Cu and Pd nanoparticles supported on a graphitic carbon material as bifunctional HER/ORR electrocatalysts

The development of efficient, available and robust substitutes for the Pt-based electrocatalysts is very important for a sustainable energetic future. Herein, we report a series of composites based on Cu, Pd and Cu-Pd nanoparticles (NPs) supported on high surface area graphite (HSAG), as electrocata...

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Detalles Bibliográficos
Autores: Nunes, Marta S., Fernandes, Diana M., Morales, M. V., Rodríguez Ramos, Inmaculada, Freire, Cristina, Guerrero Ruiz, Antonio R
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universidad Nacional de Educación a Distancia
Repositorio:e-spacio. Repositorio Institucional de la UNED
Idioma:inglés
OAI Identifier:oai:e-spacio.uned.es:20.500.14468/24279
Acceso en línea:https://hdl.handle.net/20.500.14468/24279
Access Level:acceso abierto
Palabra clave:23 Química::2303 Química inorgánica
Oxygen reduction reaction
Hydrogen evolution reaction
Palladium nanoparticles
Copper nanoparticles
Bifunctionality
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spelling Cu and Pd nanoparticles supported on a graphitic carbon material as bifunctional HER/ORR electrocatalystsNunes, Marta S.Fernandes, Diana M.Morales, M. V.Rodríguez Ramos, InmaculadaFreire, CristinaGuerrero Ruiz, Antonio R23 Química::2303 Química inorgánicaOxygen reduction reactionHydrogen evolution reactionPalladium nanoparticlesCopper nanoparticlesBifunctionalityThe development of efficient, available and robust substitutes for the Pt-based electrocatalysts is very important for a sustainable energetic future. Herein, we report a series of composites based on Cu, Pd and Cu-Pd nanoparticles (NPs) supported on high surface area graphite (HSAG), as electrocatalysts for the energy-related reduction reactions – oxygen reduction (ORR) and hydrogen evolution (HER) reactions. All the composites showed interesting ORR electrocatalytic activities in alkaline medium. The Pd/HSAG and Cu-Pd/HSAG composites exhibited the most promising performances, with onset potentials of 0.84 and 0.91 V and current densities of jL, 0.3 V, 1600 rpm=−3.5 and −4.2 mA cm−2, respectively. All the composites showed selectivity for the 4-electron process and Tafel slopes in the range 48–77 mV dec−1. The metal/HSAG composites revealed a great tolerance to methanol and moderate electrochemical stability. In highly acidic medium (0.5 mol dm−3 H2SO4, pH=0.3) only the Cu-Pd/HSAG and Pd/HSAG electrocatalysts presented electrocatalytic activity toward HER, with relative low overpotentials (η10=0.145 and 0.063 V, respectively), small Tafel slopes (75 and 42 mV dec−1) and similar exchange current densities (0.43 and 0.57 mA cm−2). These electrocatalysts also showed moderate electrochemical stability, in particular Cu-Pd/ HSAG for which overpotential only changed between 0.033 and 0.038 V for j=40mAcm−2. The results showed that only small loading of Pd NPs (1 wt.% Pd) was able to improve significantly the ORR/ HER electrocatalytic activity, which is a very important outcome to rationalize the design of efficient and costeffective electrocatalysts in future.ELSEVIERhttps://orcid.org/0000-0002-0460-451Xhttps://orcid.org/0000-0001-5263-2737https://orcid.org/0000-0003-2834-0296https://orcid.org/0000-0003-4622-6008https://orcid.org/0000-0003-1848-5985e-Spacio UNED20242024-11-0720202020-11-0120202020-11-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14468/24279reponame:e-spacio. Repositorio Institucional de la UNEDinstname:Universidad Nacional de Educación a DistanciaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.esoai:e-spacio.uned.es:20.500.14468/242792026-06-06T12:38:31Z
dc.title.none.fl_str_mv Cu and Pd nanoparticles supported on a graphitic carbon material as bifunctional HER/ORR electrocatalysts
title Cu and Pd nanoparticles supported on a graphitic carbon material as bifunctional HER/ORR electrocatalysts
spellingShingle Cu and Pd nanoparticles supported on a graphitic carbon material as bifunctional HER/ORR electrocatalysts
Nunes, Marta S.
23 Química::2303 Química inorgánica
Oxygen reduction reaction
Hydrogen evolution reaction
Palladium nanoparticles
Copper nanoparticles
Bifunctionality
title_short Cu and Pd nanoparticles supported on a graphitic carbon material as bifunctional HER/ORR electrocatalysts
title_full Cu and Pd nanoparticles supported on a graphitic carbon material as bifunctional HER/ORR electrocatalysts
title_fullStr Cu and Pd nanoparticles supported on a graphitic carbon material as bifunctional HER/ORR electrocatalysts
title_full_unstemmed Cu and Pd nanoparticles supported on a graphitic carbon material as bifunctional HER/ORR electrocatalysts
title_sort Cu and Pd nanoparticles supported on a graphitic carbon material as bifunctional HER/ORR electrocatalysts
dc.creator.none.fl_str_mv Nunes, Marta S.
Fernandes, Diana M.
Morales, M. V.
Rodríguez Ramos, Inmaculada
Freire, Cristina
Guerrero Ruiz, Antonio R
author Nunes, Marta S.
author_facet Nunes, Marta S.
Fernandes, Diana M.
Morales, M. V.
Rodríguez Ramos, Inmaculada
Freire, Cristina
Guerrero Ruiz, Antonio R
author_role author
author2 Fernandes, Diana M.
Morales, M. V.
Rodríguez Ramos, Inmaculada
Freire, Cristina
Guerrero Ruiz, Antonio R
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv https://orcid.org/0000-0002-0460-451X
https://orcid.org/0000-0001-5263-2737
https://orcid.org/0000-0003-2834-0296
https://orcid.org/0000-0003-4622-6008
https://orcid.org/0000-0003-1848-5985
e-Spacio UNED
dc.subject.none.fl_str_mv 23 Química::2303 Química inorgánica
Oxygen reduction reaction
Hydrogen evolution reaction
Palladium nanoparticles
Copper nanoparticles
Bifunctionality
topic 23 Química::2303 Química inorgánica
Oxygen reduction reaction
Hydrogen evolution reaction
Palladium nanoparticles
Copper nanoparticles
Bifunctionality
description The development of efficient, available and robust substitutes for the Pt-based electrocatalysts is very important for a sustainable energetic future. Herein, we report a series of composites based on Cu, Pd and Cu-Pd nanoparticles (NPs) supported on high surface area graphite (HSAG), as electrocatalysts for the energy-related reduction reactions – oxygen reduction (ORR) and hydrogen evolution (HER) reactions. All the composites showed interesting ORR electrocatalytic activities in alkaline medium. The Pd/HSAG and Cu-Pd/HSAG composites exhibited the most promising performances, with onset potentials of 0.84 and 0.91 V and current densities of jL, 0.3 V, 1600 rpm=−3.5 and −4.2 mA cm−2, respectively. All the composites showed selectivity for the 4-electron process and Tafel slopes in the range 48–77 mV dec−1. The metal/HSAG composites revealed a great tolerance to methanol and moderate electrochemical stability. In highly acidic medium (0.5 mol dm−3 H2SO4, pH=0.3) only the Cu-Pd/HSAG and Pd/HSAG electrocatalysts presented electrocatalytic activity toward HER, with relative low overpotentials (η10=0.145 and 0.063 V, respectively), small Tafel slopes (75 and 42 mV dec−1) and similar exchange current densities (0.43 and 0.57 mA cm−2). These electrocatalysts also showed moderate electrochemical stability, in particular Cu-Pd/ HSAG for which overpotential only changed between 0.033 and 0.038 V for j=40mAcm−2. The results showed that only small loading of Pd NPs (1 wt.% Pd) was able to improve significantly the ORR/ HER electrocatalytic activity, which is a very important outcome to rationalize the design of efficient and costeffective electrocatalysts in future.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020-11-01
2020
2020-11-01
2024
2024-11-07
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14468/24279
url https://hdl.handle.net/20.500.14468/24279
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
http://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv ELSEVIER
publisher.none.fl_str_mv ELSEVIER
dc.source.none.fl_str_mv reponame:e-spacio. Repositorio Institucional de la UNED
instname:Universidad Nacional de Educación a Distancia
instname_str Universidad Nacional de Educación a Distancia
reponame_str e-spacio. Repositorio Institucional de la UNED
collection e-spacio. Repositorio Institucional de la UNED
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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