Aspects of the Influence of Light on the Adsorption and Electrooxidation of Allyl Alcohol on Pt/Pt Electrodes in Perchloric Acid Solutions
Autor(a) principal: | |
---|---|
Data de Publicação: | 1998 |
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=S0103-50531998000500012 |
Resumo: | The electrooxidation of the adsorbed species produced by allyl alcohol adsorption on platinized platinum electrode has been studied in 1.0 M HClO4 medium. The maximum amount of adsorbed intermediates formed during allyl alcohol adsorption on the electrode surface, was observed at the adsorption potential, Eads = 0.00 V (SCE). Chronoamperometric studies at this potential confirm that the current associated with the hydrogen adsorption process decreases in the presence of the organic compound. Allyl alcohol displaces adsorbed hydrogen at the active sites. The incidence of polychromatic light on the electrode improves this effect as shown by comparison with the same experiments in the darkness. However, the electrooxidation of the adsorbed species comprise a monoelectronic charge transfer step. The anodic current associated with this process was higher under illumination than in the dark. This difference was attributed to a light-induced effect: either on the adsorption process of allyl alcohol on Pt/Pt, or on the electrooxidation of the adsorbed species. The electrooxidation of the adsorbed species formed during allyl alcohol adsorption demands apparent activation energies equivalent to 33.3 kJ mol-1 and 24.9 kJ mol-1 in the dark and under illumination, respectively. |
id |
SBQ-2_1c5a456c75a1f870871a610aab3a1770 |
---|---|
oai_identifier_str |
oai:scielo:S0103-50531998000500012 |
network_acronym_str |
SBQ-2 |
network_name_str |
Journal of the Brazilian Chemical Society (Online) |
repository_id_str |
|
spelling |
Aspects of the Influence of Light on the Adsorption and Electrooxidation of Allyl Alcohol on Pt/Pt Electrodes in Perchloric Acid Solutionsallyl alcoholphoto-effectselectrooxidationadsorptionplatinum platinized electrodeThe electrooxidation of the adsorbed species produced by allyl alcohol adsorption on platinized platinum electrode has been studied in 1.0 M HClO4 medium. The maximum amount of adsorbed intermediates formed during allyl alcohol adsorption on the electrode surface, was observed at the adsorption potential, Eads = 0.00 V (SCE). Chronoamperometric studies at this potential confirm that the current associated with the hydrogen adsorption process decreases in the presence of the organic compound. Allyl alcohol displaces adsorbed hydrogen at the active sites. The incidence of polychromatic light on the electrode improves this effect as shown by comparison with the same experiments in the darkness. However, the electrooxidation of the adsorbed species comprise a monoelectronic charge transfer step. The anodic current associated with this process was higher under illumination than in the dark. This difference was attributed to a light-induced effect: either on the adsorption process of allyl alcohol on Pt/Pt, or on the electrooxidation of the adsorbed species. The electrooxidation of the adsorbed species formed during allyl alcohol adsorption demands apparent activation energies equivalent to 33.3 kJ mol-1 and 24.9 kJ mol-1 in the dark and under illumination, respectively.Sociedade Brasileira de Química1998-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531998000500012Journal of the Brazilian Chemical Society v.9 n.5 1998reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50531998000500012info:eu-repo/semantics/openAccessBarin,Claudia SmaniottoGonçalves,Reinaldo Simõeseng2002-11-06T00:00:00Zoai:scielo:S0103-50531998000500012Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2002-11-06T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Aspects of the Influence of Light on the Adsorption and Electrooxidation of Allyl Alcohol on Pt/Pt Electrodes in Perchloric Acid Solutions |
title |
Aspects of the Influence of Light on the Adsorption and Electrooxidation of Allyl Alcohol on Pt/Pt Electrodes in Perchloric Acid Solutions |
spellingShingle |
Aspects of the Influence of Light on the Adsorption and Electrooxidation of Allyl Alcohol on Pt/Pt Electrodes in Perchloric Acid Solutions Barin,Claudia Smaniotto allyl alcohol photo-effects electrooxidation adsorption platinum platinized electrode |
title_short |
Aspects of the Influence of Light on the Adsorption and Electrooxidation of Allyl Alcohol on Pt/Pt Electrodes in Perchloric Acid Solutions |
title_full |
Aspects of the Influence of Light on the Adsorption and Electrooxidation of Allyl Alcohol on Pt/Pt Electrodes in Perchloric Acid Solutions |
title_fullStr |
Aspects of the Influence of Light on the Adsorption and Electrooxidation of Allyl Alcohol on Pt/Pt Electrodes in Perchloric Acid Solutions |
title_full_unstemmed |
Aspects of the Influence of Light on the Adsorption and Electrooxidation of Allyl Alcohol on Pt/Pt Electrodes in Perchloric Acid Solutions |
title_sort |
Aspects of the Influence of Light on the Adsorption and Electrooxidation of Allyl Alcohol on Pt/Pt Electrodes in Perchloric Acid Solutions |
author |
Barin,Claudia Smaniotto |
author_facet |
Barin,Claudia Smaniotto Gonçalves,Reinaldo Simões |
author_role |
author |
author2 |
Gonçalves,Reinaldo Simões |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Barin,Claudia Smaniotto Gonçalves,Reinaldo Simões |
dc.subject.por.fl_str_mv |
allyl alcohol photo-effects electrooxidation adsorption platinum platinized electrode |
topic |
allyl alcohol photo-effects electrooxidation adsorption platinum platinized electrode |
description |
The electrooxidation of the adsorbed species produced by allyl alcohol adsorption on platinized platinum electrode has been studied in 1.0 M HClO4 medium. The maximum amount of adsorbed intermediates formed during allyl alcohol adsorption on the electrode surface, was observed at the adsorption potential, Eads = 0.00 V (SCE). Chronoamperometric studies at this potential confirm that the current associated with the hydrogen adsorption process decreases in the presence of the organic compound. Allyl alcohol displaces adsorbed hydrogen at the active sites. The incidence of polychromatic light on the electrode improves this effect as shown by comparison with the same experiments in the darkness. However, the electrooxidation of the adsorbed species comprise a monoelectronic charge transfer step. The anodic current associated with this process was higher under illumination than in the dark. This difference was attributed to a light-induced effect: either on the adsorption process of allyl alcohol on Pt/Pt, or on the electrooxidation of the adsorbed species. The electrooxidation of the adsorbed species formed during allyl alcohol adsorption demands apparent activation energies equivalent to 33.3 kJ mol-1 and 24.9 kJ mol-1 in the dark and under illumination, respectively. |
publishDate |
1998 |
dc.date.none.fl_str_mv |
1998-09-01 |
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=S0103-50531998000500012 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531998000500012 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-50531998000500012 |
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.9 n.5 1998 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_ |
1750318163436765184 |