Non-aqueous liquid compositions comprising ion exchange polymers
View Patent ↗Compositions, and methods of making thereof, comprising from about 1% to about 5% of a perfluorinated sulfonic acid ionomer or a hydrocarbon-based ionomer; and from about 95% to about 99% of a solvent, said solvent consisting essentially of a polyol; wherein said composition is substantially free of water and wherein said ionomer is uniformly dispersed in said solvent.
1. A composition consisting of:
a) from about 1% to about 5% by weight of a hydrocarbon-based ionomer;
b) from about 95% to about 99% by weight of a polyol solvent; and
c) an electrocatalyst;
wherein said composition is substantially free of water and wherein said ionomer is uniformly dispersed in said solvent.
2. The composition of claim 1 , wherein said polyol is selected from the group consisting of glycerol, ethylene glycol, propylene glycol, a butanediol, a butanetriol, a pentanetriol, a hexanetriol, and combinations thereof.
3. The composition of claim 1 , wherein said polyol is one of glycerol, ethylene glycol, propylene glycol, a butanediol, a butanetriol, a pentanetriol, or a hexanetriol.
4. The composition of claim 1 , wherein said hydrocarbon-based ionomer is selected from the group consisting of sulfonated poly(arylene ether sulfone), sulfonated poly(arylene ether ketone), sulfonated poly(arylene ether nitrile), sulfonated polyphenylene, sulfonated polyimide, and combinations thereof.
5. The composition of claim 1 , wherein the hydrocarbon-based ionomer is a salt, wherein the cation of the salt is selected from the group consisting of sodium, potassium, lithium, iron, cesium, magnesium, cesium, tetrabutyl ammonium, tetramethyl ammonium, tetrapropyl ammonium, tetraethyl ammonium, and combinations thereof.
6. The composition of claim 1 , wherein the hydrocarbon-based ionomer is protonated.
7. The composition of claim 1 , wherein the hydrocarbon-based ionomer has an equivalent weight of 1600 or less.
8. The composition of claim 1 , wherein the electrocatalyst is platinum or platinum on carbon.
9. A method of making a polymer dispersion suitable for use in a fuel cell, consisting of:
a) providing a composition consisting of from about 1% to about 5% by weight of a hydrocarbon-based ionomer, from about 95% to about 99% by weight of a polyol solvent, an electrocatalyst, and optionally, an inorganic base, wherein said composition is substantially free of water and wherein said ionomer is uniformly dispersed in said solvent; and,
b) heating the composition to a temperature of from about 140° C. to about 290° C. at ambient pressure for a period of 3 hours or less.
10. The method of claim 9 , wherein the polyol is selected from the group consisting of glycerol, ethylene glycol, propylene glycol, a butanediol, a butanetriol, a pentanetriol, a hexanetriol, and combinations thereof.
11. The method of claim 9 wherein said polyol is one of glycerol, ethylene glycol, propylene glycol, a butanediol, a butanetriol, a pentanetriol, or a hexanetriol.
12. The composition of claim 9 , wherein the inorganic base is tetrabutyl ammonium hydroxide.
13. The method of claim 9 , wherein the temperature is from about 140° C. to about 210° C.
14. The method of claim 9 , wherein the electrocatalyst is platinum or platinum on carbon.