Chemical Society (Online) |
collection |
Journal of the Brazilian Chemical Society (Online) |
repository.name.fl_str_mv |
Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ) |
repository.mail.fl_str_mv |
||office@jbcs.sbq.org.br |
_version_ |
1750318162982731776 |