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Pore Size Distribution and Water Uptake in Hydrocarbon and Perfluorinated Proton-Exchange Membranes as Studied by NMR Cryoporometry
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry. (Tillämpad elektrokemi)
KTH, School of Chemical Science and Engineering (CHE), Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.ORCID iD: 0000-0001-9203-9313
KTH, School of Chemical Science and Engineering (CHE), Chemistry.ORCID iD: 0000-0002-0231-3970
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2008 (English)In: Fuel Cells, ISSN 1615-6846, E-ISSN 1615-6854, Vol. 8, no 3-4, 262-269 p.Article in journal (Refereed) Published
Abstract [en]

Sulfonated polysulfone (sPSU) membranes were analysed by nuclear magnetic resonance (NMR) cryoporometry, conventional gravimetric water uptake measurements as well as by differential scanning calorimetry (DSC). NMR cryoporometry is based on the relation between the pore size and the melting point depression of the pore-filling liquid, i.e. water in fuel cell membranes; thus providing a relation between the amount of molten water and the temperature shift, i.e. the pore size, in hydrated membranes. An sPSU membrane with high ion-exchange capacity (IEC 1.45 mequiv. g –1) possessed a significant amount of large pores after hydrothermal pretreatment at 80

Place, publisher, year, edition, pages
2008. Vol. 8, no 3-4, 262-269 p.
Keyword [en]
Differential Scanning Calorimetry, Nafion, Nuclear Magnetic Resonance Cryoporometry, ProtonExchange Membrane Fuel Cell, PEMFC, Sulfonated Polysulfone, Water Domain Size, Water Uptake
National Category
Chemical Engineering
URN: urn:nbn:se:kth:diva-9165DOI: 10.1002/fuce.200800010ISI: 000258086400013ScopusID: 2-s2.0-55349126100OAI: diva2:25472
MISTRAs bränslecellsprogram
QC 20100921Available from: 2008-10-13 Created: 2008-09-29 Last updated: 2012-03-21Bibliographically approved
In thesis
1. Membrane Electrode Assemblies Based on Hydrocarbon Ionomers and New Catalyst Supports for PEM Fuel Cells
Open this publication in new window or tab >>Membrane Electrode Assemblies Based on Hydrocarbon Ionomers and New Catalyst Supports for PEM Fuel Cells
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The proton exchange membrane fuel cell (PEMFC) is a potential electrochemicalpower device for vehicles, auxiliary power units and small-scale power plants. In themembrane electrode assembly (MEA), which is the core of the PEMFC single cell,oxygen in air and hydrogen electrochemically react on separate sides of a membraneand electrical energy is generated. The main challenges of the technology are associatedwith cost and lifetime. To meet these demands, firstly, the component expensesought to be reduced. Secondly, enabling system operation at elevated temperatures,i.e. up to 120 °C, would decrease the complexity of the system and subsequentlyresult in decreased system cost. These aspects and the demand for sufficientlifetime are the strong motives for development of new materials in the field.In this thesis, MEAs based on alternative materials are investigatedwith focus on hydrocarbon proton-conducting polymers, i.e. ionomers, and newcatalyst supports. The materials are evaluated by electrochemical methods, such ascyclic voltammetry, polarisation and impedance measurements; morphological studiesare also undertaken. The choice of ionomers, used in the porous electrodes andmembrane, is crucial in the development of high-performing stable MEAs for dynamicoperating conditions. The MEAs are optimised in terms of electrode compositionand preparation, as these parameters influence the electrode structure andthus the MEA performance. The successfully developed MEAs, based on the hydrocarbonionomer sulfonated polysulfone (sPSU), show promising fuel cell performancein a wide temperature range. Yet, these membranes induce mass-transportlimitations in the electrodes, resulting in deteriorated MEA performance. Further,the structure of the hydrated membranes is examined by nuclear magnetic resonancecryoporometry, revealing a relation between water domain size distributionand mechanical stability of the sPSU membranes. The sPSU electrodes possessproperties similar to those of the Nafion electrode, resulting in high fuel cell performancewhen combined with a high-performing membrane. Also, new catalystsupports are investigated; composite electrodes, in which deposition of platinum(Pt) onto titanium dioxide reduces the direct contact between Pt and carbon, showpromising performance and ex-situ stability. Use of graphitised carbon as catalystsupport improves the electrode stability as revealed by a fuel cell degradation study.The thesis reveals the importance of a precise MEA developmentstrategy, involving a broad methodology for investigating new materials both as integratedMEAs and as separate components. As the MEA components and processesinteract, a holistic approach is required to enable successful design of newMEAs and ultimately development of high-performing low-cost PEMFC systems.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. 69 p.
Trita-CHE-Report, ISSN 1654-1081 ; 2008:64
Catalyst support, Carbon, High Temperature Proton Exchange Membrane Fuel Cell, Hydrocarbon Ionomer, Membrane Electrode Assembly, Nafion, PEFC, PEMFC, Porous Electrode, Sulfonated Polysulfone, Titanium Dioxide
National Category
Chemical Engineering
urn:nbn:se:kth:diva-9208 (URN)978-91-7415-124-4 (ISBN)
Public defence
2008-10-24, F3, Lindstedtsvägen 26, Stockholm, 09:30 (English)
QC 20100922Available from: 2008-10-13 Created: 2008-10-03 Last updated: 2010-09-22Bibliographically approved

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