Oxygen reduction at a manganate electrocatalyst in KOH solutions

Detalhes bibliográficos
Autor(a) principal: Sequeira,César A. C.
Data de Publicação: 2006
Outros Autores: Santos,Diogo M. F., Baptista,Walmar
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=S0103-50532006000500014
Resumo: The electrocatalysis of the oxygen reduction reaction by lanthanum calcium manganate, (La0.5Ca0.5MnO3) (LCM) has been studied by cyclic voltammetry using the rotating ring-disc electrode technique (RRDE) in alkaline medium. From the ring-disc data and other kinetic parameters it has been assumed that the oxygen reduction occurs by dissociative chemisorption at low overpotentials. At higher overpotentials, the formation of hydrogen peroxide (HO2- in this case) has been observed on this electrocatalyst. The apparent exchange current density value for oxygen reduction on LCM has been found to be 5 <FONT FACE=Symbol>´</FONT> 10-8 A cm-2, while the corresponding Tafel slope is 0.115 V per decade. The possible reaction mechanism for electroreduction of oxygen on this oxide catalyst has been discussed.
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spelling Oxygen reduction at a manganate electrocatalyst in KOH solutionsfuel cellmetal-air batterylanthanum calcium manganateoxygen reductionHO2- disproportionationThe electrocatalysis of the oxygen reduction reaction by lanthanum calcium manganate, (La0.5Ca0.5MnO3) (LCM) has been studied by cyclic voltammetry using the rotating ring-disc electrode technique (RRDE) in alkaline medium. From the ring-disc data and other kinetic parameters it has been assumed that the oxygen reduction occurs by dissociative chemisorption at low overpotentials. At higher overpotentials, the formation of hydrogen peroxide (HO2- in this case) has been observed on this electrocatalyst. The apparent exchange current density value for oxygen reduction on LCM has been found to be 5 <FONT FACE=Symbol>´</FONT> 10-8 A cm-2, while the corresponding Tafel slope is 0.115 V per decade. The possible reaction mechanism for electroreduction of oxygen on this oxide catalyst has been discussed.Sociedade Brasileira de Química2006-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000500014Journal of the Brazilian Chemical Society v.17 n.5 2006reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532006000500014info:eu-repo/semantics/openAccessSequeira,César A. C.Santos,Diogo M. F.Baptista,Walmareng2006-12-01T00:00:00Zoai:scielo:S0103-50532006000500014Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2006-12-01T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Oxygen reduction at a manganate electrocatalyst in KOH solutions
title Oxygen reduction at a manganate electrocatalyst in KOH solutions
spellingShingle Oxygen reduction at a manganate electrocatalyst in KOH solutions
Sequeira,César A. C.
fuel cell
metal-air battery
lanthanum calcium manganate
oxygen reduction
HO2- disproportionation
title_short Oxygen reduction at a manganate electrocatalyst in KOH solutions
title_full Oxygen reduction at a manganate electrocatalyst in KOH solutions
title_fullStr Oxygen reduction at a manganate electrocatalyst in KOH solutions
title_full_unstemmed Oxygen reduction at a manganate electrocatalyst in KOH solutions
title_sort Oxygen reduction at a manganate electrocatalyst in KOH solutions
author Sequeira,César A. C.
author_facet Sequeira,César A. C.
Santos,Diogo M. F.
Baptista,Walmar
author_role author
author2 Santos,Diogo M. F.
Baptista,Walmar
author2_role author
author
dc.contributor.author.fl_str_mv Sequeira,César A. C.
Santos,Diogo M. F.
Baptista,Walmar
dc.subject.por.fl_str_mv fuel cell
metal-air battery
lanthanum calcium manganate
oxygen reduction
HO2- disproportionation
topic fuel cell
metal-air battery
lanthanum calcium manganate
oxygen reduction
HO2- disproportionation
description The electrocatalysis of the oxygen reduction reaction by lanthanum calcium manganate, (La0.5Ca0.5MnO3) (LCM) has been studied by cyclic voltammetry using the rotating ring-disc electrode technique (RRDE) in alkaline medium. From the ring-disc data and other kinetic parameters it has been assumed that the oxygen reduction occurs by dissociative chemisorption at low overpotentials. At higher overpotentials, the formation of hydrogen peroxide (HO2- in this case) has been observed on this electrocatalyst. The apparent exchange current density value for oxygen reduction on LCM has been found to be 5 <FONT FACE=Symbol>´</FONT> 10-8 A cm-2, while the corresponding Tafel slope is 0.115 V per decade. The possible reaction mechanism for electroreduction of oxygen on this oxide catalyst has been discussed.
publishDate 2006
dc.date.none.fl_str_mv 2006-10-01
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=S0103-50532006000500014
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000500014
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-50532006000500014
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.17 n.5 2006
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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