Laccase-modified gold nanorods for electrocatalytic reduction of oxygen

The multicopper oxidase Trametes hirsuta laccase (ThLc) served as a bioelectrocatalyst on nanostructured cathodes. Nanostructuring was provided by gold nanorods (AuNRs), which were characterized and covalently attached to electrodes made of low-density graphite. The nanostructured electrode was the...

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Autores: Di Bari, Chiara, Shleev, Sergey, López de Lacey, Antonio, Pita, Marcos
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2016
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/142667
Acceso en línea:http://hdl.handle.net/10261/142667
Access Level:acceso abierto
Palabra clave:Biofuel cells
Biocathode
Laccase
Gold nanorod
Graphite
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spelling Laccase-modified gold nanorods for electrocatalytic reduction of oxygenDi Bari, ChiaraShleev, SergeyLópez de Lacey, AntonioPita, MarcosBiofuel cellsBiocathodeLaccaseGold nanorodGraphiteThe multicopper oxidase Trametes hirsuta laccase (ThLc) served as a bioelectrocatalyst on nanostructured cathodes. Nanostructuring was provided by gold nanorods (AuNRs), which were characterized and covalently attached to electrodes made of low-density graphite. The nanostructured electrode was the scaffold for covalent and oriented attachment of ThLc. The bioelectrocatalytic currents measured for oxygen reductionwere as high as 0.5 mA/cm2 and 0.7 mA/cm2, which were recorded under direct and mediated electron transfer regimes, respectively. The experimental data were fitted to mathematical models showing that when the O2 is bioelectroreduced at high rotation speed of the electrode the heterogeneous electron transfer step is the rateliming stage. The electrochemical measurement hints a wider population of non-optimally wired laccases than previously reported for 5-8 nmsize Au nanoparticle-modified electrode, which could be due to a larger size of the AuNRs when compared to the laccases as well as their different crystal facets. © 2015 Elsevier B.V.This work was funded by the Seventh Framework Programme (BIOENERGY FP7-PEOPLE-2013-607793 project).Peer ReviewedElsevierEuropean CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2017201720162017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/142667reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/FP7/607793http://doi.org/10.1016/j.bioelechem.2015.10.003Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1426672026-05-22T06:33:51Z
dc.title.none.fl_str_mv Laccase-modified gold nanorods for electrocatalytic reduction of oxygen
title Laccase-modified gold nanorods for electrocatalytic reduction of oxygen
spellingShingle Laccase-modified gold nanorods for electrocatalytic reduction of oxygen
Di Bari, Chiara
Biofuel cells
Biocathode
Laccase
Gold nanorod
Graphite
title_short Laccase-modified gold nanorods for electrocatalytic reduction of oxygen
title_full Laccase-modified gold nanorods for electrocatalytic reduction of oxygen
title_fullStr Laccase-modified gold nanorods for electrocatalytic reduction of oxygen
title_full_unstemmed Laccase-modified gold nanorods for electrocatalytic reduction of oxygen
title_sort Laccase-modified gold nanorods for electrocatalytic reduction of oxygen
dc.creator.none.fl_str_mv Di Bari, Chiara
Shleev, Sergey
López de Lacey, Antonio
Pita, Marcos
author Di Bari, Chiara
author_facet Di Bari, Chiara
Shleev, Sergey
López de Lacey, Antonio
Pita, Marcos
author_role author
author2 Shleev, Sergey
López de Lacey, Antonio
Pita, Marcos
author2_role author
author
author
dc.contributor.none.fl_str_mv European Commission
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Biofuel cells
Biocathode
Laccase
Gold nanorod
Graphite
topic Biofuel cells
Biocathode
Laccase
Gold nanorod
Graphite
description The multicopper oxidase Trametes hirsuta laccase (ThLc) served as a bioelectrocatalyst on nanostructured cathodes. Nanostructuring was provided by gold nanorods (AuNRs), which were characterized and covalently attached to electrodes made of low-density graphite. The nanostructured electrode was the scaffold for covalent and oriented attachment of ThLc. The bioelectrocatalytic currents measured for oxygen reductionwere as high as 0.5 mA/cm2 and 0.7 mA/cm2, which were recorded under direct and mediated electron transfer regimes, respectively. The experimental data were fitted to mathematical models showing that when the O2 is bioelectroreduced at high rotation speed of the electrode the heterogeneous electron transfer step is the rateliming stage. The electrochemical measurement hints a wider population of non-optimally wired laccases than previously reported for 5-8 nmsize Au nanoparticle-modified electrode, which could be due to a larger size of the AuNRs when compared to the laccases as well as their different crystal facets. © 2015 Elsevier B.V.
publishDate 2016
dc.date.none.fl_str_mv 2016
2017
2017
2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/142667
url http://hdl.handle.net/10261/142667
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/EC/FP7/607793
http://doi.org/10.1016/j.bioelechem.2015.10.003
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.811543

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