Estimating the Electrochemically Active Area: Revisiting a Basic Concept in Electrochemistry
Main Author: | |
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Publication Date: | 2021 |
Other Authors: | , |
Format: | Article |
Language: | eng |
Source: | Journal of the Brazilian Chemical Society (Online) |
Download full: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532021001001912 |
Summary: | The well-known electrochemical probe Fe(CN)63-/Fe(CN)64- is widely used for estimating the electrochemically active area of electrodes modified with carbon nanotubes, conductive polymers, enzymes, etc. In this study, we used the platinum electrode, smooth or platinized with different roughness factors, to demonstrate that such a redox couple fails to respond to a surface roughness variation. We determined the roughness factors of the Pt surfaces by atomic force microscopy (AFM) images, which yielded values between 2.72 and 25.91. Almost the same values were found by using the charge of the hydrogen monolayer desorption obtained from steady-state cyclic voltammetry experiments performed in an acid medium. They were then compared with those provided by peak current in voltammetry or chronoamperometry with Fe(CN)63-/Fe(CN)64- which all yielded values nearly to one. Such comparison demonstrates that the electrochemical behavior of the redox probe is an outer sphere reaction with a quite small interaction with the electrode surface, thus not being suitable to be related with active areas. |
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Estimating the Electrochemically Active Area: Revisiting a Basic Concept in Electrochemistryelectrochemical areapotassium ferrocyanideelectrode areacyclic voltammetrychronoamperometryThe well-known electrochemical probe Fe(CN)63-/Fe(CN)64- is widely used for estimating the electrochemically active area of electrodes modified with carbon nanotubes, conductive polymers, enzymes, etc. In this study, we used the platinum electrode, smooth or platinized with different roughness factors, to demonstrate that such a redox couple fails to respond to a surface roughness variation. We determined the roughness factors of the Pt surfaces by atomic force microscopy (AFM) images, which yielded values between 2.72 and 25.91. Almost the same values were found by using the charge of the hydrogen monolayer desorption obtained from steady-state cyclic voltammetry experiments performed in an acid medium. They were then compared with those provided by peak current in voltammetry or chronoamperometry with Fe(CN)63-/Fe(CN)64- which all yielded values nearly to one. Such comparison demonstrates that the electrochemical behavior of the redox probe is an outer sphere reaction with a quite small interaction with the electrode surface, thus not being suitable to be related with active areas.Sociedade Brasileira de Química2021-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532021001001912Journal of the Brazilian Chemical Society v.32 n.10 2021reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.21577/0103-5053.20210080info:eu-repo/semantics/openAccessCoelho,DyovaniLuiz,Giuliana M.Machado,Sergio A. S.eng2021-09-28T00:00:00Zoai:scielo:S0103-50532021001001912Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2021-09-28T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Estimating the Electrochemically Active Area: Revisiting a Basic Concept in Electrochemistry |
title |
Estimating the Electrochemically Active Area: Revisiting a Basic Concept in Electrochemistry |
spellingShingle |
Estimating the Electrochemically Active Area: Revisiting a Basic Concept in Electrochemistry Coelho,Dyovani electrochemical area potassium ferrocyanide electrode area cyclic voltammetry chronoamperometry |
title_short |
Estimating the Electrochemically Active Area: Revisiting a Basic Concept in Electrochemistry |
title_full |
Estimating the Electrochemically Active Area: Revisiting a Basic Concept in Electrochemistry |
title_fullStr |
Estimating the Electrochemically Active Area: Revisiting a Basic Concept in Electrochemistry |
title_full_unstemmed |
Estimating the Electrochemically Active Area: Revisiting a Basic Concept in Electrochemistry |
title_sort |
Estimating the Electrochemically Active Area: Revisiting a Basic Concept in Electrochemistry |
author |
Coelho,Dyovani |
author_facet |
Coelho,Dyovani Luiz,Giuliana M. Machado,Sergio A. S. |
author_role |
author |
author2 |
Luiz,Giuliana M. Machado,Sergio A. S. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Coelho,Dyovani Luiz,Giuliana M. Machado,Sergio A. S. |
dc.subject.por.fl_str_mv |
electrochemical area potassium ferrocyanide electrode area cyclic voltammetry chronoamperometry |
topic |
electrochemical area potassium ferrocyanide electrode area cyclic voltammetry chronoamperometry |
description |
The well-known electrochemical probe Fe(CN)63-/Fe(CN)64- is widely used for estimating the electrochemically active area of electrodes modified with carbon nanotubes, conductive polymers, enzymes, etc. In this study, we used the platinum electrode, smooth or platinized with different roughness factors, to demonstrate that such a redox couple fails to respond to a surface roughness variation. We determined the roughness factors of the Pt surfaces by atomic force microscopy (AFM) images, which yielded values between 2.72 and 25.91. Almost the same values were found by using the charge of the hydrogen monolayer desorption obtained from steady-state cyclic voltammetry experiments performed in an acid medium. They were then compared with those provided by peak current in voltammetry or chronoamperometry with Fe(CN)63-/Fe(CN)64- which all yielded values nearly to one. Such comparison demonstrates that the electrochemical behavior of the redox probe is an outer sphere reaction with a quite small interaction with the electrode surface, thus not being suitable to be related with active areas. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-10-01 |
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=S0103-50532021001001912 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532021001001912 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.21577/0103-5053.20210080 |
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.32 n.10 2021 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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1750318184438693888 |