Recycling and regeneration of used perfluorosulfonic membranes for polymer electrolyte fuel cells |
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Authors: | H-F. Xu X. Wang Z-G. Shao I-M. Hsing |
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Affiliation: | (1) Department of Chemical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong |
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Abstract: | This paper describes a method for the recycling and regeneration of used perfluorosulfonic Nafion® (Dupont) membranes by dissolution and recasting. The dissolution of the used Nafion® membranes from polymer electrolyte fuel cells is realized using dimethyl sulfoxide as a solvent under atmospheric pressure and 190 °C. A mechanically robust membrane can be reproduced by a recast process of the dissolved Nafion® solution at 170 °C. The recycled membrane has shown a good crystalline structure and high mechanical strength. Membrane properties, including water uptake, exchange capacity and resistance are similar to that of the as-received Nafion® 115 membrane. Fuel cells prepared by the recycled membrane demonstrate a comparable performance to that of the fresh fuel cell. |
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Keywords: | dimethyl sulfoxide dissolution fuel cells Nafion® membrane recast |
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