Oxygen Reduction on Iron-Melanin Granular Surfaces
- Autores
- González Orive, Alejandro; Hernández Creus, Alberto; Grumelli, Doris Elda; Benitez, Guillermo Alfredo; Andrini, Leandro Rubén; Requejo, Félix Gregorio; Bonazzola, Cecilia; Salvarezza, Roberto Carlos
- Año de publicación
- 2009
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- 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 - Materia
-
Física
Química
deposition
electrochemical reduction
oxides
oxygen
redox reactions - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by/4.0/
- Repositorio
.jpg)
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/162896
Ver los metadatos del registro completo
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Oxygen Reduction on Iron-Melanin Granular SurfacesGonzález Orive, AlejandroHernández Creus, AlbertoGrumelli, Doris EldaBenitez, Guillermo AlfredoAndrini, Leandro RubénRequejo, Félix GregorioBonazzola, CeciliaSalvarezza, Roberto CarlosFísicaQuímicadepositionelectrochemical reductionoxidesoxygenredox reactionsWe 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 ExactasInstituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas2009info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf17097-17103http://sedici.unlp.edu.ar/handle/10915/162896enginfo:eu-repo/semantics/altIdentifier/issn/1932-7447info:eu-repo/semantics/altIdentifier/issn/1932-7455info:eu-repo/semantics/altIdentifier/doi/10.1021/jp905560dinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-10T12:45:38Zoai:sedici.unlp.edu.ar:10915/162896Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-10 12:45:38.282SEDICI (UNLP) - Universidad Nacional de La Platafalse |
| dc.title.none.fl_str_mv |
Oxygen Reduction on Iron-Melanin Granular Surfaces |
| title |
Oxygen Reduction on Iron-Melanin Granular Surfaces |
| spellingShingle |
Oxygen Reduction on Iron-Melanin Granular Surfaces González Orive, Alejandro Física Química deposition electrochemical reduction oxides oxygen redox reactions |
| 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 |
| dc.creator.none.fl_str_mv |
González Orive, Alejandro Hernández Creus, Alberto Grumelli, Doris Elda Benitez, Guillermo Alfredo Andrini, Leandro Rubén Requejo, Félix Gregorio Bonazzola, Cecilia Salvarezza, Roberto Carlos |
| author |
González Orive, Alejandro |
| 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_role |
author |
| author2 |
Hernández Creus, Alberto Grumelli, Doris Elda Benitez, Guillermo Alfredo Andrini, Leandro Rubén Requejo, Félix Gregorio Bonazzola, Cecilia Salvarezza, Roberto Carlos |
| author2_role |
author author author author author author author |
| dc.subject.none.fl_str_mv |
Física Química deposition electrochemical reduction oxides oxygen redox reactions |
| topic |
Física Química deposition electrochemical reduction oxides oxygen redox reactions |
| dc.description.none.fl_txt_mv |
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 |
| 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. |
| publishDate |
2009 |
| dc.date.none.fl_str_mv |
2009 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
| format |
article |
| status_str |
publishedVersion |
| dc.identifier.none.fl_str_mv |
http://sedici.unlp.edu.ar/handle/10915/162896 |
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http://sedici.unlp.edu.ar/handle/10915/162896 |
| dc.language.none.fl_str_mv |
eng |
| language |
eng |
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info:eu-repo/semantics/altIdentifier/issn/1932-7447 info:eu-repo/semantics/altIdentifier/issn/1932-7455 info:eu-repo/semantics/altIdentifier/doi/10.1021/jp905560d |
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info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) |
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openAccess |
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http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) |
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application/pdf 17097-17103 |
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