Polarity reversal by fuel starvation in PEM Fuel Cells

Detalhes bibliográficos
Autor(a) principal: Travassos, Maria Antónia
Data de Publicação: 2011
Outros Autores: Rangel, C. M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.9/1423
Resumo: In this work, the degradation caused by polarity reversal by fuel starvation of a 16 MEA (membrane-electrode assembly) – low power PEM fuel cell is reported. Measuring of the potential of individual cells, while on load, was found instrumental in the location of affected cells which revealed very low or even negative potential. Ex-situ analysis of MEA, after irreversible degradation by fuel starvation, gave as a result delamination of catalyst layers with impacts on fuel cell performance such as development of flooded areas (in the created gaps by membrane separation) increasing the resistance of reactant transport to the catalyst sites. Striking thickness variations of the anode layers as well as carbon corrosion were found. Also, the proton exchange membrane was found to be affected by fluoride depletion.
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spelling Polarity reversal by fuel starvation in PEM Fuel CellsPolarity reversalFuel starvationPEM degradationIn this work, the degradation caused by polarity reversal by fuel starvation of a 16 MEA (membrane-electrode assembly) – low power PEM fuel cell is reported. Measuring of the potential of individual cells, while on load, was found instrumental in the location of affected cells which revealed very low or even negative potential. Ex-situ analysis of MEA, after irreversible degradation by fuel starvation, gave as a result delamination of catalyst layers with impacts on fuel cell performance such as development of flooded areas (in the created gaps by membrane separation) increasing the resistance of reactant transport to the catalyst sites. Striking thickness variations of the anode layers as well as carbon corrosion were found. Also, the proton exchange membrane was found to be affected by fluoride depletion.Repositório do LNEGTravassos, Maria AntóniaRangel, C. M.2012-02-01T15:24:39Z2011-01-01T00:00:00Z2011-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.9/1423engTravassos, M. A.; Rangel, C. M. Polarity reversal by fuel starvation in PEM Fuel Cells. In: Ciência e Tecnologia dos Materiais, 2011, vol. 23, nº 1-2, p. 25-29info: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:RCAAP2022-09-06T12:25:58Zoai:repositorio.lneg.pt:10400.9/1423Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:34:15.383169Repositório 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 Polarity reversal by fuel starvation in PEM Fuel Cells
title Polarity reversal by fuel starvation in PEM Fuel Cells
spellingShingle Polarity reversal by fuel starvation in PEM Fuel Cells
Travassos, Maria Antónia
Polarity reversal
Fuel starvation
PEM degradation
title_short Polarity reversal by fuel starvation in PEM Fuel Cells
title_full Polarity reversal by fuel starvation in PEM Fuel Cells
title_fullStr Polarity reversal by fuel starvation in PEM Fuel Cells
title_full_unstemmed Polarity reversal by fuel starvation in PEM Fuel Cells
title_sort Polarity reversal by fuel starvation in PEM Fuel Cells
author Travassos, Maria Antónia
author_facet Travassos, Maria Antónia
Rangel, C. M.
author_role author
author2 Rangel, C. M.
author2_role author
dc.contributor.none.fl_str_mv Repositório do LNEG
dc.contributor.author.fl_str_mv Travassos, Maria Antónia
Rangel, C. M.
dc.subject.por.fl_str_mv Polarity reversal
Fuel starvation
PEM degradation
topic Polarity reversal
Fuel starvation
PEM degradation
description In this work, the degradation caused by polarity reversal by fuel starvation of a 16 MEA (membrane-electrode assembly) – low power PEM fuel cell is reported. Measuring of the potential of individual cells, while on load, was found instrumental in the location of affected cells which revealed very low or even negative potential. Ex-situ analysis of MEA, after irreversible degradation by fuel starvation, gave as a result delamination of catalyst layers with impacts on fuel cell performance such as development of flooded areas (in the created gaps by membrane separation) increasing the resistance of reactant transport to the catalyst sites. Striking thickness variations of the anode layers as well as carbon corrosion were found. Also, the proton exchange membrane was found to be affected by fluoride depletion.
publishDate 2011
dc.date.none.fl_str_mv 2011-01-01T00:00:00Z
2011-01-01T00:00:00Z
2012-02-01T15:24:39Z
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/10400.9/1423
url http://hdl.handle.net/10400.9/1423
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Travassos, M. A.; Rangel, C. M. Polarity reversal by fuel starvation in PEM Fuel Cells. In: Ciência e Tecnologia dos Materiais, 2011, vol. 23, nº 1-2, p. 25-29
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.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
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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