Influence of the electrolyte composition on the kinetics of the oxygen evolution reaction and ozone production processes
Autor(a) principal: | |
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Data de Publicação: | 2006 |
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=S0103-50532006000400017 |
Resumo: | The influence of electrolyte composition (pure sulphuric or perchloric acid and their mixtures) on the kinetics of the oxygen evolution reaction (OER) and the electrochemical ozone production (EOP) on beta-PbO2 electrodes was investigated by electrochemical impedance spectroscopy and quasi-stationary polarisation curves. Analysis of the impedance spectra revealed a dependency of the electric double layer capacity and the adsorption pseudocapacitance, due to reaction intermediates, on electrolyte composition. The pseudocapacitance is a function of electrode potential and electrolyte composition, indicating the surface coverage by the reaction intermediates depends on these parameters. Tafel slope data support primary water discharge as rate determining step of the OER and EOP electrode processes. EOP current efficiency data (phiEOP) show pure electrolytes lead to maximum O3 production when compared to mixed electrolytes. According to the theoretical analysis of the electrode mechanism, this behaviour is a consequence of the reduction in surface concentration of the active centres leading to EOP caused by anion adsorption. |
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Journal of the Brazilian Chemical Society (Online) |
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Influence of the electrolyte composition on the kinetics of the oxygen evolution reaction and ozone production processesimpedance spectroscopyozone productionoxygen evolutionkineticsmixed electrolytesThe influence of electrolyte composition (pure sulphuric or perchloric acid and their mixtures) on the kinetics of the oxygen evolution reaction (OER) and the electrochemical ozone production (EOP) on beta-PbO2 electrodes was investigated by electrochemical impedance spectroscopy and quasi-stationary polarisation curves. Analysis of the impedance spectra revealed a dependency of the electric double layer capacity and the adsorption pseudocapacitance, due to reaction intermediates, on electrolyte composition. The pseudocapacitance is a function of electrode potential and electrolyte composition, indicating the surface coverage by the reaction intermediates depends on these parameters. Tafel slope data support primary water discharge as rate determining step of the OER and EOP electrode processes. EOP current efficiency data (phiEOP) show pure electrolytes lead to maximum O3 production when compared to mixed electrolytes. According to the theoretical analysis of the electrode mechanism, this behaviour is a consequence of the reduction in surface concentration of the active centres leading to EOP caused by anion adsorption.Sociedade Brasileira de Química2006-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000400017Journal of the Brazilian Chemical Society v.17 n.4 2006reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532006000400017info:eu-repo/semantics/openAccessFranco,Débora V.Silva,Leonardo M. DaJardim,Wilson F.Boodts,Julien F. C.eng2006-08-25T00:00:00Zoai:scielo:S0103-50532006000400017Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2006-08-25T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Influence of the electrolyte composition on the kinetics of the oxygen evolution reaction and ozone production processes |
title |
Influence of the electrolyte composition on the kinetics of the oxygen evolution reaction and ozone production processes |
spellingShingle |
Influence of the electrolyte composition on the kinetics of the oxygen evolution reaction and ozone production processes Franco,Débora V. impedance spectroscopy ozone production oxygen evolution kinetics mixed electrolytes |
title_short |
Influence of the electrolyte composition on the kinetics of the oxygen evolution reaction and ozone production processes |
title_full |
Influence of the electrolyte composition on the kinetics of the oxygen evolution reaction and ozone production processes |
title_fullStr |
Influence of the electrolyte composition on the kinetics of the oxygen evolution reaction and ozone production processes |
title_full_unstemmed |
Influence of the electrolyte composition on the kinetics of the oxygen evolution reaction and ozone production processes |
title_sort |
Influence of the electrolyte composition on the kinetics of the oxygen evolution reaction and ozone production processes |
author |
Franco,Débora V. |
author_facet |
Franco,Débora V. Silva,Leonardo M. Da Jardim,Wilson F. Boodts,Julien F. C. |
author_role |
author |
author2 |
Silva,Leonardo M. Da Jardim,Wilson F. Boodts,Julien F. C. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Franco,Débora V. Silva,Leonardo M. Da Jardim,Wilson F. Boodts,Julien F. C. |
dc.subject.por.fl_str_mv |
impedance spectroscopy ozone production oxygen evolution kinetics mixed electrolytes |
topic |
impedance spectroscopy ozone production oxygen evolution kinetics mixed electrolytes |
description |
The influence of electrolyte composition (pure sulphuric or perchloric acid and their mixtures) on the kinetics of the oxygen evolution reaction (OER) and the electrochemical ozone production (EOP) on beta-PbO2 electrodes was investigated by electrochemical impedance spectroscopy and quasi-stationary polarisation curves. Analysis of the impedance spectra revealed a dependency of the electric double layer capacity and the adsorption pseudocapacitance, due to reaction intermediates, on electrolyte composition. The pseudocapacitance is a function of electrode potential and electrolyte composition, indicating the surface coverage by the reaction intermediates depends on these parameters. Tafel slope data support primary water discharge as rate determining step of the OER and EOP electrode processes. EOP current efficiency data (phiEOP) show pure electrolytes lead to maximum O3 production when compared to mixed electrolytes. According to the theoretical analysis of the electrode mechanism, this behaviour is a consequence of the reduction in surface concentration of the active centres leading to EOP caused by anion adsorption. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-08-01 |
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=S0103-50532006000400017 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000400017 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-50532006000400017 |
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.4 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 |
_version_ |
1750318167317544960 |