Please use this identifier to cite or link to this item:
Full metadata record
DC FieldValueLanguage
dc.creatorVânia B. Oliveira
dc.creatorDaniela S. Falcão
dc.creatorCarmen M. Rangel
dc.creatorAlexandra M. F. R. Pinto
dc.description.abstractPassive direct methanol fuel cells (DMFCs) are under development for use in portable applications because of their enhanced energy density in comparison with other fuel cell types. The most significant obstacles for DMFC development are methanol and water crossover because methanol diffuses through the membrane generating heat but no power. The presence of a large amount of water floods the cathode and reduces cell performance. The present study was carried out to understand the performance of passive DMFCs, focused on the water crossover through the membrane from the anode to the cathode side. The water crossover behaviour in passive DMFCs was studied analytically with the results of a developed model for passive DMFCs. The model was validated with an in-house designed passive DMFC. The effect of methanol concentration, membrane thickness, gas diffusion layer material and thickness and catalyst loading on fuel cell performance and water crossover is presented. Water crossover was lowered with reduction on methanol concentration, reduction of membrane thickness and increase on anode diffusion layer thickness and anode and cathode catalyst layer thickness. It was found that these conditions also reduced methanol crossover rate. A membrane electrode assembly was proposed to achieve low methanol and water crossover and high power density, operating at high methanol concentrations. The results presented provide very useful and actual information for future passive DMFC systems using high concentration or pure methanol. Copyright (c) 2012 John Wiley & Sons, Ltd.
dc.relationinfo:eu-repo/grantAgreement/FCT - Fundação para a Ciência e a Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/POCTI/EQU/47054/2002/Fenómenos de Transporte em Células de Combustível com Alimentação Directa de Metanol: Modelização e Estudos Experimentais/POCTI/EQU/47054/2002
dc.relationinfo:eu-repo/grantAgreement/FCT - Fundação para a Ciência e a Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EQU-FTT/112475/2009/MICROPILHAS - Miniaturização de Células de Combustível de Metanol Directo: design, modelação e optimização/MICROPILHAS
dc.subjectCiências Tecnológicas, Ciências da engenharia e tecnologias
dc.subjectTechnological sciences, Engineering and technology
dc.titleWater management in a passive direct methanol fuel cell
dc.typeArtigo em Revista Científica Internacional
dc.contributor.uportoFaculdade de Engenharia
dc.subject.fosCiências da engenharia e tecnologias
dc.subject.fosEngineering and technology
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

Files in This Item:
File Description SizeFormat 
  Restricted Access
artigo original publicado1.32 MBAdobe PDF    Request a copy from the Author(s)

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.