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Mass transport in proton conducting membranes for the direct methanol fuel cell
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , 25 p.
Series
Trita-KET, ISSN 1104-3466 ; 214
Keyword [en]
Chemical engineering
Keyword [sv]
Kemiteknik
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-309OAI: oai:DiVA.org:kth-309DiVA: diva2:8843
Presentation
2005-07-13, 15:00
Supervisors
Note
QC 20110104Available from: 2005-07-15 Created: 2005-07-15 Last updated: 2011-01-04Bibliographically approved
List of papers
1. A model for mass transport in the electrolyte membrane of a DMFC
Open this publication in new window or tab >>A model for mass transport in the electrolyte membrane of a DMFC
2007 (English)In: Journal of Applied Electrochemistry, ISSN 0021-891X, E-ISSN 1572-8838, Vol. 37, no 4, 429-438 p.Article in journal (Refereed) Published
Abstract [en]

A steady state model for multicomponent mass transport was derived for the direct methanol fuel cell membrane. Data for development and validation of the model was taken both from experiments and literature. The experimental data was collected in a polarisation cell, where mass transport of methanol across the electrolyte membrane was measured through a potentiostatic method. The results from modelling and experiments showed good agreement. The model was capable of describing the non-linear response in mass transport to increased methanol feed concentration. The model also accurately described the change in membrane conductivity with methanol concentration. From the model transport equations, it was also possible to derive some characteristic transport parameters, namely the electro osmotic drag of both water and methanol, diffusive drag of water and methanol, and effective, concentration dependent, diffusion coefficients for methanol and water.

Keyword
direct methanol fuel cell, modelling, mass transport, methanol crossover, electrolyte membrane, methanol fuel-cell, proton-exchange membranes, open-circuit voltage, nafion membranes, diffusion-coefficient, ionomeric membranes, electroosmotic drag, water-uptake, performance, crossover
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-16433 (URN)10.1007/s10800-006-9257-1 (DOI)000244689100003 ()2-s2.0-33847721423 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-01-04Bibliographically approved
2. A sulfophenylated polysulfone as the DMFC electrolyte membrane - an evaluation of methanol permeability and cell performance
Open this publication in new window or tab >>A sulfophenylated polysulfone as the DMFC electrolyte membrane - an evaluation of methanol permeability and cell performance
2006 (English)In: Fuel Cells, ISSN 1615-6846, E-ISSN 1615-6854, Vol. 6, no 5, 340-346 p.Article in journal (Refereed) Published
Abstract [en]

A sulfophenylated polysulfone (PSU-sph), carrying 0.8 sulfonic acid units per repeating unit of the polymer, is evaluated as a membrane electrolyte for DMFC applications. The liquid uptake, methanol transport characteristics, electrolyte conductivity, and fuel cell performance are investigated. The methanol transport and DMFC performance results are compared to those of Nafion(R) 117. The PSU-sph membrane investigated shows superior qualities with regard to methanol crossover, with a methanol permeability of approximately 25% compared to that of Nafion(R). The conductivity measured to be 15% compared to that of Nafion(R). However, this could not fully account for the internal resistance of the cell, implying that the contact resistance between the electrodes and electrolyte is higher when PSU-sph is used, probably because the electrodes are developed for use with Nafion(R) membranes. The stability of the PSU-sph membrane seems promising, with very low degradation observed over a period of 72 hours. It was concluded that although the mass transport properties of the PSU-sph membrane sample investigated were superior, it could not match the performance of Nafion(R) 117 in a DMFC application. However, a higher degree of sulfonation may have a significant positive effect on cell performance. The results also showed that a fully intergrated MEA is needed to fully assess new membrane materials.

Keyword
conductivity, direct methanol fuel cell, mass transport, methanol permeability, polymer electrolyte membrane, conducting polymer membranes, ether ketone) membranes, fuel-cell, nafion membranes, water-uptake, composite membranes, ionomer membranes, proton, transport, crossover
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-16112 (URN)10.1002/fuce.200500231 (DOI)000241801000004 ()2-s2.0-33750588591 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-01-04Bibliographically approved

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