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Chapter 5 Micro-structured Nafion membranes for DMFC applications Chapter 5 Micro-structured Nafion membranes for DMFC applications M. Hakan Yildirim, Joost te Braake, H. Can Aran, Dimitris Stamatialis, Matthias Wessling Abstract In this work, Nafion®117 (N117), heat and pressure treated (hp) N117 and micro-structured (μs) N117 membranes (prepared by hot embossing) 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 the hp N117 and μs N117 membranes. Nonetheless, all three membranes have similar resistances. The densification of the structure may facilitate transport of H+ through the membrane due to decrease of tortuosity. In the DMFC, the hp N117 has similar performance with normal N117 membrane despite its low methanol crossover. The μs N117, however, has better performance than normal N117 probably due to better catalyst utilization due to microstructure. In DMFC stacks, which contain multiple MEAs, this can lead to a higher power output gain and/or lower system volume. 73PDF Image | Development of membrane materials for direct methanol fuel cells
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