‘‘Naked’’ gold nanoparticles supported on HOPG: melanin functionalization and catalytic activity

Reductive electrodesorption has been used to produce ‘‘naked’’ gold nanoparticles (AuNPs) 3 nm in size on HOPG from different thiolate-capped AuNPs. The clean AuNPs transform the electrocatalytic inert HOPG into an active surface for hydrogen peroxide electroreduction, causing a lowering of the cath...

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Autores principales: González Orive, A., Grumelli, Doris Elda, Vericat, Carolina, Ramallo López, José Martín, Giovanetti, Lisandro José, Benitez, Guillermo Alfredo, Azcárate, Julio César, Corthey, Gastón, Fonticelli, Mariano Hernán, Requejo, Félix Gregorio, Hernández Creus, A., Salvarezza, Roberto Carlos
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Química
Nanopartículas
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/102779
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-102779
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Nanopartículas
spellingShingle Química
Nanopartículas
González Orive, A.
Grumelli, Doris Elda
Vericat, Carolina
Ramallo López, José Martín
Giovanetti, Lisandro José
Benitez, Guillermo Alfredo
Azcárate, Julio César
Corthey, Gastón
Fonticelli, Mariano Hernán
Requejo, Félix Gregorio
Hernández Creus, A.
Salvarezza, Roberto Carlos
‘‘Naked’’ gold nanoparticles supported on HOPG: melanin functionalization and catalytic activity
topic_facet Química
Nanopartículas
description Reductive electrodesorption has been used to produce ‘‘naked’’ gold nanoparticles (AuNPs) 3 nm in size on HOPG from different thiolate-capped AuNPs. The clean AuNPs transform the electrocatalytic inert HOPG into an active surface for hydrogen peroxide electroreduction, causing a lowering of the cathodic overpotential of 0.25 V with respect to the Au(111) surface. Compared to the plain gold substrates, the nanostructures promote only a slight increase in the hydrogen evolution reaction. In a second modification step a 1 nm thick melanin–iron coating is electrochemically formed around the AuNPs. This ultrathin melanin–iron coating largely improves the catalytic activity of the bare AuNPs for both hydrogen peroxide electroreduction and hydrogen evolution reaction. This strategy, which integrates electrochemistry and nanotechnology, can be applied to the preparation of efficient ‘‘naked’’ AuNPs and organic-iron capped AuNPs catalysts.
format Articulo
Articulo
author González Orive, A.
Grumelli, Doris Elda
Vericat, Carolina
Ramallo López, José Martín
Giovanetti, Lisandro José
Benitez, Guillermo Alfredo
Azcárate, Julio César
Corthey, Gastón
Fonticelli, Mariano Hernán
Requejo, Félix Gregorio
Hernández Creus, A.
Salvarezza, Roberto Carlos
author_facet González Orive, A.
Grumelli, Doris Elda
Vericat, Carolina
Ramallo López, José Martín
Giovanetti, Lisandro José
Benitez, Guillermo Alfredo
Azcárate, Julio César
Corthey, Gastón
Fonticelli, Mariano Hernán
Requejo, Félix Gregorio
Hernández Creus, A.
Salvarezza, Roberto Carlos
author_sort González Orive, A.
title ‘‘Naked’’ gold nanoparticles supported on HOPG: melanin functionalization and catalytic activity
title_short ‘‘Naked’’ gold nanoparticles supported on HOPG: melanin functionalization and catalytic activity
title_full ‘‘Naked’’ gold nanoparticles supported on HOPG: melanin functionalization and catalytic activity
title_fullStr ‘‘Naked’’ gold nanoparticles supported on HOPG: melanin functionalization and catalytic activity
title_full_unstemmed ‘‘Naked’’ gold nanoparticles supported on HOPG: melanin functionalization and catalytic activity
title_sort ‘‘naked’’ gold nanoparticles supported on hopg: melanin functionalization and catalytic activity
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/102779
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