Sorption and transport properties of water in Nafion{reg_sign}/H{sub 3}PO{sub 4} polymer electrolyte at elevated temperatures
- Case Western Reserve Univ., Cleveland, OH (United States)
A major advantage of the Nafion{reg_sign}/H{sub 3}PO{sub 4} polymer electrolyte, formed by equilibrating Nafion{reg_sign} membranes with phosphoric acid, is that it retains high ionic conductivity at temperatures exceeding 100 C. Thermodynamic and transport properties of the system, including water sorption, solubility, diffusivity, permeability, electro-osmotic drag coefficient and ionic conductivity were determined as a function of water activity and temperatures up to 200 C. Results indicate that the water sorption increases with increasing water vapor activity. The electro-osmotic drag coefficient varies from 0.2 to 0.6 over the range of water vapor activity considered. Reasonably high conductivity (> 0.05 {Omega}{sup {minus}1} cm{sup {minus}1}) is observed at the elevated temperatures. Consequently, the Nafion{reg_sign}/H{sub 3}PO{sub 4} system is promising for high temperature PEM fuel cells applications.
- OSTI ID:
- 33597
- Report Number(s):
- CONF-940529-; ISBN 1-56677-080-7; TRN: IM9518%%417
- Resource Relation:
- Conference: 185. Electrochemical Society meeting, San Francisco, CA (United States), 22-27 May 1994; Other Information: PBD: 1994; Related Information: Is Part Of Electrode materials and processes for energy conversion and storage. Proceedings Volume 94-23; Srinivasan, S. [ed.] [Texas A and M Univ., College Station, TX (United States). Energy Research Center]; Macdonald, D.D. [ed.] [Pennsylvania State Univ., University Park, PA (United States)]; Khandkar, A.C. [ed.] [Ceramatec, Salt Lake City, UT (United States)]; PB: 517 p.
- Country of Publication:
- United States
- Language:
- English
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