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Synthesis of Au@Pt Core—Shell Nanoparticles as Efficient Electrocatalyst for Methanol Electro-Oxidation

Bimetallic Au@Pt nanoparticles (NPs) with Pt monolayer shell are of much interest for applications in heterogeneous catalysts because of enhanced catalytic activity and very low Pt-utilization. However, precisely controlled synthesis with uniform Pt-monolayers and stability on the AuNPs seeds remain...

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Autores principales: Higareda, América, Kumar-Krishnan, Siva, García-Ruiz, Amado F., Maya-Cornejo, José, Lopez-Miranda, José L., Bahena, Daniel, Rosas, Gerardo, Pérez, Ramiro, Esparza, Rodrigo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6915688/
https://www.ncbi.nlm.nih.gov/pubmed/31752428
http://dx.doi.org/10.3390/nano9111644
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author Higareda, América
Kumar-Krishnan, Siva
García-Ruiz, Amado F.
Maya-Cornejo, José
Lopez-Miranda, José L.
Bahena, Daniel
Rosas, Gerardo
Pérez, Ramiro
Esparza, Rodrigo
author_facet Higareda, América
Kumar-Krishnan, Siva
García-Ruiz, Amado F.
Maya-Cornejo, José
Lopez-Miranda, José L.
Bahena, Daniel
Rosas, Gerardo
Pérez, Ramiro
Esparza, Rodrigo
author_sort Higareda, América
collection PubMed
description Bimetallic Au@Pt nanoparticles (NPs) with Pt monolayer shell are of much interest for applications in heterogeneous catalysts because of enhanced catalytic activity and very low Pt-utilization. However, precisely controlled synthesis with uniform Pt-monolayers and stability on the AuNPs seeds remain elusive. Herein, we report the controlled deposition of Pt-monolayer onto uniform AuNPs seeds to obtain Au@Pt core–shell NPs and their Pt-coverage dependent electrocatalytic activity for methanol electro-oxidation. The atomic ratio between Au/Pt was effectively tuned by varying the precursor solution ratio in the reaction solution. The morphology and atomic structure of the Au@Pt NPs were analyzed by high-resolution scanning transmission electron microcopy (HR-STEM) and X-ray diffraction (XRD) techniques. The results demonstrated that the Au@Pt core–shell NPs with Pt-shell thickness (atomic ratio 1:2) exhibit higher electrocatalytic activity for methanol electro-oxidation reaction, whereas higher and lower Pt ratios showed less overall catalytic performance. Such higher catalytic performance of Au@Pt NPs (1:2) can be attributed to the weakened CO binding on the Pt/monolayers surface. Our present synthesis strategy and optimization of the catalytic activity of Au@Pt core–shell NPs catalysts provide promising approach to rationally design highly active catalysts with less Pt-usage for high performance electrocatalysts for applications in fuel cells.
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spelling pubmed-69156882019-12-24 Synthesis of Au@Pt Core—Shell Nanoparticles as Efficient Electrocatalyst for Methanol Electro-Oxidation Higareda, América Kumar-Krishnan, Siva García-Ruiz, Amado F. Maya-Cornejo, José Lopez-Miranda, José L. Bahena, Daniel Rosas, Gerardo Pérez, Ramiro Esparza, Rodrigo Nanomaterials (Basel) Article Bimetallic Au@Pt nanoparticles (NPs) with Pt monolayer shell are of much interest for applications in heterogeneous catalysts because of enhanced catalytic activity and very low Pt-utilization. However, precisely controlled synthesis with uniform Pt-monolayers and stability on the AuNPs seeds remain elusive. Herein, we report the controlled deposition of Pt-monolayer onto uniform AuNPs seeds to obtain Au@Pt core–shell NPs and their Pt-coverage dependent electrocatalytic activity for methanol electro-oxidation. The atomic ratio between Au/Pt was effectively tuned by varying the precursor solution ratio in the reaction solution. The morphology and atomic structure of the Au@Pt NPs were analyzed by high-resolution scanning transmission electron microcopy (HR-STEM) and X-ray diffraction (XRD) techniques. The results demonstrated that the Au@Pt core–shell NPs with Pt-shell thickness (atomic ratio 1:2) exhibit higher electrocatalytic activity for methanol electro-oxidation reaction, whereas higher and lower Pt ratios showed less overall catalytic performance. Such higher catalytic performance of Au@Pt NPs (1:2) can be attributed to the weakened CO binding on the Pt/monolayers surface. Our present synthesis strategy and optimization of the catalytic activity of Au@Pt core–shell NPs catalysts provide promising approach to rationally design highly active catalysts with less Pt-usage for high performance electrocatalysts for applications in fuel cells. MDPI 2019-11-19 /pmc/articles/PMC6915688/ /pubmed/31752428 http://dx.doi.org/10.3390/nano9111644 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Higareda, América
Kumar-Krishnan, Siva
García-Ruiz, Amado F.
Maya-Cornejo, José
Lopez-Miranda, José L.
Bahena, Daniel
Rosas, Gerardo
Pérez, Ramiro
Esparza, Rodrigo
Synthesis of Au@Pt Core—Shell Nanoparticles as Efficient Electrocatalyst for Methanol Electro-Oxidation
title Synthesis of Au@Pt Core—Shell Nanoparticles as Efficient Electrocatalyst for Methanol Electro-Oxidation
title_full Synthesis of Au@Pt Core—Shell Nanoparticles as Efficient Electrocatalyst for Methanol Electro-Oxidation
title_fullStr Synthesis of Au@Pt Core—Shell Nanoparticles as Efficient Electrocatalyst for Methanol Electro-Oxidation
title_full_unstemmed Synthesis of Au@Pt Core—Shell Nanoparticles as Efficient Electrocatalyst for Methanol Electro-Oxidation
title_short Synthesis of Au@Pt Core—Shell Nanoparticles as Efficient Electrocatalyst for Methanol Electro-Oxidation
title_sort synthesis of au@pt core—shell nanoparticles as efficient electrocatalyst for methanol electro-oxidation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6915688/
https://www.ncbi.nlm.nih.gov/pubmed/31752428
http://dx.doi.org/10.3390/nano9111644
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