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Summary In Chapter 3, ‘Impregnated membranes for direct methanol fuel cells at high methanol concentrations’, Sulfonated poly(phthalazinone ether ke- tone) (SPPEK) impregnated Solupor®, microporous film, (SPPEK-PE) and pure SPPEK membranes with two different ion-exchange capacities (IECs), were prepared and characterized. Impregnating SPPEK into PE decreases swelling degree, methanol permeability and proton conductivity of the membranes.. Unlike perfluorinated membranes, SPPEK-PE shows an increase in its DMFC performance at high methanol concentration and that makes it more attractive for mobile DMFC applications where high methanol concentrations are needed to compete with Li-Ion batteries. In the second part of this thesis (Chapter 4 and 5) we focus on modification of commercially available Nafion membranes (N117) and in house made so- lution cast Nafion membranes (DE2020). In Chapter 4, ‘Nafion®/H-ZSM-5 composite membranes with superior performance for direct methanol fuel cells, solution cast composite di- rect methanol fuel cell membranes (DEZ) based on DE2020 Nafion® disper- sion and in house prepared H-ZSM-5 zeolites with different Si/Al ratios were investigated. All composite membranes have indeed lower methanol permeability and higher proton conductivity than pure DE2020 membrane. The composite membranes with Si/Al ratio 25 and 5wt.% of zeolites (DEZ25-5) having the lowest methanol permeability and the membrane with Si/Al ratio 50 and 1wt.% of zeolites (DEZ50-1) having the highest proton conductivity are tested in the direct methanol fuel cell (DMFC) for several days. The DEZ25-5 membrane has the best performance; namely high power density and stable performance in time with low fluctuations. In Chapter 5, ‘Micro-structured Nafion membranes for direct methanol fuel cell applications’, Nafion®117 (N117), heat and pressure treated (hp) N117 and micro-structured (μs) N117 membranes (prepared by hot emboss- ing) are thoroughly characterized with respect to their swelling degree, methanol flux, membrane resistance and DMFC performance. Heat and pressure treatment during hot embossing probably makes the membrane structure more compact. This inhibits infiltration of water and methanol into the hydrophobic polymer zones harder and leads to decrease in water content and methanol flux for both hp N117 and μs N117 membranes. 94PDF Image | Development of membrane materials for direct methanol fuel cells
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