Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation
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 UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.apcatb.2015.02.021 http://hdl.handle.net/11449/177317 |
Resumo: | This study reports on the use of PtRh/C electrocatalysts prepared by the borohydride reduction method with different Pt:Rh atomic ratios: (90:10, 70:30 and 50:50) which was investigated toward the ammonia electro-oxidation considering electrochemical and also direct ammonia fuel cell (DAFC) experiments. The DAFC experiments were conducted using different proportions of NH4OH and KOH as fuels. X-ray diffraction showed the formation of PtRh alloy while transmission electron micrographs showed the particles sizes between 4.1 and 4.5nm. Among the different NH4OH and KOH concentrations the combination of 3molL-1 NH4OH and 3molL-1 KOH was the most favorable due to the higher KOH concentration, which increased the electrolyte conductivity, thus, improving the ammonia oxidation. Moreover, among the PtRh/C electrocatalysts the Pt:Rh ratio of 90:10 showed to be the best suited one since it showed a power density almost 60% higher than Pt. X-ray photoelectron spectroscopy results revealed for this catalyst that the nanoparticles contain a high proportion of metallic Pt and Rh phases, supporting the alloy formation between Pt and Rh. The improved fuel cell efficiency can be related to the combination of different effects: the alloy formation between Pt and Rh (electronic effect), suppressing the adsorption strength of poisonous intermediates, and a synergic effect between Pt and Rh at this composition. |
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Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluationBorohydride reduction methodsDirect ammonia fuel cellPtRh/C catalystsThis study reports on the use of PtRh/C electrocatalysts prepared by the borohydride reduction method with different Pt:Rh atomic ratios: (90:10, 70:30 and 50:50) which was investigated toward the ammonia electro-oxidation considering electrochemical and also direct ammonia fuel cell (DAFC) experiments. The DAFC experiments were conducted using different proportions of NH4OH and KOH as fuels. X-ray diffraction showed the formation of PtRh alloy while transmission electron micrographs showed the particles sizes between 4.1 and 4.5nm. Among the different NH4OH and KOH concentrations the combination of 3molL-1 NH4OH and 3molL-1 KOH was the most favorable due to the higher KOH concentration, which increased the electrolyte conductivity, thus, improving the ammonia oxidation. Moreover, among the PtRh/C electrocatalysts the Pt:Rh ratio of 90:10 showed to be the best suited one since it showed a power density almost 60% higher than Pt. X-ray photoelectron spectroscopy results revealed for this catalyst that the nanoparticles contain a high proportion of metallic Pt and Rh phases, supporting the alloy formation between Pt and Rh. The improved fuel cell efficiency can be related to the combination of different effects: the alloy formation between Pt and Rh (electronic effect), suppressing the adsorption strength of poisonous intermediates, and a synergic effect between Pt and Rh at this composition.Instituto de Pesquisas Energéticas e Nucleares, IPEN/CNEN-SP, Av. Prof. Lineu Prestes, 2242 Cidade UniversitáriaInstituto de Química, UNESP - Universidade do Estado de São PauloLaboratório de Eletroquímica e Materiais Nanoestruturados, Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Rua Santa Adélia, 166Instituto de Química, UNESP - Universidade do Estado de São PauloInstituto de Pesquisas Energéticas e Nucleares, IPEN/CNEN-SPUniversidade Estadual Paulista (Unesp)Universidade Federal do ABC (UFABC)Assumpção, MÔnica H.M.T.Piasentin, Ricardo M.Hammer, Peter [UNESP]De Souza, Rodrigo F.B.Buzzo, Guilherme S.Santos, Mauro C.Spinacé, Estevam V.Neto, Almir O.Silva, Júlio César M.2018-12-11T17:24:55Z2018-12-11T17:24:55Z2015-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article136-144application/pdfhttp://dx.doi.org/10.1016/j.apcatb.2015.02.021Applied Catalysis B: Environmental, v. 174-175, p. 136-144.0926-3373http://hdl.handle.net/11449/17731710.1016/j.apcatb.2015.02.0212-s2.0-849247778032-s2.0-84924777803.pdf64668410235061310000-0002-3823-0050Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengApplied Catalysis B: Environmental3,152info:eu-repo/semantics/openAccess2023-12-15T06:20:51Zoai:repositorio.unesp.br:11449/177317Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-12-15T06:20:51Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation |
title |
Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation |
spellingShingle |
Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation Assumpção, MÔnica H.M.T. Borohydride reduction methods Direct ammonia fuel cell PtRh/C catalysts |
title_short |
Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation |
title_full |
Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation |
title_fullStr |
Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation |
title_full_unstemmed |
Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation |
title_sort |
Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation |
author |
Assumpção, MÔnica H.M.T. |
author_facet |
Assumpção, MÔnica H.M.T. Piasentin, Ricardo M. Hammer, Peter [UNESP] De Souza, Rodrigo F.B. Buzzo, Guilherme S. Santos, Mauro C. Spinacé, Estevam V. Neto, Almir O. Silva, Júlio César M. |
author_role |
author |
author2 |
Piasentin, Ricardo M. Hammer, Peter [UNESP] De Souza, Rodrigo F.B. Buzzo, Guilherme S. Santos, Mauro C. Spinacé, Estevam V. Neto, Almir O. Silva, Júlio César M. |
author2_role |
author author author author author author author author |
dc.contributor.none.fl_str_mv |
Instituto de Pesquisas Energéticas e Nucleares, IPEN/CNEN-SP Universidade Estadual Paulista (Unesp) Universidade Federal do ABC (UFABC) |
dc.contributor.author.fl_str_mv |
Assumpção, MÔnica H.M.T. Piasentin, Ricardo M. Hammer, Peter [UNESP] De Souza, Rodrigo F.B. Buzzo, Guilherme S. Santos, Mauro C. Spinacé, Estevam V. Neto, Almir O. Silva, Júlio César M. |
dc.subject.por.fl_str_mv |
Borohydride reduction methods Direct ammonia fuel cell PtRh/C catalysts |
topic |
Borohydride reduction methods Direct ammonia fuel cell PtRh/C catalysts |
description |
This study reports on the use of PtRh/C electrocatalysts prepared by the borohydride reduction method with different Pt:Rh atomic ratios: (90:10, 70:30 and 50:50) which was investigated toward the ammonia electro-oxidation considering electrochemical and also direct ammonia fuel cell (DAFC) experiments. The DAFC experiments were conducted using different proportions of NH4OH and KOH as fuels. X-ray diffraction showed the formation of PtRh alloy while transmission electron micrographs showed the particles sizes between 4.1 and 4.5nm. Among the different NH4OH and KOH concentrations the combination of 3molL-1 NH4OH and 3molL-1 KOH was the most favorable due to the higher KOH concentration, which increased the electrolyte conductivity, thus, improving the ammonia oxidation. Moreover, among the PtRh/C electrocatalysts the Pt:Rh ratio of 90:10 showed to be the best suited one since it showed a power density almost 60% higher than Pt. X-ray photoelectron spectroscopy results revealed for this catalyst that the nanoparticles contain a high proportion of metallic Pt and Rh phases, supporting the alloy formation between Pt and Rh. The improved fuel cell efficiency can be related to the combination of different effects: the alloy formation between Pt and Rh (electronic effect), suppressing the adsorption strength of poisonous intermediates, and a synergic effect between Pt and Rh at this composition. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-09-01 2018-12-11T17:24:55Z 2018-12-11T17:24:55Z |
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/10.1016/j.apcatb.2015.02.021 Applied Catalysis B: Environmental, v. 174-175, p. 136-144. 0926-3373 http://hdl.handle.net/11449/177317 10.1016/j.apcatb.2015.02.021 2-s2.0-84924777803 2-s2.0-84924777803.pdf 6466841023506131 0000-0002-3823-0050 |
url |
http://dx.doi.org/10.1016/j.apcatb.2015.02.021 http://hdl.handle.net/11449/177317 |
identifier_str_mv |
Applied Catalysis B: Environmental, v. 174-175, p. 136-144. 0926-3373 10.1016/j.apcatb.2015.02.021 2-s2.0-84924777803 2-s2.0-84924777803.pdf 6466841023506131 0000-0002-3823-0050 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Applied Catalysis B: Environmental 3,152 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
136-144 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 |
|
_version_ |
1792962089371828224 |