Electro-osmotic drag coefficient of water and methanol in polymer electrolytes at elevated temperatures

Journal Article · Mon Apr 01 00:00:00 EST 1996 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1836626· OSTI ID:251057

Weng, D; Wainright, J S; Landau, U; Savinell, R F ^[1]

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1. Case Western Reserve Univ., Cleveland, OH (United States)

The electro-osmotic drag coefficient of water in two polymer electrolytes was experimentally determined as a function of water 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{reg_sign}/H{sub 3}PO{sub 4} membrane electrolyte, but is essentially zero in phosphoric acid-doped PBI (polybenzimidazole) membrane electrolyte over the range of water 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 proton exchange membrane fuel cells.

• Sponsoring Organization: USDOE
• OSTI ID: 251057
• Journal Information: Journal of the Electrochemical Society, Vol. 143, Issue 4; Other Information: PBD: Apr 1996
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
SOLID ELECTROLYTE FUEL CELLS
SOLID ELECTROLYTES
ALCOHOL FUEL CELLS
ORGANIC POLYMERS
PERMEABILITY
BENZIMIDAZOLES
WATER
METHANOL
PERFORMANCE
STABILITY
COMPARATIVE EVALUATIONS
OSMOSIS
MEMBRANE TRANSPORT