Niobium: a promising Pd co-electrocatalyst for ethanol electrooxidation reactions
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1007/s10008-017-3802-1 http://hdl.handle.net/11449/175361 |
Resumo: | This work reports the sol–gel synthesis and characterization of PdxNby/C binary electrocatalysts applied to ethanol electrooxidation reactions (EORs). Catalysts were prepared using different Pd/Nb mass ratios (1:0; 1:1; 1:3; 3:1; 0:1) and were supported on Vulcan XC-72 carbon (20 wt%). The materials were characterized by transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, inductively coupled plasma mass spectrometry, and X-ray photoelectron spectroscopy. The EOR catalytic activity was studied by cyclic voltammetry (CV) and chronoamperometry (CA). The results showed that the EOR current density peak using Pd1Nb1/C (45.5 mA mg−1) was 2.86 times higher than that of commercial Pd/C (15.9 mA mg−1). This catalyst also showed a less positive EOR onset potential and 2.35 times higher current density than Pd/C did in CA. The Pd1Nb1/C (− 0.54 V) showed onset potential more negative than Pd/C (− 0.50 V) for CO-stripping analysis. Additionally, the addition of Nb in the Pd/C reduces COads poisoning of the electrocatalyst. The results suggest that Nb decreases the poisoning effect of CO on the Pd surface due to the bifunctional mechanism in which Nb supplies oxygenated species for CO oxidation at poisoned Pd active sites. No evidence of Pd/Nb alloy formation has been found. The maximization of the bifunctional effect occurs in Pd1Nb1/C. |
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Niobium: a promising Pd co-electrocatalyst for ethanol electrooxidation reactionsAlkaline direct ethanol fuel cellsEthanol electrooxidation reactionNiobium nanoparticlesPalladium nanoparticlesThis work reports the sol–gel synthesis and characterization of PdxNby/C binary electrocatalysts applied to ethanol electrooxidation reactions (EORs). Catalysts were prepared using different Pd/Nb mass ratios (1:0; 1:1; 1:3; 3:1; 0:1) and were supported on Vulcan XC-72 carbon (20 wt%). The materials were characterized by transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, inductively coupled plasma mass spectrometry, and X-ray photoelectron spectroscopy. The EOR catalytic activity was studied by cyclic voltammetry (CV) and chronoamperometry (CA). The results showed that the EOR current density peak using Pd1Nb1/C (45.5 mA mg−1) was 2.86 times higher than that of commercial Pd/C (15.9 mA mg−1). This catalyst also showed a less positive EOR onset potential and 2.35 times higher current density than Pd/C did in CA. The Pd1Nb1/C (− 0.54 V) showed onset potential more negative than Pd/C (− 0.50 V) for CO-stripping analysis. Additionally, the addition of Nb in the Pd/C reduces COads poisoning of the electrocatalyst. The results suggest that Nb decreases the poisoning effect of CO on the Pd surface due to the bifunctional mechanism in which Nb supplies oxygenated species for CO oxidation at poisoned Pd active sites. No evidence of Pd/Nb alloy formation has been found. The maximization of the bifunctional effect occurs in Pd1Nb1/C.LEMN—Centro de Ciências Naturais e Humanas (CCNH) Universidade Federal do ABC (UFABC), CEP 09.210-170, Rua Santa Adélia 166, Bairro BanguInstituto de Química Universidade de São Paulo, Av. Prof. Lineu Prestes, 748Instituto de Química de Araraquara Departamento de Físico-Química Universidade Estadual Paulista (UNESP)Instituto de Química de Araraquara Departamento de Físico-Química Universidade Estadual Paulista (UNESP)Universidade Federal do ABC (UFABC)Universidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Moura Souza, F.Parreira, L. S.Hammer, P. [UNESP]Batista, B. L.Santos, M. C.2018-12-11T17:15:28Z2018-12-11T17:15:28Z2018-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1495-1506application/pdfhttp://dx.doi.org/10.1007/s10008-017-3802-1Journal of Solid State Electrochemistry, v. 22, n. 5, p. 1495-1506, 2018.1432-8488http://hdl.handle.net/11449/17536110.1007/s10008-017-3802-12-s2.0-850317520942-s2.0-85031752094.pdf64668410235061310000-0002-3823-0050Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Solid State Electrochemistry0,661info:eu-repo/semantics/openAccess2023-10-14T06:09:38Zoai:repositorio.unesp.br:11449/175361Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-10-14T06:09:38Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Niobium: a promising Pd co-electrocatalyst for ethanol electrooxidation reactions |
title |
Niobium: a promising Pd co-electrocatalyst for ethanol electrooxidation reactions |
spellingShingle |
Niobium: a promising Pd co-electrocatalyst for ethanol electrooxidation reactions Moura Souza, F. Alkaline direct ethanol fuel cells Ethanol electrooxidation reaction Niobium nanoparticles Palladium nanoparticles |
title_short |
Niobium: a promising Pd co-electrocatalyst for ethanol electrooxidation reactions |
title_full |
Niobium: a promising Pd co-electrocatalyst for ethanol electrooxidation reactions |
title_fullStr |
Niobium: a promising Pd co-electrocatalyst for ethanol electrooxidation reactions |
title_full_unstemmed |
Niobium: a promising Pd co-electrocatalyst for ethanol electrooxidation reactions |
title_sort |
Niobium: a promising Pd co-electrocatalyst for ethanol electrooxidation reactions |
author |
Moura Souza, F. |
author_facet |
Moura Souza, F. Parreira, L. S. Hammer, P. [UNESP] Batista, B. L. Santos, M. C. |
author_role |
author |
author2 |
Parreira, L. S. Hammer, P. [UNESP] Batista, B. L. Santos, M. C. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Federal do ABC (UFABC) Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Moura Souza, F. Parreira, L. S. Hammer, P. [UNESP] Batista, B. L. Santos, M. C. |
dc.subject.por.fl_str_mv |
Alkaline direct ethanol fuel cells Ethanol electrooxidation reaction Niobium nanoparticles Palladium nanoparticles |
topic |
Alkaline direct ethanol fuel cells Ethanol electrooxidation reaction Niobium nanoparticles Palladium nanoparticles |
description |
This work reports the sol–gel synthesis and characterization of PdxNby/C binary electrocatalysts applied to ethanol electrooxidation reactions (EORs). Catalysts were prepared using different Pd/Nb mass ratios (1:0; 1:1; 1:3; 3:1; 0:1) and were supported on Vulcan XC-72 carbon (20 wt%). The materials were characterized by transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, inductively coupled plasma mass spectrometry, and X-ray photoelectron spectroscopy. The EOR catalytic activity was studied by cyclic voltammetry (CV) and chronoamperometry (CA). The results showed that the EOR current density peak using Pd1Nb1/C (45.5 mA mg−1) was 2.86 times higher than that of commercial Pd/C (15.9 mA mg−1). This catalyst also showed a less positive EOR onset potential and 2.35 times higher current density than Pd/C did in CA. The Pd1Nb1/C (− 0.54 V) showed onset potential more negative than Pd/C (− 0.50 V) for CO-stripping analysis. Additionally, the addition of Nb in the Pd/C reduces COads poisoning of the electrocatalyst. The results suggest that Nb decreases the poisoning effect of CO on the Pd surface due to the bifunctional mechanism in which Nb supplies oxygenated species for CO oxidation at poisoned Pd active sites. No evidence of Pd/Nb alloy formation has been found. The maximization of the bifunctional effect occurs in Pd1Nb1/C. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-12-11T17:15:28Z 2018-12-11T17:15:28Z 2018-05-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1007/s10008-017-3802-1 Journal of Solid State Electrochemistry, v. 22, n. 5, p. 1495-1506, 2018. 1432-8488 http://hdl.handle.net/11449/175361 10.1007/s10008-017-3802-1 2-s2.0-85031752094 2-s2.0-85031752094.pdf 6466841023506131 0000-0002-3823-0050 |
url |
http://dx.doi.org/10.1007/s10008-017-3802-1 http://hdl.handle.net/11449/175361 |
identifier_str_mv |
Journal of Solid State Electrochemistry, v. 22, n. 5, p. 1495-1506, 2018. 1432-8488 10.1007/s10008-017-3802-1 2-s2.0-85031752094 2-s2.0-85031752094.pdf 6466841023506131 0000-0002-3823-0050 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Solid State Electrochemistry 0,661 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
1495-1506 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
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1797789395872382976 |