Nitrite electro-oxidation mediated by Co(II)-[tetra(4-aminophenyl)porphyrin]-modified electrodes: behavior as an amperometric sensor

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dc.contributor.authorRios, Roxana
dc.contributor.authorMarin, America
dc.contributor.authorRamirez, Galo
dc.date.accessioned2024-01-10T12:40:51Z
dc.date.available2024-01-10T12:40:51Z
dc.date.issued2010
dc.description.abstractElectro-oxidation of nitrite mediated by Co(II)-[tetra(4-aminophenyl)porphyrin]-modified electrodes (4-CoTAPP) is presented in this article. Catalytic activity of electrodes modified with porphyrin polymeric films (poly-4-CoTAPP) and with multilayer of monomers (m-4-CoTAPP) for the oxidation of nitrite was compared. The number of cycles for the electrosynthesis of poly-4-CoTAPP determines the activity of the electrode toward nitrite oxidation because the system loses its catalytic activity as the number of polymerization cycles increases above 15. The effect of pH on activity is also reported. The response for the nitrite oxidation of electrodes modified with 4-CoTAPP and with metal-free ligand, that is, tetra(4-aminophenyl)porphyrin, either as multilayer of monomers or as polymer (m-4-H2TAPP and poly-4-H2TAPP, respectively), was compared. An increase of activity in the presence of the metal was found. Furthermore, when the device was tested as an amperometric sensor for different nitrite concentrations under the optimum working conditions, only poly-4-CoTAPP exhibited a linear response throughout the concentration range studied with a reasonably low limit of detection, while m-4-CoTAPP and poly-H2TAPP systems have no linear response throughout the range of concentration. Finally, the number of electrons involved and the Tafel slope for the reaction were estimated.
dc.description.funderFondecyt-Inicio (Chile)
dc.description.funderConicyt
dc.fechaingreso.objetodigital2024-05-06
dc.format.extent12 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1080/00958971003802091
dc.identifier.eissn1029-0389
dc.identifier.issn0095-8972
dc.identifier.urihttps://doi.org/10.1080/00958971003802091
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/77356
dc.identifier.wosidWOS:000277737700001
dc.information.autorucQuímica;Ramírez G;S/I;191811
dc.issue.numero8
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final1294
dc.pagina.inicio1283
dc.publisherTAYLOR & FRANCIS LTD
dc.revistaJOURNAL OF COORDINATION CHEMISTRY
dc.rightsacceso restringido
dc.subjectNitrite electro-oxidation
dc.subjectModified electrodes
dc.subjectAmperometric sensor
dc.subjectPorphyrins
dc.subjectElectrocatalysis
dc.subjectCHEMICALLY-MODIFIED ELECTRODES
dc.subjectFLOW-INJECTION DETERMINATION
dc.subjectGLASSY-CARBON ELECTRODE
dc.subjectELECTROCATALYTIC OXIDATION
dc.subjectELECTROCHEMICAL REDUCTION
dc.subjectPORPHYRIN
dc.subjectNITRATE
dc.subjectOXIDE
dc.subjectCU
dc.titleNitrite electro-oxidation mediated by Co(II)-[tetra(4-aminophenyl)porphyrin]-modified electrodes: behavior as an amperometric sensor
dc.typeartículo
dc.volumen63
sipa.codpersvinculados191811
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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