Charge transfer effects on the chemical reactivity of PdxCu1−x nanoalloys
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/131292 |
Resumo: | This work reports on the synthesis and characterization of PdxCu1−x (x = 0.7, 0.5 and 0.3) nanoalloys obtained via an eco-friendly chemical reduction method based on ascorbic acid and trisodium citrate. The average size of the quasi-spherical nanoparticles (NPs) obtained by this method was about 4 nm, as observed by TEM. The colloids containing different NPs were then supported on carbon in order to produce powder samples (PdxCu1−x/C) whose electronic and structural properties were probed by different techniques. XRD analysis indicated the formation of crystalline PdCu alloys with a nanoscaled crystallite size. Core-level XPS results provided a fingerprint of a charge transfer process between Pd and Cu and its dependency on the nanoalloy composition. Additionally, it was verified that alloying was able to change the NP’s reactivity towards oxidation and reduction. Indeed, the higher the amount of Pd in the nanoalloy, less oxidized are both the Pd and the Cu atoms in the as-prepared samples. Also, in situ XANES experiments during thermal treatment under a reducing atmosphere showed that the temperature required for a complete reduction of the nanoalloys depends on their composition. These results envisage the control at the atomic level of novel catalytic properties of such nanoalloys. |
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Castegnaro, Marcus VinicíusGorgeski, AndreiaBalke, BenjaminAlves, Maria do Carmo MartinsMorais, Jonder2015-12-23T02:40:40Z20162040-3364http://hdl.handle.net/10183/131292000981654This work reports on the synthesis and characterization of PdxCu1−x (x = 0.7, 0.5 and 0.3) nanoalloys obtained via an eco-friendly chemical reduction method based on ascorbic acid and trisodium citrate. The average size of the quasi-spherical nanoparticles (NPs) obtained by this method was about 4 nm, as observed by TEM. The colloids containing different NPs were then supported on carbon in order to produce powder samples (PdxCu1−x/C) whose electronic and structural properties were probed by different techniques. XRD analysis indicated the formation of crystalline PdCu alloys with a nanoscaled crystallite size. Core-level XPS results provided a fingerprint of a charge transfer process between Pd and Cu and its dependency on the nanoalloy composition. Additionally, it was verified that alloying was able to change the NP’s reactivity towards oxidation and reduction. Indeed, the higher the amount of Pd in the nanoalloy, less oxidized are both the Pd and the Cu atoms in the as-prepared samples. Also, in situ XANES experiments during thermal treatment under a reducing atmosphere showed that the temperature required for a complete reduction of the nanoalloys depends on their composition. These results envisage the control at the atomic level of novel catalytic properties of such nanoalloys.application/pdfengNanoscale. Cambridge. Vol. 8, no. 1 (Jan. 2016), p. 641-647Reatividade quimicaNanopartículasCharge transfer effects on the chemical reactivity of PdxCu1−x nanoalloysEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000981654.pdf000981654.pdfTexto completo (inglês)application/pdf2682543http://www.lume.ufrgs.br/bitstream/10183/131292/1/000981654.pdf52b60ded2bf74b87af03ed21f08eb21fMD51TEXT000981654.pdf.txt000981654.pdf.txtExtracted Texttext/plain32923http://www.lume.ufrgs.br/bitstream/10183/131292/2/000981654.pdf.txteef3cd8076c15df69272f63d35abb5b7MD52THUMBNAIL000981654.pdf.jpg000981654.pdf.jpgGenerated Thumbnailimage/jpeg1930http://www.lume.ufrgs.br/bitstream/10183/131292/3/000981654.pdf.jpge2496455eada2e89d6756c855b875899MD5310183/1312922023-08-11 03:54:51.428269oai:www.lume.ufrgs.br:10183/131292Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-08-11T06:54:51Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Charge transfer effects on the chemical reactivity of PdxCu1−x nanoalloys |
title |
Charge transfer effects on the chemical reactivity of PdxCu1−x nanoalloys |
spellingShingle |
Charge transfer effects on the chemical reactivity of PdxCu1−x nanoalloys Castegnaro, Marcus Vinicíus Reatividade quimica Nanopartículas |
title_short |
Charge transfer effects on the chemical reactivity of PdxCu1−x nanoalloys |
title_full |
Charge transfer effects on the chemical reactivity of PdxCu1−x nanoalloys |
title_fullStr |
Charge transfer effects on the chemical reactivity of PdxCu1−x nanoalloys |
title_full_unstemmed |
Charge transfer effects on the chemical reactivity of PdxCu1−x nanoalloys |
title_sort |
Charge transfer effects on the chemical reactivity of PdxCu1−x nanoalloys |
author |
Castegnaro, Marcus Vinicíus |
author_facet |
Castegnaro, Marcus Vinicíus Gorgeski, Andreia Balke, Benjamin Alves, Maria do Carmo Martins Morais, Jonder |
author_role |
author |
author2 |
Gorgeski, Andreia Balke, Benjamin Alves, Maria do Carmo Martins Morais, Jonder |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Castegnaro, Marcus Vinicíus Gorgeski, Andreia Balke, Benjamin Alves, Maria do Carmo Martins Morais, Jonder |
dc.subject.por.fl_str_mv |
Reatividade quimica Nanopartículas |
topic |
Reatividade quimica Nanopartículas |
description |
This work reports on the synthesis and characterization of PdxCu1−x (x = 0.7, 0.5 and 0.3) nanoalloys obtained via an eco-friendly chemical reduction method based on ascorbic acid and trisodium citrate. The average size of the quasi-spherical nanoparticles (NPs) obtained by this method was about 4 nm, as observed by TEM. The colloids containing different NPs were then supported on carbon in order to produce powder samples (PdxCu1−x/C) whose electronic and structural properties were probed by different techniques. XRD analysis indicated the formation of crystalline PdCu alloys with a nanoscaled crystallite size. Core-level XPS results provided a fingerprint of a charge transfer process between Pd and Cu and its dependency on the nanoalloy composition. Additionally, it was verified that alloying was able to change the NP’s reactivity towards oxidation and reduction. Indeed, the higher the amount of Pd in the nanoalloy, less oxidized are both the Pd and the Cu atoms in the as-prepared samples. Also, in situ XANES experiments during thermal treatment under a reducing atmosphere showed that the temperature required for a complete reduction of the nanoalloys depends on their composition. These results envisage the control at the atomic level of novel catalytic properties of such nanoalloys. |
publishDate |
2015 |
dc.date.accessioned.fl_str_mv |
2015-12-23T02:40:40Z |
dc.date.issued.fl_str_mv |
2016 |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/131292 |
dc.identifier.issn.pt_BR.fl_str_mv |
2040-3364 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000981654 |
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url |
http://hdl.handle.net/10183/131292 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Nanoscale. Cambridge. Vol. 8, no. 1 (Jan. 2016), p. 641-647 |
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info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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Repositório Institucional da UFRGS |
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