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A comparison of physical properties and fuel cell performance of Nafion and zirconium phosphate/Nafion composite membranes

✍ Scribed by Chris Yang; S. Srinivasan; A.B. Bocarsly; S. Tulyani; J.B. Benziger

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
467 KB
Volume
237
Category
Article
ISSN
0376-7388

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✦ Synopsis

The physiochemical properties of Nafion 115 and a composite Nafion 115/zirconium phosphate (∼25 wt.%) membranes are compared. The composite membrane takes up more water than Nafion at the same water activity. However, the proton conductivity of the composite membrane is slightly less than that for Nafion 115. Small angle X-ray scattering shows that the hydrophilic phase domains in the composite membrane are spaced further apart than in Nafion 115, and the composite membrane shows less restructuring with water uptake. Despite the lower proton conductivity of the composite membranes they display better fuel cell performance than Nafion 115 when the fuel cell is operated at reduced humidity conditions. It is suggested that the composite membrane has a greater rigidity that accounts for its improved fuel cell performance.

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