Voltammetric response of hydrogen adsorbates on platinum in acid solutions: a possible H-adatom subsurface state

Detalhes bibliográficos
Autor(a) principal: Martins,M.E
Data de Publicação: 1997
Outros Autores: Zinola,C.F, Arvia,A.J
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=S0103-50531997000400008
Resumo: Combined potential routines involving voltammetric sweeps and potential holdings covering the H-adatom potential range were applied to Pt electrodes in different aqueous acid solutions to produce an enhancement of the "third" H-atom electrodesorption current peak at ca. 0.22 V vs. RHE. This peak can be observed for Pt electrodes of different topographies. Seemingly, the corresponding cathodic current contribution appears in a potential range slightly more positive than the hydrogen evolution reaction threshold potential. The peak potential difference related to the conjugated redox reactions is consistent with an appreciable irreversibility of the process. The small charge involved in this pair of peaks is expected from a subsurface and an interstitial H-adatom state on Pt. This type of structure has been predicted from quantum chemistry calculations.
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spelling Voltammetric response of hydrogen adsorbates on platinum in acid solutions: a possible H-adatom subsurface stateplatinum electrodeshydrogen evolutionH-adatomsthird H-adatom current peakCombined potential routines involving voltammetric sweeps and potential holdings covering the H-adatom potential range were applied to Pt electrodes in different aqueous acid solutions to produce an enhancement of the "third" H-atom electrodesorption current peak at ca. 0.22 V vs. RHE. This peak can be observed for Pt electrodes of different topographies. Seemingly, the corresponding cathodic current contribution appears in a potential range slightly more positive than the hydrogen evolution reaction threshold potential. The peak potential difference related to the conjugated redox reactions is consistent with an appreciable irreversibility of the process. The small charge involved in this pair of peaks is expected from a subsurface and an interstitial H-adatom state on Pt. This type of structure has been predicted from quantum chemistry calculations.Sociedade Brasileira de Química1997-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531997000400008Journal of the Brazilian Chemical Society v.8 n.4 1997reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50531997000400008info:eu-repo/semantics/openAccessMartins,M.EZinola,C.FArvia,A.Jeng2010-12-01T00:00:00Zoai:scielo:S0103-50531997000400008Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2010-12-01T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Voltammetric response of hydrogen adsorbates on platinum in acid solutions: a possible H-adatom subsurface state
title Voltammetric response of hydrogen adsorbates on platinum in acid solutions: a possible H-adatom subsurface state
spellingShingle Voltammetric response of hydrogen adsorbates on platinum in acid solutions: a possible H-adatom subsurface state
Martins,M.E
platinum electrodes
hydrogen evolution
H-adatoms
third H-adatom current peak
title_short Voltammetric response of hydrogen adsorbates on platinum in acid solutions: a possible H-adatom subsurface state
title_full Voltammetric response of hydrogen adsorbates on platinum in acid solutions: a possible H-adatom subsurface state
title_fullStr Voltammetric response of hydrogen adsorbates on platinum in acid solutions: a possible H-adatom subsurface state
title_full_unstemmed Voltammetric response of hydrogen adsorbates on platinum in acid solutions: a possible H-adatom subsurface state
title_sort Voltammetric response of hydrogen adsorbates on platinum in acid solutions: a possible H-adatom subsurface state
author Martins,M.E
author_facet Martins,M.E
Zinola,C.F
Arvia,A.J
author_role author
author2 Zinola,C.F
Arvia,A.J
author2_role author
author
dc.contributor.author.fl_str_mv Martins,M.E
Zinola,C.F
Arvia,A.J
dc.subject.por.fl_str_mv platinum electrodes
hydrogen evolution
H-adatoms
third H-adatom current peak
topic platinum electrodes
hydrogen evolution
H-adatoms
third H-adatom current peak
description Combined potential routines involving voltammetric sweeps and potential holdings covering the H-adatom potential range were applied to Pt electrodes in different aqueous acid solutions to produce an enhancement of the "third" H-atom electrodesorption current peak at ca. 0.22 V vs. RHE. This peak can be observed for Pt electrodes of different topographies. Seemingly, the corresponding cathodic current contribution appears in a potential range slightly more positive than the hydrogen evolution reaction threshold potential. The peak potential difference related to the conjugated redox reactions is consistent with an appreciable irreversibility of the process. The small charge involved in this pair of peaks is expected from a subsurface and an interstitial H-adatom state on Pt. This type of structure has been predicted from quantum chemistry calculations.
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=S0103-50531997000400008
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531997000400008
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-50531997000400008
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.4 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
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