Development of membrane materials for direct methanol fuel cells

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Chapter 4 Nafion®/H-ZSM-5 composite membranes with superior performance for DMFCs centration. The decreased permeability is the result of a reduction in pene- trant solubility due to (i) the replacement of polymer through which trans- port may occur with filler particles and (ii) an increase in tortuosity of the diffusion film [23]. path through which the penetrant molecules cross the polymeric -6 3.5x10 -6 3.0x10 2.5x10-6 -6 2.0x10 -6 1.5x10 1.0x10-6 -6 3.5x10 -6 3.0x10 -6 2.5x10 2.0x10-6 1.5x10-6 -6 0123456 Zeolite content [wt.%] -6 3.5x10 -6 3.0x10 -6 2.5x10 2.0x10-6 1.5x10-6 -6 1.0x10 1.0x10 0123456 0123456 Zeolite content [wt.%] Zeolite content [wt.%] b) Simple Maxwell DEZ25 a) c) SimpleMaxwell Figure 7. Methanol permeabilities of DE2020 and DEZ membranes as a function of zeolite content. The dashed line represents the prediction of simple Maxwell model. Figure 7b, 7c compares the experimental permeability results of two of the composite membranes (DEZ25 and DEZ50) with the theoretical prediction of a simple Maxwell model. The simple Maxwell model obviously fails to predict the experimental results, which are much lower than this predic- 64 DEZ25 DEZ50 DEZ75 DEZ100 DE2020 DEZ50 Methanol permeability [cm2/s] Methanol permeability [cm2/s] Methanol permeability [cm2/s]

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