New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.9/3679 |
Resumo: | ABSTRACT: Proton exchange membranes remain a crucial material and a key challenge to fuel cell science and technology. In this work, new Nafion membranes are prepared by a casting method using aryl- or azaheteroaromatic bisphosphonate compounds as dopants. The incorporation of the dopant, considered at 1 wt% loading after previous selection, produces enhanced proton conductivity properties in the new membranes, at different temperature and relative humidity conditions, in comparison with values obtained with commercial Nafion. Water uptake and ionic exchange capacity (IEC) are also assessed due to their associated impact on transport properties, resulting in superior values than Nafion when tested in the same experimental conditions. These improvements by doped membranes prompted the evaluation of their potential application in fuel cells, at different temperatures. The new membranes, in membrane-electrode assemblies (MEAs), show an increased fuel cell maximum power output with temperature until 60 degrees C or 70 degrees C, followed by a decrease above these temperatures, a Nafion-like behaviour when measured in the same conditions. The membrane doped with [1,4-phenylenebis(hydroxymethanetriyl)] tetrakis(phosphonic acid) (BP2) presents better results than Nafion N-115 membrane at all studied temperatures, with a maximum power output performance of similar to 383 mW cm(-2) at 70 degrees C. Open circuit potentials of the fuel cell were always higher than values obtained for Nafion MEAs in all studied conditions, indicating the possibility of advantageous restrain to gas crossover in the new doped membranes. |
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New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performanceFuel cellsProton exchange membranePolymer electrolyte membraneNafionBisphosphonatesABSTRACT: Proton exchange membranes remain a crucial material and a key challenge to fuel cell science and technology. In this work, new Nafion membranes are prepared by a casting method using aryl- or azaheteroaromatic bisphosphonate compounds as dopants. The incorporation of the dopant, considered at 1 wt% loading after previous selection, produces enhanced proton conductivity properties in the new membranes, at different temperature and relative humidity conditions, in comparison with values obtained with commercial Nafion. Water uptake and ionic exchange capacity (IEC) are also assessed due to their associated impact on transport properties, resulting in superior values than Nafion when tested in the same experimental conditions. These improvements by doped membranes prompted the evaluation of their potential application in fuel cells, at different temperatures. The new membranes, in membrane-electrode assemblies (MEAs), show an increased fuel cell maximum power output with temperature until 60 degrees C or 70 degrees C, followed by a decrease above these temperatures, a Nafion-like behaviour when measured in the same conditions. The membrane doped with [1,4-phenylenebis(hydroxymethanetriyl)] tetrakis(phosphonic acid) (BP2) presents better results than Nafion N-115 membrane at all studied temperatures, with a maximum power output performance of similar to 383 mW cm(-2) at 70 degrees C. Open circuit potentials of the fuel cell were always higher than values obtained for Nafion MEAs in all studied conditions, indicating the possibility of advantageous restrain to gas crossover in the new doped membranes.ElsevierRepositório do LNEGTeixeira, Fatimade Sá, A.I.Teixeira, António P. S.Ortiz-Martínez, V. M.Ortiz, A.Ortiz, InmaculadaRangel, C. M.2022-01-07T16:24:25Z2021-05-01T00:00:00Z2021-05-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.9/3679engTeixeira, Fátima C... [et.al.] - New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance. In: International Journal of Hydrogen Energy, 2021, Vol. 46, p. 17562-175710360-319910.1016/j.ijhydene.2020.01.2121879-3487info: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:RCAAP2022-09-06T12:29:24Zoai:repositorio.lneg.pt:10400.9/3679Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:36:53.646379Repositório 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 |
New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance |
title |
New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance |
spellingShingle |
New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance Teixeira, Fatima Fuel cells Proton exchange membrane Polymer electrolyte membrane Nafion Bisphosphonates |
title_short |
New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance |
title_full |
New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance |
title_fullStr |
New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance |
title_full_unstemmed |
New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance |
title_sort |
New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance |
author |
Teixeira, Fatima |
author_facet |
Teixeira, Fatima de Sá, A.I. Teixeira, António P. S. Ortiz-Martínez, V. M. Ortiz, A. Ortiz, Inmaculada Rangel, C. M. |
author_role |
author |
author2 |
de Sá, A.I. Teixeira, António P. S. Ortiz-Martínez, V. M. Ortiz, A. Ortiz, Inmaculada Rangel, C. M. |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Repositório do LNEG |
dc.contributor.author.fl_str_mv |
Teixeira, Fatima de Sá, A.I. Teixeira, António P. S. Ortiz-Martínez, V. M. Ortiz, A. Ortiz, Inmaculada Rangel, C. M. |
dc.subject.por.fl_str_mv |
Fuel cells Proton exchange membrane Polymer electrolyte membrane Nafion Bisphosphonates |
topic |
Fuel cells Proton exchange membrane Polymer electrolyte membrane Nafion Bisphosphonates |
description |
ABSTRACT: Proton exchange membranes remain a crucial material and a key challenge to fuel cell science and technology. In this work, new Nafion membranes are prepared by a casting method using aryl- or azaheteroaromatic bisphosphonate compounds as dopants. The incorporation of the dopant, considered at 1 wt% loading after previous selection, produces enhanced proton conductivity properties in the new membranes, at different temperature and relative humidity conditions, in comparison with values obtained with commercial Nafion. Water uptake and ionic exchange capacity (IEC) are also assessed due to their associated impact on transport properties, resulting in superior values than Nafion when tested in the same experimental conditions. These improvements by doped membranes prompted the evaluation of their potential application in fuel cells, at different temperatures. The new membranes, in membrane-electrode assemblies (MEAs), show an increased fuel cell maximum power output with temperature until 60 degrees C or 70 degrees C, followed by a decrease above these temperatures, a Nafion-like behaviour when measured in the same conditions. The membrane doped with [1,4-phenylenebis(hydroxymethanetriyl)] tetrakis(phosphonic acid) (BP2) presents better results than Nafion N-115 membrane at all studied temperatures, with a maximum power output performance of similar to 383 mW cm(-2) at 70 degrees C. Open circuit potentials of the fuel cell were always higher than values obtained for Nafion MEAs in all studied conditions, indicating the possibility of advantageous restrain to gas crossover in the new doped membranes. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-05-01T00:00:00Z 2021-05-01T00:00:00Z 2022-01-07T16:24:25Z |
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/10400.9/3679 |
url |
http://hdl.handle.net/10400.9/3679 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Teixeira, Fátima C... [et.al.] - New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance. In: International Journal of Hydrogen Energy, 2021, Vol. 46, p. 17562-17571 0360-3199 10.1016/j.ijhydene.2020.01.212 1879-3487 |
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) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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