Oxygen Reduction on Iron-Melanin Granular Surfaces

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We report the catalytic activity of iron-eumelanin granular deposits supported on graphite for the oxygen reduction in neutral and alkaline solutions. These deposits contain quinone groups and iron-melanin complexes as revealed by XPS, XANES, EXAFS, and IR spectroscopy. Voltammetric data show that t...

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Autores principales: González Orive, Alejandro, Hernández Creus, Alberto, Grumelli, Doris Elda, Benitez, Guillermo Alfredo, Andrini, Leandro Rubén, Requejo, Félix Gregorio, Bonazzola, Cecilia, Salvarezza, Roberto Carlos
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Física
Química
deposition
electrochemical reduction
oxides
oxygen
redox reactions
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/162896
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-162896
record_format dspace
spelling I19-R120-10915-1628962024-02-20T20:09:47Z http://sedici.unlp.edu.ar/handle/10915/162896 Oxygen Reduction on Iron-Melanin Granular Surfaces González Orive, Alejandro Hernández Creus, Alberto Grumelli, Doris Elda Benitez, Guillermo Alfredo Andrini, Leandro Rubén Requejo, Félix Gregorio Bonazzola, Cecilia Salvarezza, Roberto Carlos 2009 2024-02-20T14:07:11Z en Física Química deposition electrochemical reduction oxides oxygen redox reactions We report the catalytic activity of iron-eumelanin granular deposits supported on graphite for the oxygen reduction in neutral and alkaline solutions. These deposits contain quinone groups and iron-melanin complexes as revealed by XPS, XANES, EXAFS, and IR spectroscopy. Voltammetric data show that the iron-eumelanin system exhibits higher electrocatalytic activity than quinone/hydroquinone films (Q/QH) on the same substrate. In contrast to Q/QH deposits, the iron-containing eumelanin system is able to reduce oxygen with transfer of four electrons, thus allowing the formation of reactive hydroxyl species. Our results can explain the physical chemistry basis of the oxygen-radical induced lipid peroxidation and consequent neurodegeneration of the melanin-containing dopaminergic neurons observed by several authors. Facultad de Ciencias Exactas Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf 17097-17103
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Química
deposition
electrochemical reduction
oxides
oxygen
redox reactions
spellingShingle Física
Química
deposition
electrochemical reduction
oxides
oxygen
redox reactions
González Orive, Alejandro
Hernández Creus, Alberto
Grumelli, Doris Elda
Benitez, Guillermo Alfredo
Andrini, Leandro Rubén
Requejo, Félix Gregorio
Bonazzola, Cecilia
Salvarezza, Roberto Carlos
Oxygen Reduction on Iron-Melanin Granular Surfaces
topic_facet Física
Química
deposition
electrochemical reduction
oxides
oxygen
redox reactions
description We report the catalytic activity of iron-eumelanin granular deposits supported on graphite for the oxygen reduction in neutral and alkaline solutions. These deposits contain quinone groups and iron-melanin complexes as revealed by XPS, XANES, EXAFS, and IR spectroscopy. Voltammetric data show that the iron-eumelanin system exhibits higher electrocatalytic activity than quinone/hydroquinone films (Q/QH) on the same substrate. In contrast to Q/QH deposits, the iron-containing eumelanin system is able to reduce oxygen with transfer of four electrons, thus allowing the formation of reactive hydroxyl species. Our results can explain the physical chemistry basis of the oxygen-radical induced lipid peroxidation and consequent neurodegeneration of the melanin-containing dopaminergic neurons observed by several authors.
format Articulo
Articulo
author González Orive, Alejandro
Hernández Creus, Alberto
Grumelli, Doris Elda
Benitez, Guillermo Alfredo
Andrini, Leandro Rubén
Requejo, Félix Gregorio
Bonazzola, Cecilia
Salvarezza, Roberto Carlos
author_facet González Orive, Alejandro
Hernández Creus, Alberto
Grumelli, Doris Elda
Benitez, Guillermo Alfredo
Andrini, Leandro Rubén
Requejo, Félix Gregorio
Bonazzola, Cecilia
Salvarezza, Roberto Carlos
author_sort González Orive, Alejandro
title Oxygen Reduction on Iron-Melanin Granular Surfaces
title_short Oxygen Reduction on Iron-Melanin Granular Surfaces
title_full Oxygen Reduction on Iron-Melanin Granular Surfaces
title_fullStr Oxygen Reduction on Iron-Melanin Granular Surfaces
title_full_unstemmed Oxygen Reduction on Iron-Melanin Granular Surfaces
title_sort oxygen reduction on iron-melanin granular surfaces
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/162896
work_keys_str_mv AT gonzalezorivealejandro oxygenreductiononironmelaningranularsurfaces
AT hernandezcreusalberto oxygenreductiononironmelaningranularsurfaces
AT grumellidoriselda oxygenreductiononironmelaningranularsurfaces
AT benitezguillermoalfredo oxygenreductiononironmelaningranularsurfaces
AT andrinileandroruben oxygenreductiononironmelaningranularsurfaces
AT requejofelixgregorio oxygenreductiononironmelaningranularsurfaces
AT bonazzolacecilia oxygenreductiononironmelaningranularsurfaces
AT salvarezzarobertocarlos oxygenreductiononironmelaningranularsurfaces
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