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Chapter 5 Micro-structured Nafion membranes for DMFC applications Swelling degree (SD) Membranes were dried in the vacuum oven at 30°C for 1 day and then im- mersed in ultra pure water. The weight of wet (Weightwet) and dry (Weightdry) samples were measured. The SD of the membrane was calculated using: ⎛ Weight − Weight SD(%)=⎜ wet ⎞ dry ⎟.100, (1) ⎠ Methanol flux ⎝ Weightdry Methanol flux, F [mol.cm-2.min-1], at 25°C was measured using a two compartment diffusion cell following the procedure described elsewhere [13]. Membrane resistance Membrane resistance measurements were carried out at 25oC and 100% relative humidity, in cells with two-probe configuration following the procedure described elsewhere [20]. 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 and cathode contain 5mg/cm2 Pt- Ru and Pt, respectively. 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 2 bars for 5 minutes at 125°C. Comparing to our previous work [13], where MEAs were prepared at 10bar, the MEAs at this study were prepared at low pressure (2bar) to avoid damage at the micro- structure during MEA preparation. 2.6. Single cell DMFC performance The performance of the MEAs was evaluated following the procedure described elsewhere [13]. 76PDF Image | Development of membrane materials for direct methanol fuel cells
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