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The influence of metal ions on the conductivity of Nafion 112 in polymer electrolyte membrane fuel cell

โœ Scribed by Heli Wang; John A. Turner

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
891 KB
Volume
183
Category
Article
ISSN
0378-7753

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โœฆ Synopsis

Nafion 112 membranes were soaked in 1 M H 2 SO 4 solutions containing variable amounts of Fe and Cr ions, either individually or mixed. An even distribution of the metal ions on the surface of the membranes was observed with electron probe microanalysis (EPMA) mapping. The proton conductivity of the soaked membranes was investigated using a conductivity cell. For Fe ions, the conductivity was almost constant until the Fe-ion solution concentration reached 300 ppm. Over the 300-ppm threshold, the conductivity decreased significantly. Similar results were obtained with Cr ions in the membrane, but here the threshold was approximately 200 ppm in the solution. Mixed metal ions were found to decrease these threshold values due to the additive effect of the two metals.

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