Abstract
The electro-osmotic drag coefficient of water in two polymer electrolytes was experimentally determined as a function of water vapor activity and current density for temperatures up to 200 °C. The results show that the electro-osmotic drag coefficient varies from 0.2 to 0.6 in Nafion®/H3PO4 membrane electrolyte, but is essentially zero in a phosphoric acid doped PBI (polybenzimidazole) membrane electrolyte over the range of water vapor activity considered. The near zero electro-osmotic drag coefficient found in PBI indicates that this electrolyte should lessen the problems associated with water redistribution in PEM fuel cells.
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