Oscillatory instabilities during the electrocatalytic oxidation of methanol on platinum

Detalhes bibliográficos
Autor(a) principal: Martins,Andre L.
Data de Publicação: 2008
Outros Autores: Batista,Bruno C., Sitta,Elton, Varela,Hamilton
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=S0103-50532008000400011
Resumo: It is described in this paper the experimental observation of oscillatory dynamics during the electrocatalytic oxidation of methanol on platinum. Besides the previously reported potential oscillations, current oscillations obtained under potentiostatic control are also presented. The existence region of current oscillations is mapped in an applied voltage x resistance bifurcation diagram. Conjointly with electrochemical investigations, in situ FTIR spectroscopy was also employed in the present studies. Although we were not able to follow eventual intermediate coverage changes during the oscillations, those experiments revealled that the mean coverage of adsorbed carbon monoxide remains appreciably high along the oscillations. Results are discussed and compared with the oscillations observed in the electrooxidation of formic acid, a system whose behavior is more understood and widely supported by in situ spectroscopic data.
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spelling Oscillatory instabilities during the electrocatalytic oxidation of methanol on platinumcurrent and potential oscillationsmethanolelectrocatalysisin situ FTIRIt is described in this paper the experimental observation of oscillatory dynamics during the electrocatalytic oxidation of methanol on platinum. Besides the previously reported potential oscillations, current oscillations obtained under potentiostatic control are also presented. The existence region of current oscillations is mapped in an applied voltage x resistance bifurcation diagram. Conjointly with electrochemical investigations, in situ FTIR spectroscopy was also employed in the present studies. Although we were not able to follow eventual intermediate coverage changes during the oscillations, those experiments revealled that the mean coverage of adsorbed carbon monoxide remains appreciably high along the oscillations. Results are discussed and compared with the oscillations observed in the electrooxidation of formic acid, a system whose behavior is more understood and widely supported by in situ spectroscopic data.Sociedade Brasileira de Química2008-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532008000400011Journal of the Brazilian Chemical Society v.19 n.4 2008reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532008000400011info:eu-repo/semantics/openAccessMartins,Andre L.Batista,Bruno C.Sitta,EltonVarela,Hamiltoneng2008-06-11T00:00:00Zoai:scielo:S0103-50532008000400011Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2008-06-11T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Oscillatory instabilities during the electrocatalytic oxidation of methanol on platinum
title Oscillatory instabilities during the electrocatalytic oxidation of methanol on platinum
spellingShingle Oscillatory instabilities during the electrocatalytic oxidation of methanol on platinum
Martins,Andre L.
current and potential oscillations
methanol
electrocatalysis
in situ FTIR
title_short Oscillatory instabilities during the electrocatalytic oxidation of methanol on platinum
title_full Oscillatory instabilities during the electrocatalytic oxidation of methanol on platinum
title_fullStr Oscillatory instabilities during the electrocatalytic oxidation of methanol on platinum
title_full_unstemmed Oscillatory instabilities during the electrocatalytic oxidation of methanol on platinum
title_sort Oscillatory instabilities during the electrocatalytic oxidation of methanol on platinum
author Martins,Andre L.
author_facet Martins,Andre L.
Batista,Bruno C.
Sitta,Elton
Varela,Hamilton
author_role author
author2 Batista,Bruno C.
Sitta,Elton
Varela,Hamilton
author2_role author
author
author
dc.contributor.author.fl_str_mv Martins,Andre L.
Batista,Bruno C.
Sitta,Elton
Varela,Hamilton
dc.subject.por.fl_str_mv current and potential oscillations
methanol
electrocatalysis
in situ FTIR
topic current and potential oscillations
methanol
electrocatalysis
in situ FTIR
description It is described in this paper the experimental observation of oscillatory dynamics during the electrocatalytic oxidation of methanol on platinum. Besides the previously reported potential oscillations, current oscillations obtained under potentiostatic control are also presented. The existence region of current oscillations is mapped in an applied voltage x resistance bifurcation diagram. Conjointly with electrochemical investigations, in situ FTIR spectroscopy was also employed in the present studies. Although we were not able to follow eventual intermediate coverage changes during the oscillations, those experiments revealled that the mean coverage of adsorbed carbon monoxide remains appreciably high along the oscillations. Results are discussed and compared with the oscillations observed in the electrooxidation of formic acid, a system whose behavior is more understood and widely supported by in situ spectroscopic data.
publishDate 2008
dc.date.none.fl_str_mv 2008-01-01
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=S0103-50532008000400011
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532008000400011
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-50532008000400011
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.19 n.4 2008
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
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