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Chapter 4 Nafion®/H-ZSM-5 composite membranes with superior performance for DMFCs Chapter 4 Nafion®/H-ZSM-5 composite membranes with superior performance for direct methanol fuel cells M. Hakan Yildirim, Anna Roca Curòs, Julius Motuzas, Anne Julbe, Dimitris Stamatialis, Matthias Wessling Abstract Solution cast composite direct methanol fuel cell membranes (DEZ) based on DE2020 Nafion® dispersion and in house prepared H-ZSM-5 zeolites with different Si/Al ratios were prepared to increase the proton conductivity and decrease the methanol cross-over at the same time. 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. At the end of the 5th day it seems that DEZ25-5 has the best performance namely high power density and stable performance in time with low fluctuations. Yildirim, M.H. et al. J. Membr. Sci., submitted for publication. 53PDF Image | Development of membrane materials for direct methanol fuel cells
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