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Chapter 4 Nafion®/H-ZSM-5 composite membranes with superior performance for DMFCs ⎛ Weight − Weight SD(%)=⎜ wet ⎞ dry ⎟.100, (1) ⎠ Methanol permeability ⎝ Weightdry The methanol permeability, P [cm2/s], at 25°C was measured using a two compartment diffusion cell following the procedure described elsewhere [18]. Proton conductivity Proton conductivity measurements were carried out at 25oC and 100% relative humidity, in cells with two-probe configuration following the procedure described elsewhere [22]. Prior to all experiments, membranes were equilibrated in ultra pure water for 24h. 2.5. Fabrication of membrane-electrode assemblies E-TEK commercial electrodes were used to fabricate the membrane- electrode assemblies (MEAs). Both anode (Pt-Ru) and cathode (Pt) contain 5mg/cm2 of catalyst. The geometric area of each electrode was 6.25cm2. The MEAs were prepared by hot pressing of the anode and cathode on both sides of the membrane at 10 bar for 5 minutes at 125°C. 2.6. Single cell DMFC performance The DMFC performance of the MEAs was evaluated following the procedure described elsewhere [18]. 3. Results and discussion 3.1. Characterization of the H-ZSM-5 zeolites As shown in Fig. 1, independent from the Al concentration in the mother sol, well crystallized seeds with XRD patterns consistent with the MFI reference, were obtained after only 1h synthesis at 160°C. 57PDF Image | Development of membrane materials for direct methanol fuel cells
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