Methods for producing liquid composition, polymer electrolyte membrane, catalyst layer, and membrane/electrode assembly
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United States of America Patent
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Nov 8, 2022
Grant Date -
Jan 11, 2018
app pub date -
Sep 25, 2017
filing date -
Apr 6, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A method for producing a liquid composition containing a fluoropolymer having sulfonic acid groups, trivalent cerium ions and water, by (1) irradiating a solution containing at least one cerium compound selected from cerium carbonate, cerium hydroxide and cerium oxide, the fluoropolymer and the water, with light at least partially in a wavelength region from 300 to 400 nm so that the ultraviolet irradiance on the surface of the solution is at least 0.1 mW/cm2 or (2) adding a reducing agent to a solution containing at least one cerium compound selected from cerium carbonate, cerium hydroxide and cerium oxide, the fluoropolymer and the water.
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