Towards efficient oxygen reduction reaction electrocatalysts through graphene doping

Detalhes bibliográficos
Autor(a) principal: Fernandes, Diana M.
Data de Publicação: 2019
Outros Autores: Mathumba, Penny, Fernandes, António J.S., Iwuoha, Emmanuel I., Freire, Cristina
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/37575
Resumo: The incessant and drastic growth of global energy demand make it imperative to develop new affordable high-quality materials at a large scale to act as powerful electrocatalysts (ECs) on the relevant energy reactions. Here, we report the synthesis and characterization (FTIR, Raman, XPS, XRD, TEM and SEM) of new engineered electrocatalysts based on situ co-precipitation of Co3O4 or Mn3O4 nanoparticles in the presence of N, S-doped graphene (Co/N3S3-GF and Mn/N3S3-GF). The nitrogen, sulphur dual-doped graphene was achieved by a scalable dry ball-milling procedure followed by thermal treatment using graphene flakes as carbon source and trithiocyanuric acid as the precursor. The three materials prepared were applied as electrocatalysts for the oxygen reduction reaction (ORR) and demonstrated excellent electrocatalytic performance in alkaline medium with Co/N3S3-GF and Mn/N3S3-GF presenting onset potentials of 0.87 V vs. RHE. These were comparable to Pt/C onset potential (0.91 V). All materials showed good diffusion-limiting current densities (−3.49 to −4.17 mA cm−2) and selectivity for the 4-electron O2 reduction to H2O. Furthermore, the Co/N3S3-GF and Mn/N3S3-GF electrocatalysts presented good tolerance to methanol poisoning and good stability with current retentions (76–81%). The approach followed in this work showed that affordable, simple and scalable procedures can be applied to develop ORR electrocatalysts with enhanced performances.
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spelling Towards efficient oxygen reduction reaction electrocatalysts through graphene dopingOxygen reduction reactionGraphene flakesNS-DopingMetal oxidesFuel cellsThe incessant and drastic growth of global energy demand make it imperative to develop new affordable high-quality materials at a large scale to act as powerful electrocatalysts (ECs) on the relevant energy reactions. Here, we report the synthesis and characterization (FTIR, Raman, XPS, XRD, TEM and SEM) of new engineered electrocatalysts based on situ co-precipitation of Co3O4 or Mn3O4 nanoparticles in the presence of N, S-doped graphene (Co/N3S3-GF and Mn/N3S3-GF). The nitrogen, sulphur dual-doped graphene was achieved by a scalable dry ball-milling procedure followed by thermal treatment using graphene flakes as carbon source and trithiocyanuric acid as the precursor. The three materials prepared were applied as electrocatalysts for the oxygen reduction reaction (ORR) and demonstrated excellent electrocatalytic performance in alkaline medium with Co/N3S3-GF and Mn/N3S3-GF presenting onset potentials of 0.87 V vs. RHE. These were comparable to Pt/C onset potential (0.91 V). All materials showed good diffusion-limiting current densities (−3.49 to −4.17 mA cm−2) and selectivity for the 4-electron O2 reduction to H2O. Furthermore, the Co/N3S3-GF and Mn/N3S3-GF electrocatalysts presented good tolerance to methanol poisoning and good stability with current retentions (76–81%). The approach followed in this work showed that affordable, simple and scalable procedures can be applied to develop ORR electrocatalysts with enhanced performances.Elsevier2023-05-08T10:31:24Z2019-10-01T00:00:00Z2019-10-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/37575eng0013-468610.1016/j.electacta.2019.06.175Fernandes, Diana M.Mathumba, PennyFernandes, António J.S.Iwuoha, Emmanuel I.Freire, Cristinainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T12:12:42Zoai:ria.ua.pt:10773/37575Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:08:11.756054Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Towards efficient oxygen reduction reaction electrocatalysts through graphene doping
title Towards efficient oxygen reduction reaction electrocatalysts through graphene doping
spellingShingle Towards efficient oxygen reduction reaction electrocatalysts through graphene doping
Fernandes, Diana M.
Oxygen reduction reaction
Graphene flakes
N
S-Doping
Metal oxides
Fuel cells
title_short Towards efficient oxygen reduction reaction electrocatalysts through graphene doping
title_full Towards efficient oxygen reduction reaction electrocatalysts through graphene doping
title_fullStr Towards efficient oxygen reduction reaction electrocatalysts through graphene doping
title_full_unstemmed Towards efficient oxygen reduction reaction electrocatalysts through graphene doping
title_sort Towards efficient oxygen reduction reaction electrocatalysts through graphene doping
author Fernandes, Diana M.
author_facet Fernandes, Diana M.
Mathumba, Penny
Fernandes, António J.S.
Iwuoha, Emmanuel I.
Freire, Cristina
author_role author
author2 Mathumba, Penny
Fernandes, António J.S.
Iwuoha, Emmanuel I.
Freire, Cristina
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Fernandes, Diana M.
Mathumba, Penny
Fernandes, António J.S.
Iwuoha, Emmanuel I.
Freire, Cristina
dc.subject.por.fl_str_mv Oxygen reduction reaction
Graphene flakes
N
S-Doping
Metal oxides
Fuel cells
topic Oxygen reduction reaction
Graphene flakes
N
S-Doping
Metal oxides
Fuel cells
description The incessant and drastic growth of global energy demand make it imperative to develop new affordable high-quality materials at a large scale to act as powerful electrocatalysts (ECs) on the relevant energy reactions. Here, we report the synthesis and characterization (FTIR, Raman, XPS, XRD, TEM and SEM) of new engineered electrocatalysts based on situ co-precipitation of Co3O4 or Mn3O4 nanoparticles in the presence of N, S-doped graphene (Co/N3S3-GF and Mn/N3S3-GF). The nitrogen, sulphur dual-doped graphene was achieved by a scalable dry ball-milling procedure followed by thermal treatment using graphene flakes as carbon source and trithiocyanuric acid as the precursor. The three materials prepared were applied as electrocatalysts for the oxygen reduction reaction (ORR) and demonstrated excellent electrocatalytic performance in alkaline medium with Co/N3S3-GF and Mn/N3S3-GF presenting onset potentials of 0.87 V vs. RHE. These were comparable to Pt/C onset potential (0.91 V). All materials showed good diffusion-limiting current densities (−3.49 to −4.17 mA cm−2) and selectivity for the 4-electron O2 reduction to H2O. Furthermore, the Co/N3S3-GF and Mn/N3S3-GF electrocatalysts presented good tolerance to methanol poisoning and good stability with current retentions (76–81%). The approach followed in this work showed that affordable, simple and scalable procedures can be applied to develop ORR electrocatalysts with enhanced performances.
publishDate 2019
dc.date.none.fl_str_mv 2019-10-01T00:00:00Z
2019-10-01
2023-05-08T10:31:24Z
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://hdl.handle.net/10773/37575
url http://hdl.handle.net/10773/37575
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0013-4686
10.1016/j.electacta.2019.06.175
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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