Abstract
Measurements of the electro-osmotic drag coefficient for Nafion® and both random and multi-block co-polymer sulfonated poly(arylene ether sulfone) (BPSH) chemistries are reported for vapor equilibrated samples below 0 °C. No significant change in the drag coefficient behavior for Nafion from that reported above 0 °C is found. However BPSH is found to have a drag coefficient of 0.4. The implication of a drag coefficient less than unity in the interpretation of conduction mechanisms is discussed. Measurements of water sorption isotherms below 0 °C are also presented. A significant reduction in the capacity of polymer electrolytes to store water below 0 °C is found. This reduced water content is a result of the lower vapor pressure of ice compared to supercooled liquid.
Original language | American English |
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Pages (from-to) | 297-307 |
Number of pages | 11 |
Journal | ECS Transactions |
Volume | 16 |
Issue number | 2 |
DOIs | |
State | Published - 2009 |
Event | Proton Exchange Membrane Fuel Cells 8, PEMFC - 214th ECS Meeting - Honolulu, HI, United States Duration: 12 Oct 2008 → 17 Oct 2008 |
NREL Publication Number
- NREL/JA-560-45845
Keywords
- fuel cells